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... Hesperozygis ringens (Benth.) Epling (Lamiaceae) is a strongly aromatic plant employed popularly for its antiparasitic properties. The leaves afforded 4% of essential oil constituted mainly by pulegone (86%). Laboratory tests were carried out to determine the toxicity of the essential oil species on engorged females and larvae of the cattle tick Riphicephalus (Boophilus) microplus using the adult ...
... In order to use sugarcane bagasse as a substrate for lactic acid production, optimum conditions for acid hydrolysis of the bagasse were investigated. After lignin extraction, the conditions were varied in terms of hydrochloric (HCl) or sulfuric (H₂SO₄) concentration (0.5-5%, v/v), reaction time (1-5h) and incubation temperature (90-120°C). The maximum catalytic efficiency (E) was 10.85 under the c ...
dioxane; catalysts; high performance liquid chromatography; hydrochloric acid; gel chromatography; solvents; montmorillonite; acid hydrolysis; mass spectrometry; lignin
Abstract:
... The use of heterogeneous conditions involving Montmorillonite K10 clay was investigated as a mild alternative to homogeneous acidolysis of a lignin model. Guaiacyl Dehydrogenation Oligomers (DHOs) synthesized by horseradish peroxidase were selected as starting material. Hydrolysis products were analyzed by gel permeation chromatography and by HPLC/mass spectrometry. Several experimental parameters ...
carbonates; carbon dioxide; polymers; chemical reactions; algae; alcoholic fermentation; carbonated beverages; food preservation; food processing; ethanol production; value added; biofuels; solvents; carbonation; chemical industry; beverage industry; supercritical fluid extraction
Abstract:
... Carbon dioxide (CO₂) from ethanol production facilities is increasing as more ethanol is produced for alternative transportation fuels. CO₂ produced from ethanol fermentation processes is of high purity and is nearly a saturated gas. Such highly-concentrated source of CO₂ is a potential candidate for capture and utilization by the CO₂ industry. Quantity, quality and capture of CO₂ from ethanol fer ...
Saccharum officinarum; sugarcane; sugarcane bagasse; adsorbents; pollutants; cadmium; lead; nickel; zinc; copper; heavy metals; metal ions; adsorption; wastewater treatment
Abstract:
... A new process for the xanthation of sugarcane (Saccharum officinarum) bagasse was investigated for the separation of cadmium, lead, nickel, zinc and copper from their aqueous solutions. Adsorption capacity of the charred xanthated sugarcane bagasse (CXSB) was found to be significantly more than the several biosorbents reported in the literatures. The modified material was characterized by FTIR and ...
... The effect of temperature on the equilibrium adsorption of methylene blue dye from aqueous solution using carbon nanotubes was investigated. The equilibrium adsorption data were analyzed using two widely applied isotherms: Langmuir and Freundlich. The results revealed that Langmuir isotherm fit the experimental results well. Kinetic analyses were conducted using pseudo-first and second-order model ...
Agave; adsorption; bagasse; chromium; ions; mass transfer; oat straw; physical models; porosity; solutes; surface area
Abstract:
... The objective of this research is to compare empirical (pseudo-first and pseudo-second order models) and diffusional models (film diffusion, film-pore-volume diffusion, and film-surface diffusion models) in predicting the adsorption kinetics of chromium(III) on water-washed agro-waste materials (sorghum straw, oats straw, and agave bagasse). Concentration decay curves can be predicted by using eit ...
... Low-cost activated carbon was prepared from Polygonum orientale Linn. (PL) by phosphoric acid activation. Its ability to adsorb Pb(II) ions from aqueous solutions was examined. Through SEM, XRD, BET, and FTIR analyses, the PL-activated carbon (PLAC) was found to have a porous structure with a surface area of about 1400m²/g. Carboxyl groups played an important role in the adsorption of Pb(II) throu ...
... The adsorption performance of chitosan (CS) hydrogel beads was investigated after multiwalled carbon nanotubes (MWCNTs) impregnation for the removal of congo red (CR) as an anionic dye. The study of the adsorption capacity of CS/CNT beads as a function of the CNT concentration indicated that 0.01% CNT impregnation was the most useful for enhancing the adsorption capacity. The sulfur (%) in the CS/ ...
... The effects of complexes on the adsorption of copper from citrate solutions using chitosan were investigated. Various copper to citrate ratios and solution pHs were used to determine the copper adsorption capacity on the chitosan and a mathematical model was developed to simulate the copper adsorption process. According to the model, the three parameters influencing the copper adsorption capacity ...
... The objective of the present work was to assess the performance of batch and fixed bed column systems, using humin in natura and immobilized on sodium silicate, respectively, for the adsorption of the principal trihalomethanes (THMs) found in water supply systems. Kinetically, adsorption of THMs by humin follows a pseudo-second order reaction, with more than 50% removal in the first 5min for all c ...
... In this study, the natural and modified rice husk were tested to remove Cd(II) ions from water. The modified rice husk was prepared by being treated with alkali. The results showed the Cd(II) adsorption capacity was 73.96, 125.94mg/g, respectively, for the natural and modified rice husk. The modified rice husk had faster kinetics and higher adsorption capacities than the natural rice husk, which c ...
... This study described the adsorption of chloramphenicol (CAP) in wastewater on the renewable bioresource of bamboo charcoal (BC). Results showed that CAP adsorption on BC (Ln qe =1.272 Ln Ce +1.971) and H₂SO₄ modified BC (Ln qe =1.851 Ln Ce +0.659) were very slight, and on NaOH modified BC was significantly increased (Ln qe =0.344 Ln Ce +6.490). The adsorbents were characterized by N₂ adsorption-de ...
... Microbial bioremediation has been well-demonstrated as an ecofriendly and cost-competitive strategy for elimination of xenobiotic and or anthropogenic compounds from the polluted environments. However, successful execution of these versatile bioremediation strategies requires a thorough understanding of factors governing the growth, metabolism, dynamics and functions of indigenous microbial commun ...
gel strength; macroalgae; fish culture; feeds; sulfates; biopolymers; galactose; regression analysis; physicochemical properties; response surface methodology; melting point; agar; Gracilaria; microwave treatment; fish feeding; gelation; Portugal
Abstract:
... Microwave-assisted extraction (MAE) of agar from Gracilaria vermiculophylla, produced in an integrated multitrophic aquaculture (IMTA) system, from Ria de Aveiro (northwestern Portugal), was tested and optimized using response surface methodology. The influence of the MAE operational parameters (extraction time, temperature, solvent volume and stirring speed) on the physical and chemical propertie ...
... To determine how polysaccharide production influences microalgal aggregate size, we stimulated polysaccharide production using existing methods (previously applied to cyanobacteria and plants). Cultures were treated with glyoxylate (0, 0.25, 0.5, 1.25mmol/L) to simulate nutrient stress and examined for 9days (approaching stationary phase on day 9) to assess: growth rate, polysaccharide production ...
... Pyrolysis of industrial fatty wastes (soybean soapstock, beef tallow, and poultry industry waste) was carried out in the absence of catalysts. In all cases, organic mixtures of hydrocarbons and oxygenated compounds were obtained. These mixtures were distilled and diesel-like fractions were isolated and characterized by GC-FID, GC-MS and FT-IR, showing the formation of olefins, paraffins, and some ...
... Activated sludge produced by wastewater treatment facilities are a sub-utilized by-product whose handling and disposal represent significant costs to these facilities. In this work, we introduced a simple and effective alkaline extraction technique that extracts up to 75% of the sludge's organic matter into a liquor containing potentially useful organic material (proteins, carbohydrates, etc.). Th ...
... A new reactor concept of allothermal cyclic multi-compartment fluidized bed steam biomass gasification is proposed and analyzed numerically. The concept combines space and time delocalization to approach an ideal allothermal gasifier. Thermochemical conversion of biomass in periodic time and space sequences of steam biomass gasification and char/biomass combustion is simulated in which the exother ...
... Torrefaction is a mild pyrolysis process (usually up to 300°C) that changes the chemical and physical properties of biomass. This process is a possible pre-treatment prior to further processes (transport, grinding, combustion, gasification, etc) to generate energy or biofuels. In this study, three eucalyptus wood species and bark were subjected to different torrefaction conditions to determine the ...
... Casing layer is one of the most important components of Agaricus spp. production and it directly affects mushroom productivity, size and mass. The aim of this study was to evaluate potential raw materials as a casing layer and their effect on Agaricus brasiliensis productivity. Raw materials from Brazil with potential use were selected and characterized, and the most promising ones were tested as ...
... The concept, design and performance analysis of a four-stage novel constructed wetland system (CWs) capable of enhanced and simultaneous removal of phosphorus (P) and organic matter (OM) from wastewaters is described. Alum sludge, a largely available by-product of drinking water facilities using aluminium salts as coagulant was used as the media. Under a hydraulic loading rate of 1.27m³/m² d and a ...
... The green alga Scenedesmus was investigated for its ability to remove nitrogen from anaerobic digestion effluent possessing high ammonium content and alkalinity in addition to its growth characteristics. Nitrate and ammonium were indistinguishable as a nitrogen source when the ammonium concentration was at normal cultivation levels. Ammonium up to 100ppm NH₄-N did not inhibit cell growth, but did ...
... The utilization of tannery sludge in agricultural areas can be an alternative for its disposal and recycling. Despite this procedure may cause the loss of nitrogen by ammonia volatilization, there is no information about this process in tropical soils. For two years a field experiment was carried out in Rolândia (Paraná State, Brazil), to evaluate the amount of NH₃ volatilization due to tannery ...
... Sawdust, an available and renewable biomass, was investigated as a novel ammonium biosorbent. Biosorption occurred over a pH range of 6-10, reached an equilibrium state within only 20min, and can be described by a pseudo-second-order model predicting a chemisorption process. Equilibrium data were very well represented by Langmuir isotherm and confirm monolayer coverage. FTIR analysis before and af ...
... Mangrove sediment, influenced by tidal cycles, switches between low-oxygen and non-oxygen conditions, and iron is abundant in it. Polycyclic aromatic hydrocarbon (PAH) contamination often occurs in mangrove wetlands. In the present paper, the effects of iron [Fe(III)] amendment on the biodegradation of four mixed PAHs, namely fluorene (Fl), phenanthrene (Phe), fluoranthene (Flua) and pyrene (Pyr), ...
... The anaerobic co-digestion of glycerol and wastewater derived from biodiesel manufacturing, in which COD was found to be 1054 and 428g/L, respectively, was studied in batch laboratory-scale reactors at mesophilic temperature (35°C). Glycerol was acidified with H₃PO₄ in order to recover the alkaline catalyst employed in the transesterification reaction (KOH) as agricultural fertiliser (potassium ph ...
... Anaerobic digestion of livestock wastes with carbon rich residues was studied. Swine manure and poultry litter were selected as livestock waste, and vegetable processing waste was selected as the rich carbon source. A Central Composite Design (CCD) and Response Surface Methodology (RSM) were employed in designing experiments and determine individual and interactive effects over methane production ...
... Anaerobic co-digestion of a mixture of animal by-products (ABP) from meat-processing industry and of sewage sludge was studied at 35°C for co-digesting such by-products in digesters at wastewater treatment plants. The three reactors were fed with ABP mixture and sewage sludge (1) in a ratio of 1:7 (v/v), (2) in the same ratio but with hygienization (70°C, 60min) and (3) in a ratio of 1:3 (v/v). Hy ...
... Four anaerobic fluidized bed reactors filled with activated carbon (R1), expanded clay (R2), glass beads (R3) and sand (R4) were tested for anaerobic degradation of LAS. All reactors were inoculated with sludge from a UASB reactor treating swine wastewater and were fed with a synthetic substrate supplemented with approximately 20mgl⁻¹ of LAS, on average. To 560mgl⁻¹ COD influent, the maximum COD a ...
... The present study was to investigate the effectiveness of using digested dairy manure as a nutrient supplement for cultivation of oil-rich green microalgae Chlorella sp. Different dilution multiples of 10, 15, 20, and 25 were applied to the digested manure and algal growth was compared in regard to growth rate, nutrient removal efficiency, and final algal fatty acids content and composition. Slowe ...
... Steam explosion, one potential commercial pretreatment method for lignocellulosic wastes, was used to improve methane production of bulrush. Steam exploded bulrush showed a higher methane yield than the raw sample. The effects of steam pressure, moisture content and residence time on the concentration of neutral detergent fiber (NDF) and methane yield were described using a second order polynomial ...
... Anaerobic digestion of brewery wastewater solids in the form of primary sludge was investigated for its potential as a source of energy (methane). We operated a low-rate (hydraulic retention time (HRT)=solids retention time (SRT)) continuously stirred anaerobic digester (CSAD) and a high-rate (SRT>HRT) anaerobic sequencing batch reactor (ASBR) in parallel for 250days. We found that high-rate anaer ...
... The potential benefits of enzymatic digestion of intact yeast cells on anaerobic digestion of Scotch whisky distillery spent wash and pot ale were investigated. Various yeast cell wall hydrolytic enzymes were studied based on their effect on dissolution of cell wall glucan and mannoprotein. The synergistic activity of beta-glucanase and protease showed greater than 90% yeast cell digestion at 37°C ...
... Biogas production from anaerobic digestion (AD) of specified risk materials (SRM) co-digested with cattle manure was assessed in a 3×2 factorial design. SRM replaced manure at 0 (control), 10% or 25% (w/w) as the substrate fed to six 2-L biodigesters maintained at 37°C or 55°C. Digesters were fed substrate (30gL⁻¹ total volatile solids) at 6-d intervals for 90d, with a retention time of 30d. Kerat ...
... Disposal of the vast amounts of tannery waste that are currently generated is a significant problem. Anaerobic treatment of different types of tannery waste (fleshings, skin trimmings and wastewater sludge) was investigated. The biochemical methane potential is the same at 37°C or 55°C and an assay of this was shown to be an appropriate screening tool with which to estimate the susceptibility of a ...
... This research was aimed at studying oxidation processes, coliform inactivation effectiveness and disinfection byproducts (DBPs) associated with the disinfection of anaerobic sanitary wastewater effluent with ozone applied at doses of 5.0, 8.0 and 10.0mg O₃ L⁻¹ for contact times of 5, 10 and 15min. The wastewater used in this research was generated by the wastewater treatment plant (WWTP), Universi ...
... Magnetic nanoparticles were prepared by coprecipitating Fe²⁺ and Fe³⁺ ions in a sodium hydroxide solution and used as support for lipase. The lipase-coated particles were applied in a reactive extraction process that allowed separation of the products formed during transesterification. Kinetics data for triolein and ethanol consumption during biodiesel (ethyl oleate) synthesis together with a ther ...
... A demulsifying strain (S-XJ-1) was isolated from petroleum-polluted soil and identified as Alcaligenes sp. It showed emulsion breaking ratio of 81.3% for W/O emulsion within 24h when the cell concentration was 500mg/L. Evolution of water droplets during the biological demulsification process was investigated using a Turbiscan stability analyzer and microphotography. Further investigation focused o ...
methane production; biogas; bioremediation; municipal solid waste; waste paper; cellulose; particle size; biodegradability; anaerobic digestion; cardboard; chemical oxygen demand
Abstract:
... Paper and cardboard stand for the major biodegradable organic fraction of most of municipal solid waste (MSW). This article aims at discussing the possible positive impact of a thin shredding of this fraction on its biodegradability under mesophilic anaerobic conditions, either for landfilling or for digestion in industrial reactors. For that purpose, BMP tests were performed on two types of paper ...
composting; composts; glass; heavy metals; municipal solid waste; organic matter; organic soils; soil amendments; streams; waste treatment
Abstract:
... Composting of the organic fraction of municipal solid waste (OFMSW) reduces the amount of biodegradable waste landfilled. However, the final product or compost used as organic soil amendment shows a large presence of improper materials and alarming concentrations of heavy metals. In this work, 30 samples of OFMSW before and after composting have been characterized to determine qualitatively and qu ...
... In this study, we assessed the catalytic effect of anthraquinone-2,6-disulfonate (AQDS) to enhance the reductive decolourisation of the azo dyes Reactive Red 2 and Congo Red in batch and continuous-flow experiments. While testing the anaerobic sludge 1 in assays free of AQDS, the highest values for the first-order kinetic constant (k1) were found with co-substrates formate and glucose. In the assa ...
... The effects of Brassicacaea processing water on polyphenol oxidases from different plant sources were investigated. Results showed that processing water (PW) prepared by cooking young Brassicacaea leaves with water has the capacity to inhibit both commercial tyrosinase and plant polyphenol oxidases. PW was freeze-dried (LPW) in an attempt to increase its utility and improve its efficiency at inhib ...
... Olive leaves, an agricultural waste, have great potential as a natural antioxidant. The current study was made to assess the antioxidant and antimicrobial activities of both the individual and combined phenolics in olive leaf extract. A combined phenolics mixture was prepared by amount ratios of the phenolic compounds in the olive leaf extract. The results showed that both the individual and combi ...
... Antioxidative properties of hydrophilic extracts prepared from the fruiting body and spent culture medium of Flammulina velutipes were evaluated by monitoring the total reducing power ability (RPA) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity (RSA), together with antioxidative activities against lipid oxidation in homogenates of yellowtail dark muscle and autoxidation ...
... Sixty-eight isolates of the filamentous fungus Aspergillus niger were examined for calcium gluconate production under submerged culture conditions in 500-ml Erlenmeyer flasks. The isolate Chem-15 was selected for improvement through ultraviolet (UV) light-induced mutagenesis. Among viable mutants, strain 32 exhibited the best gluconate productivity, and it was subjected to N-methyl N-nitro N-nitro ...
... Measurement of volume, surface area, and density is an essential for quantifying, evaluating, and designing the biomass densification, storage, and transport operations. Acquiring accurate and repeated measurements of these parameters for hygroscopic densified biomass are not straightforward and only a few methods are available. A 3D laser scanner was used as a measurement device and the 3D images ...
surface tension; salts; whey; microbial growth; Acinetobacter calcoaceticus; system optimization
Abstract:
... A novel and economical method was used to optimize bacterial growth and bioemulsan production. Acinetobacter calcoaceticus PTCC 1641 was applied in an innovated synthetic medium comprised whey and mineral salt medium (MSM) in ratio of 1:1 in a shaken flask bioreactor. The optimum inoculum size, shaking frequency rate and filling volume (VL) using ventilation flasks were investigated that resulted ...
biotransformation; corn stover; endo-1,4-beta-glucanase; fermentation; furfural; hydroxymethylfurfural; monosodium glutamate; wastewater; water pollution; China
Abstract:
... Reducing process cost of the bioconversion of lignocellulosic is a challenge. In China, abundant acidic wastewater from monosodium glutamate production is difficult to treat, leading to serious water pollution. In this study, acidic liquid (ALC) and solid residue components (SC) obtained from the wastewater were used in pretreatment and cellulase production, respectively, to evaluate their potenti ...
bacteria; bacterial communities; community structure; temperature; wastewater treatment
Abstract:
... To accelerate the start-up of biological municipal wastewater treatment processes at low temperatures and ensure their daily stable performances, bioaugmentation was adopted with the addition of specialized mixed bacteria. As a result, three types of biological processes were successfully started within 15days and showed stable and efficient daily performances. Results of PCR-DGGE analysis demonst ...
Bacillus pumilus; biobleaching; chlorine; delignification; enzymatic treatment; kraft pulp; polygalacturonase; porosity; pulp and paper industry; synergism; viscosity; xylanases
Abstract:
... A synergistic action of xylano-pectinolytic enzymes from the same bacterial isolate Bacillus pumilus was evaluated for the prebleaching of kraft pulp. The enzymatic prebleaching of kraft pulp resulted in 8.5% reduction in kappa number of the pulp, showing remarkable delignification with the enzyme treatment. This approach resulted in 25% reduction in active chlorine consumption in subsequent bleac ...
... Application of organic waste materials such as food processing and serving industry cooking oil waste (OFW) can recycle soil nitrate nitrogen (NO₃-N), which is otherwise prone to leaching after the harvest of crop. Nitrogen (N) recycling will not only reduce the amount of N fertilizer application for corn crop production but is also expected to mitigate green house gas (GHG) emissions by saving en ...
case studies; effluents; energy; energy use and consumption; life cycle inventory; models; water conservation; water reuse; China
Abstract:
... In order to illuminate the benefit of a wastewater treatment and reuse project, a life cycle assessment (LCA) model was proposed by combining the process-based LCA and the input-output based LCA in one framework and using energy consumption as the sole parameter for quantitative evaluation of the project. The life cycle consumption was evaluated mainly by life cycle inventory (LCI) analysis taking ...
... Different types of southern European hardwoods and softwoods were subjected to a liquefaction process with glycerol/diethylene glycol. The liquefied spruce wood was reacted in a condensation reaction in the hot press with different melamine-formaldehyde and melamine-urea-formaldehyde resin precursors and used as adhesives for wood particle boards. The mechanical properties of these particle boards ...
biopsy; carbon; chemical oxygen demand; effluents; fouling; gases; hydrocarbons; industry; irrigation rates; microorganisms; oils; reverse osmosis; salt content; salts; wastewater; water reuse
Abstract:
... Oil and gas field wastewater or produced water is a significant waste stream in the oil and gas industries. In this study, the performance of a membrane sequencing batch reactor (MSBR) and membrane sequencing batch reactor/reverse osmosis (MSBR/RO) process treating produced wastewater were investigated and compared. The MSBR was operated in different hydraulic residence time (HRT) of 8, 20 and 44h ...
... Production of recombinant Oryza sativa non-symbiotic hemoglobin 1 (OsHb1) by Escherichia coli was maximized in shake-flask cultures in media containing tryptone, yeast extract, sodium chloride and byproduct glycerol from biodiesel production. Response surface methodology (RSM) and artificial neural networks (ANNs), followed by multiple response optimization through a desirability function were app ...
application parameters; energy; guidelines; hot water treatment; pastes; power plants; prediction; sewage sludge; slurries; temperature; viscosity
Abstract:
... Dewatered sewage sludge (approximately 80% water, but with low fluidity) was liquidized by hydrothermal treatment in order to make coal-water paste (CWP) for use in a pressurized-fluidized-bed-combustion (PFBC) power plant. Prediction of the viscosity of the dewatered sewage sludge during batch reactor hydrothermal liquefaction is important in order to avoid inputting excess energy. A single param ...
activated sludge; heavy metals; bioremediation; wastewater treatment; carbohydrate composition; biosolids; amino acid composition; Lumbriculus variegatus; protein content; biomass
Abstract:
... The increasing production of biological waste sludge from wastewater treatment plants is a problem, because stricter legislation inhibits the use of traditional disposal methods. The use of the aquatic worm Lumbriculus variegatus can minimise sludge production. Because the worms can feed and grow on this waste sludge, valuable compounds that are present in the sludge can be recovered by the worms. ...
... Hardwood 4-O-methylglucuronoxylans (MGX) are classically isolated by a delignification step, using a sodium chlorite solution, followed by alkaline extraction, an efficient, although potentially polluting process. In this work, we propose a chlorine-free environmentally-friendly process for MGX extraction from Castanea sativa Mill. Chestnut sawdust was first delignified using metalled phthalocyani ...
... The arbuscular mycorrhizal (AM) hyphae-mediated uptake of polycyclic aromatic hydrocarbons (PAHs) by the roots of ryegrass (Lolium multiflorum Lam.) was investigated using three-compartment systems. Glomus mosseae and Glomus etunicatum were chosen, and fluorene and phenanthrene were used as representative PAHs. When roots were grown in un-spiked soils, AM hyphae extended into PAH-spiked soil and c ...
... The present study was undertaken to evaluate the ability of some Indian ferns to accumulate and tolerate arsenic. Twelve species of Indian ferns were exposed to 10mgL⁻¹ arsenic as sodium arsenate for 15days in hydroponic system. Depending on the arsenic uptake in the plant parts -Pteris vittata, Pteris cretica, Adiantum capillus-veneris and Nephrolepis exaltata may be categorised as arsenic accumu ...
... The response of Leptospirillum ferriphilum ML-04 to arsenic stress was analyzed using two-dimensional electrophoresis (2-DE), matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS). Thirty-eight of 65 significantly differentially expressed arsenic response proteins were identified, and 25 of them have known functions. Three proteins are arsenic resistance syste ...
... This study determined the role of plant and microbes in arsenite (AsIII) oxidation in the growth media and the location of AsIII oxidation and arsenate (AsV) reduction in Pteris vittata tissues. P. vittata grew in 0.10-0.27mM AsV or AsIII solution under aerated or sterile condition for 1h to 14d. Arsenic speciation was conducted in the growth media, biomass (roots, rhizomes, rachis, pinnae, and fr ...
... A nonlinear model describing the relationship between the biosurfactant concentration as a process output and the critical medium components as the independent variables was developed by artificial neural network modeling. The model was optimized for the maximum biosurfactant production by using genetic algorithm. Based on a single-factor-at-a-time optimization strategy, the critical medium compon ...
... Cellulase was covalently immobilized on a smart polymer, Eudragit L-100 by carbodiimide coupling. Using data of central composite design, response surface methodology (RSM) and artificial neural network (ANN) were developed to investigate the effect of pH, carbodiimide concentration, and coupling time on the activity yield of immobilized cellulase. Results showed simulation and prediction accuracy ...
... Non-point source pollution such as land-spreading of nitrogen-rich piggery wastewater poses a significant threat to surface waters. The aim was to examine the treatment of anaerobically digested piggery wastewater using four different meso-scale integrated constructed wetland (ICW) systems planted with Glyceria maxima. Four replicates were used for each system to assess differences due to nutrient ...
... Activated sludge is widely used to treat industrial wastewater, but its efficiency is affected by a variety of factors, including toxic substances such as tetrahydrofuran (THF). In this study, we examined the toxicity of THF at different concentrations (0-320mM) on the microbial community in activated sludge. A remarkable dose-dependent decrease in the total organic compound removal rate and cultu ...
... This study explored dye decolorization and bioelectricity generation of indigenous Proteus hauseri ZMd44 for dye-bearing wastewater treatment. Chemical structures of azo dyes apparently affected the performance of dye biodecolorization. Additions of diazo dye C.I. reactive blue 160 (RBu160) stimulated simultaneous dye decolorization and bioelectricity generation of ZMd44 in single chamber microbia ...
... The asymmetric reductions of acetophenone and its analogues using once immobilized Rhodotorula glutinis cells were studied. The performance and reaction parameters of the immobilized cells were also investigated and it was determined that the cells could be used 15 times in batch processes. All chiral alcohols obtained using purification procedures were of sufficient enantiopurity (>99%) of the (S ...
... Five types of fixed media bioreactors (biofilters) - sand, felt (textile), peat, felt/sand, and peat/sand - were used to treat sanitary sewer overflow (SSO). A simulated 6-h peak flow of a 25-yr SSO event contained 40-125mg/l biochemical oxygen demand (BOD₅) and was loaded on the bioreactors at a high hydraulic loading rate of 0.2m/h. The sand bioreactors were the most effective in the treatment, ...
... Cost effective use of lignocellulosic biomass for bio-based chemical production requires the discovery of novel strains and processes. Lactobacillus pentosus JH5XP5 is a carbon catabolite repression negative mutant which utilizes glucose and pentoses derived from lignocellulosic biomass in the media simultaneously. With a broad range of carbon substrates, L. pentosus JH5XP5 produced a significant ...
... This study investigated autochthonous yeasts and their functions in the spontaneous fermentation of freshly crushed pineapple juice samples collected from two different areas of both Thailand and Australia. Hanseniaspora uvarum and Pichia guilliermondii were the main yeast species observed on the fruit skins of Thai samples, and also in the fresh juice and ferments of all samples from both countri ...
renewable energy sources; polycyclic aromatic hydrocarbons; wood; pyrolysis; biomass; chemical structure
Abstract:
... Conventional analytical methods such as ¹H NMR, vapor pressure osmometry (VPO) and elemental analysis were used to characterize the tar obtained from pyrolysis of pine. The major fraction of tar obtained during pyrolysis of pine at different temperatures was the insoluble fraction in n-heptane which corresponds to asphaltenes; this fraction was characterized and analyzed using average structural p ...
... A microbial fuel cell and anaerobic-aerobic sequential reactor coupled system was used for azo dye degradation with simultaneous electricity production. Electricity was produced during the co-metabolism process of glucose and azo dye. A microorganism cultured graphite-granular cathode effectively decreased the charge transfer resistance of the cathode and yielded higher power density. Operation pa ...
... Status of, and changes in, the bacterial communities at two acclimation stages (with- and without-ultrasound) in a small 70°C ultrasound-enhanced anaerobic reactor for treating carbazole-containing wastewater reactor were analyzed by PCR-DGGE and real-time PCR techniques. PCR-DGGE results indicated that a large number of bands occurred in the whole sludge samples. Pseudomonas sp., Comamonas sp., a ...
... Adhesion of Pseudomonas putida F1 onto agave-fiber/recycled-polyethylene foamed composites was studied under different controlled conditions. The adhesion process was analyzed in batch experiments controlling factors such as pH, contact time, temperature, initial biomass concentration and ionic strength; and was verified by scanning electron microscopy (SEM). The number of adhered bacteria after t ...
... This study was carried out in order to quantify enteric bacteria and identify the presence of Salmonella spp., Escherichia coli, Clostridium perfringens and Erysipelothix rhusiopathiae in the liquid fraction of excreta generated from a small scale swine farm by means of a primary treatment system, consisting of the separation of solids and the sedimentation of liquids. Samples were collected at th ...
... The modified cellulose solvent- (concentrated phosphoric acid) and organic solvent- (95% ethanol) based lignocellulose fractionation (COSLIF) was applied to a naturally-dry moso bamboo sample. The biomass dissolution conditions were 50°C, 1atm for 60min. Glucan digestibility was 88.2% at an ultra-low cellulase loading of one filter paper unit per gram of glucan. The overall glucose and xylose yiel ...
... Confocal raman microscopy has been used to monitor the structural and chemical changes upon NaOH treatment of Miscanthus x giganteus, a potential energy crop and a model lignocellulosic material. Longitudinal and transversal-section images of the parenchyma cells in raw miscanthus samples reveal that lignin and cellulose are collocated in the cell wall and that a globular structure, composed predo ...
... A marine microalga, Schizochytrium limacinum SR21 has been found to grow fast on crude glycerol - a major by-product from the current biodiesel industry. Using crude glycerol derived from restaurant used oils (yellow grease), we have determined that glycerol concentrations of 25 and 35g/l were the optimal ones for untreated and treated crude glycerol in batch cultures, respectively. Biomass dry we ...
... The efficiency of manure separation by a conveyor belt under a partially slatted floor for fattening pigs was determined for two types of belts, a flat belt with an incline of up to 6° transversely and a concave belt with an incline of up to 1° longitudinally. A 31.20% and 23.75% dry matter content of the solid fraction was obtained for the flat and concave belt, respectively. The flat belt was mo ...
fish culture; crustacean culture; biotransformation; cell growth; algae; live feeds; fish larvae; anaerobic digestion; Chlorella vulgaris; Moina; fish feeding; zooplankton; pig manure
Abstract:
... The bio-conversion rate of Moina australiensis fed with Chlorella vulgaris grown on digested piggery effluent at three different feeding rates was determined and a 2, 3 and 4-day harvest interval strategy was investigated. This study indicates that C. vulgaris is a suitable food source for M. australiensis. A significant difference (P ≤ 0.001) in the feeding rate against mean total populations was ...
agricultural wastes; bioethanol; biomass; emissions; energy; ethanol production; forests; infrastructure; issues and policy; lignocellulose; municipal solid waste; raw materials; transportation; Malaysia
Abstract:
... The present study reveals the perspective and challenges of bio-ethanol production from lignocellulosic materials in Malaysia. Malaysia has a large quantity of lignocellulosic biomass from agriculture waste, forest residues and municipal solid waste. In this work, the current status in Malaysia was laconically elucidated, including an estimation of biomass availability with a total amount of 47,40 ...
... Biomass feedstock having less competition with food crops are desirable for bio-ethanol production and such resources may not be localized geographically. A distributed production strategy is therefore more suitable for feedstock like water hyacinth with a decentralized availability. In this study, we have demonstrated the suitability of this feedstock for production of fermentable sugars using ce ...
... Biodegradation of TCE was studied in a biofilter packed with wood charcoal and inoculated with diazotrophic bacterial community isolated from local soil. Steady state TCE removal efficiencies higher than 85% were observed up to inlet load of 2.866gm⁻³ h⁻¹. The maximum elimination capacity of 5.31gm⁻³ h⁻¹ was observed at an inlet load of more than 7.90gm⁻³ h⁻¹. The biofilter was sensitive to fluctu ...
Chlamydomonas; Chlorella; alternative fuels; biodiesel; calcite; docosahexaenoic acid; docosapentaenoic acid; freshwater; palmitic acid; production technology
Abstract:
... In this study, an attempt was made to use micro-algal system for the production of biodiesel precursors and simultaneous CO₂ mitigation. Chlorella sp. was found to have a higher growth rate as compared to the other algal species tested namely Chlamydomonas sp. and Synnecococcus sp. At different CO₂ concentrations (0.03%, 3%, 10% and 15%), the lipid productivity was 23.0, 20.0 and 27.3mg/L/d respec ...
... The amount of waste furniture generated in Korea was over 2.4 million tons in the past 3 years, which can be used for renewable energy or fuel feedstock production. Fast pyrolysis is available for thermo-chemical conversion of the waste wood mostly into bio-oil. In this work, fast pyrolysis of waste furniture sawdust was investigated under various reaction conditions (pyrolysis temperature, partic ...
biomass; energy density; pipelines; tanks; trailers; transportation; trucks; variable costs
Abstract:
... Bio-oil, produced by fast pyrolysis of biomass, has high energy density compared to ‘as received' biomass. The study assesses and compares the cost of transportation ($/liter of bio-oil) of bio-oil by pipeline and truck. The fixed and variable cost components of transportation of bio-oil at a pipeline capacity of 560m³/day and to a distance of 100km are 0.0423$/m³ and 0.1201$/m³/km, respectively. ...
... The present work describes a research approach to the anaerobic bioleaching of Fe(III) ores. Three strains (Serratia fonticola, Aeromonas hydrophila and Clostridium celerecrescens) isolated from an acidic abandoned mine were selected to test their ability to reduce dissimilatory Fe(III). Total iron bio-reduction was achieved after 48h using either the consortium or the Aeromonas cultures. In the l ...
methane production; biogas; ethers; biorefining; pulp and paper mills; kraft pulping; biomass; lignin; pulp and paper mill effluents; gasification
Abstract:
... There is great interest in developing black liquor gasification technology over recent years for efficient recovery of bio-based residues in chemical pulp mills. Two potential technologies of producing dimethyl ether (DME) and methane (CH₄) as alternative fuels from black liquor gasification integrated with the pulp mill have been studied and compared in this paper. System performance is evaluated ...
... The study investigated the bioaccumulation of Cu, Zn, Pb and Cd in Eisenia fetida fed on pig manure in greenhouse, and its relationship to bioavailability of these elements in pig manure. Metals in exchangeable, carbonates-bound and Fe-Mn oxides-bound fractions obtained by sequential extraction were considered to be bioavailable. The bioaccumulation factors (BAFs) of E. fetida to heavy metals were ...
... Lignocellulosic materials can significantly contribute to the development of biobased composites. In this work, glyoxal-phenolic resins for composites were prepared using glyoxal, which is a dialdehyde obtained from several natural resources. The resins were characterized by ¹H, ¹³C, 2D, and ³¹P NMR spectroscopies. Resorcinol (10%) was used as an accelerator for curing the glyoxal-phenol resins in ...
... A new biobleaching sequence, with two enzymatic stages based on the application of laccase-mediator systems, was tested (L₁EL₂QPo) in order to increase the effectiveness of enzyme delignification on eucalypt kraft pulp. Different synthetic - 1-hydroxybenzotriazole (HBT) and violuric acid (VA) - and natural - syringaldehyde (SyAl) - mediators were used in the laccase stages and the biobleached pulp ...
... A hydrolysis of 62% and 50% for OSX (Oat spelt xylan) and WBH (Wheat bran hemicellulose) were obtained in 36h and 48h using Accellerase™ 1000 at 50°C wherein thermostable xylanase from alkalothermophilic Thermomonospora sp. yielded 67% (OSX) in 3h and 58% (WBH) in 24h at 60°C, favouring a reduction in process time and enzyme dosage. The rate of hydrolysis with thermostable xylanase was increased b ...
... This study was designed to investigate the effect of anaerobic digestion on biochar produced from sugarcane bagasse. Sugarcane bagasse was anaerobically digested to produce methane. The digested residue and fresh bagasse was pyrolyzed separately into biochar at 600°C in nitrogen environment. The digested bagasse biochar (DBC) and undigested bagasse biochar (BC) were characterized to determine thei ...
... Biochemical and enzymatic properties of a fibrinolytic enzyme purified from Pleurotus eryngii cultivated under solid-state conditions using corn cob as energy source were investigated. The molecular mass of the enzyme was estimated to be 14kDa by SDS-PAGE. The enzyme exhibited the highest activity (28.96mol/min/mg) for the substrate tosyl-Gly-Pro-Lys-p-nitroanilide. K m and V max values were 0.18m ...
... Plant is one of the important resources for glycosyl hydrolase production. A β-exoglucanase with molecular weight of 63.1kDa was purified from fresh maize stover and subjected to enzymatic characterization. The optimal temperature and pH of the β-exoglucanase was 40°C and 6.0, respectively. The β-exoglucanase was active against p-nitrophenyl-cellobiose (p-NPC), laminarin, cellotriose, cellotetraos ...
... The effect of growth stage at harvest and of storage practice on the biochemical methane potential (BMP) of winter wheat was investigated using batch-fed stirred mesophilic digesters. The wheat used was a single variety sown at the same time (autumn) and harvested at 3 different stages in its growth: medium milk (A), soft dough (B) and Caryopsis (C). Wheats (A and B) were ensiled whilst the later ...
Musa textilis; polypropylenes; tensile strength; composite wood products
Abstract:
... In this paper, abaca strands were used as reinforcement of polypropylene matrix and their tensile mechanical properties were studied. It was found relevant increments on the tensile properties of the abaca strand-PP composites despite the lack of good adhesion at fiber-matrix interface. Afterwards, it was stated the influence of using maleated polypropylene (MAPP) as compatibilizer to promote the ...
... A Gram-positive bacterium, N52, that produces intracellular glucan from l-arabinose, was isolated from soil and identified as Sporosarcina sp. according to rRNA gene sequence analysis and physiological/biochemical characterizations. Glucan production by N52 increased significantly in the exponential phase of aerobic liquid culture and was maintained at the highest level during the stationary phase ...