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1. Acetone–butanol–ethanol fermentation in a continuous and closed-circulating fermentation system with PDMS membrane bioreactor

Author:
Chen, Chunyan; Xiao, Zeyi; Tang, Xiaoyu; Cui, Haidi; Zhang, Junqing; Li, Weijia; Ying, Chao
Source:
Bioresource technology 2013 v.128 pp. 246-251
ISSN:
0960-8524
Subject:
Clostridium acetobutylicum; butanol; continuous fermentation; glucose; microorganisms; pervaporation
Abstract:
... Acetone–butanol–ethanol (ABE) fermentation by combining a PDMS membrane bioreactor and Clostridium acetobutylicum was studied, and a long continuous and closed-circulating fermentation (CCCF) system has been achieved. Two cycles of experiment were conducted, lasting for 274h and 300h, respectively. The operation mode of the first cycle was of fermentation intermittent coupling with pervaporation, ...
DOI:
10.1016/j.biortech.2012.10.077
PubMed:
23196246

2. Aerobic/anaerobic/aerobic sequenced biodegradation of a mixture of chlorinated ethenes, ethanes and methanes in batch bioreactors

Author:
Frascari, Dario; Fraraccio, Serena; Nocentini, Massimo; Pinelli, Davide
Source:
Bioresource technology 2013 v.128 pp. 479-486
ISSN:
0960-8524
Subject:
Lepidium sativum; aquifers; biodegradation; bioreactors; chlorides; chloroform; dechlorination; ecotoxicology; electrons; ethane; methane; propane; toxicity; trichloroethylene; vinyl chloride
Abstract:
... A novel aerobic/anaerobic/aerobic treatment was implemented in batch reactors containing aquifer materials from a site contaminated by tetrachloroethylene (PCE), trichloroethylene (TCE), vinyl chloride (VC), 1,1,2-trichloroethane (1,1,2-TCA) and chloroform (CF). Consortia grown aerobically on methane, propane, n-pentane and n-hexane completely biodegraded the chlorinated solvent mixture, via aerob ...
DOI:
10.1016/j.biortech.2012.10.026
PubMed:
23201903

3. A kinetic study of pyrolysis and combustion of microalgae Chlorella vulgaris using thermo-gravimetric analysis

Author:
Agrawal, Ankit; Chakraborty, Saikat
Source:
Bioresource technology 2013 v.128 pp. 72-80
ISSN:
0960-8524
Subject:
Chlorella vulgaris; activation energy; atmosphere; biomass; carbohydrates; combustion; heat; lipids; microalgae; proteins; pyrolysis; temperature; thermal analysis; thermogravimetry
Abstract:
... This work uses thermo-gravimetric, differential thermo-gravimetric and differential thermal analyses to evaluate the kinetics of pyrolysis (in inert/N2 atmosphere) and (oxidative) combustion of microalgae Chlorella vulgaris by heating from 50 to 800°C at heating rates of 5–40°C/min. This study shows that combustion produces higher biomass conversion than pyrolysis, and that three stages of decompo ...
DOI:
10.1016/j.biortech.2012.10.043
PubMed:
23196224

4. A lab-scale study of constructed wetlands with sugarcane bagasse and sand media for the treatment of textile wastewater

Author:
Saeed, Tanveer; Sun, Guangzhi
Source:
Bioresource technology 2013 v.128 pp. 438-447
ISSN:
0960-8524
Subject:
ammonia; anaerobic conditions; carbon; color; constructed wetlands; denitrification; fabrics; nitrogen; oxygen; pollutants; pollution load; sand; sugarcane bagasse; wastewater; wastewater treatment
Abstract:
... This paper reports the pollutant removal efficiencies of two lab-scale hybrid wetland systems treating a textile wastewater. The two systems had identical configurations, each consisting of a vertical flow (VF) and a horizontal flow (HF) wetland that were filled with organic sugarcane bagasse and sylhet sand as the main media. The systems were operated under high hydraulic loading (HL) (566–5660mm ...
DOI:
10.1016/j.biortech.2012.10.052
PubMed:
23201526

5. A new technique to pyrolyse biomass in a microwave system: Effect of stirrer speed

Author:
Abubakar, Zubairu; Salema, Arshad Adam; Ani, Farid Nasir
Source:
Bioresource technology 2013 v.128 pp. 578-585
ISSN:
0960-8524
Subject:
activated carbon; biomass; mixers; new methods; palm oils; phenol; problem solving; temperature profiles
Abstract:
... A new technique to pyrolyse biomass in microwave (MW) system is presented in this paper to solve the problem of bio-oil deposition. Pyrolysis of oil palm shell (OPS) biomass was conducted in 800W and 2.45GHz frequency MW system using an activated carbon as a MW absorber. The temperature profile, product yield and the properties of the products were found to depend on the stirrer speed and MW absor ...
DOI:
10.1016/j.biortech.2012.10.084
PubMed:
23211483

6. Animal carcass wastewater treatment and bioelectricity generation in up-flow tubular microbial fuel cells: Effects of HRT and non-precious metallic catalyst

Author:
Li, Xiaohu; Zhu, Nengwu; Wang, Yun; Li, Ping; Wu, Pingxiao; Wu, Jinhua
Source:
Bioresource technology 2013 v.128 pp. 454-460
ISSN:
0960-8524
Subject:
air; ammonia; animals; catalysts; chemical oxygen demand; electrodes; fuels; meat carcasses; microbial fuel cells; nitrates; wastewater; wastewater treatment
Abstract:
... Animal carcass wastewater (ACW) is a kind of typical high concentration organic wastewater. Up-flow tubular air cathode microbial fuel cells (MFCs) were constructed using 0, 4.0 and 8.0mg/cm2 MnO2 as cathodic catalyst, respectively (MFC-0, MFC-4 and MFC-8) to test the feasibility of bioelectricity production from ACW. After a start-up period of around 55d, when hydraulic retention time (HRT) was s ...
DOI:
10.1016/j.biortech.2012.10.053
PubMed:
23201528

7. A novel pathway construction in Candida tropicalis for direct xylitol conversion from corncob xylan

Author:
Guo, Xiaoxiao; Zhang, Ruihua; Li, Zhe; Dai, Dazhang; Li, Chun; Zhou, Xiaohong
Source:
Bioresource technology 2013 v.128 pp. 547-552
ISSN:
0960-8524
Subject:
Aspergillus terreus; Candida tropicalis; biomass; bioprocessing; corn cobs; genes; hydrolysis; saccharification; xylan; xylanases; xylitol; xylose
Abstract:
... In this study, an integrated xylitol production pathway, directly using xylan as the substrate, was constructed in Candida tropicalis BIT-Xol-1 which could efficiently convert xylose into xylitol. In order to consolidate this bioprocessing, a β-1,4-xylanase gene (atn) and a β-xylosidase gene (atl) were cloned from Aspergillus terreus, and were constructed onto episomal plasmid pAUR123. Additionall ...
DOI:
10.1016/j.biortech.2012.10.155
PubMed:
23211479

8. Application of rumen microorganisms for anaerobic bioconversion of lignocellulosic biomass

Author:
Yue, Zheng-Bo; Li, Wen-Wei; Yu, Han-Qing
Source:
Bioresource technology 2013 v.128 pp. 738-744
ISSN:
0960-8524
Subject:
anaerobic digestion; animals; biofuels; biomass; biotransformation; energy; methane; microbial communities; rumen; rumen development; rumen microorganisms; volatile fatty acids
Abstract:
... Rumen in the mammalian animals is a natural cellulose-degrading system and the microorganisms inside have been found to be able to effectively digest lignocellulosic biomass. Furthermore, methane or volatile fatty acids, which could be further converted to other biofuels, are the two major products in such a system. This paper offers an overview of recent development in the application of rumen mi ...
DOI:
10.1016/j.biortech.2012.11.073
PubMed:
23265823

9. Batch and continuous flow studies of adsorptive removal of Cr(VI) by adapted bacterial consortia immobilized in alginate beads

Author:
Samuel, Jastin; Pulimi, Mrudula; Paul, Madona L.; Maurya, Arun; Chandrasekaran, Natarajan; Mukherjee, Amitava
Source:
Bioresource technology 2013 v.128 pp. 423-430
ISSN:
0960-8524
Subject:
Acinetobacter junii; Bacillus subtilis; Escherichia coli; X-radiation; adsorption; bacteria; desorption; energy; groundwater; pH; spectroscopy; wastewater
Abstract:
... The adsorptive removal of Cr(VI) by alginate beads containing Cr(VI)-adapted Acinetobacter junii, Escherichia coli and Bacillus subtilis in batch and continuous packed bed column reactors was investigated. Under optimized conditions (pH 3.0; contact time, 180min; 30°C; initial Cr(VI) concentration of 100mg/L), 65.86mg/g adsorption capacity was recorded in the batch study. When an adsorbent dosage ...
DOI:
10.1016/j.biortech.2012.10.116
PubMed:
23201524

10. Bi-directional electrical characterisation of microbial fuel cell

Author:
Degrenne, N.; Ledezma, P.; Bevilacqua, P.; Buret, F.; Allard, B.; Greenman, J.; Ieropoulos, I.A.
Source:
Bioresource technology 2013 v.128 pp. 769-773
ISSN:
0960-8524
Subject:
electric current; hysteresis; microbial fuel cells
Abstract:
... The electrical performance of microbial fuel cells in steady-state is usually investigated by standard characterisation methods that reveal many important parameters e.g. maximum power. This paper introduces a novel “bi-directional” method to study how the acquisition parameters (i.e. sweep rate and sweep regime) can influence measurements and consequently performance estimations. The investigatio ...
DOI:
10.1016/j.biortech.2012.10.110
PubMed:
23186662

11. Biodegradation of di-n-butyl phthalate by a stable bacterial consortium, HD-1, enriched from activated sludge

Author:
He, Zhixing; Xiao, Hailong; Tang, Lu; Min, Hang; Lu, Zhenmei
Source:
Bioresource technology 2013 v.128 pp. 526-532
ISSN:
0960-8524
Subject:
Achromobacter; Burkholderia; activated sludge; biodegradation; bioremediation; carbon; denaturing gradient gel electrophoresis; dimethyl phthalate; energy; gas chromatography; mass spectrometry; mineralization; pH; phenol; phthalic acid; sodium acetate; yeasts
Abstract:
... HD-1, a stable microbial consortium capable of mineralizing di-n-butyl phthalate (DBP), was developed from activated sludge. The dominant microorganisms in the consortium, Gordonia sp., Burkholderia sp. and Achromobacter sp., were identified by denaturing gradient gel electrophoresis (DGGE). The consortium could mineralize approximately 90% of 1200mg/L DBP after 48h of cultivation. The optimal DBP ...
DOI:
10.1016/j.biortech.2012.10.107
PubMed:
23201908

12. Biodegradation of tetrabromobisphenol A by a novel Comamonas sp. strain, JXS-2-02, isolated from anaerobic sludge

Author:
Peng, Xingxing; Zhang, Zaili; Luo, Weishi; Jia, Xiaoshan
Source:
Bioresource technology 2013 v.128 pp. 173-179
ISSN:
0960-8524
Subject:
Comamonas; anaerobic conditions; biodegradation; carbon; energy; inoculum; metabolites; nucleotide sequences; pH; ribosomal DNA; salts; sequence analysis; sludge; temperature
Abstract:
... A bacterial strain able to rapidly degrade tetrabromobisphenol A (TBBPA), JXS-2-02, was isolated from anaerobic sludge that had been successfully enrichment by adding TBBPA for 240days. JXS-2-02 can use TBBPA as the sole carbon and energy source for growth in mineral salt medium. Based on morphology, biochemical characteristics and 16S rDNA sequence analysis, JXS-2-02 was identified as Comamonas s ...
DOI:
10.1016/j.biortech.2012.10.051
PubMed:
23201509

13. Bio-electrochemical post-treatment of anaerobically treated landfill leachate

Author:
Tugtas, A. Evren; Cavdar, Pelin; Calli, Baris
Source:
Bioresource technology 2013 v.128 pp. 266-272
ISSN:
0960-8524
Subject:
ammonia; effluents; electrodes; landfill leachates; microbial fuel cells; nitrification; nitrites; upflow anaerobic sludge blanket reactor
Abstract:
... Bio-electrochemical treatment of anaerobically pre-treated landfill leachate was investigated in batch and continuous-flow two-chambered microbial fuel cells (MFCs). A high strength young landfill leachate was pre-treated using an upflow anaerobic sludge blanket reactor and the effluent resembling medium-aged landfill leachate was fed to the anode chamber of MFCs. The highest maximum current and p ...
DOI:
10.1016/j.biortech.2012.10.035
PubMed:
23196249

14. Biogas production from wheat straw in batch and UASB reactors: The roles of pretreatment and seaweed hydrolysate as a co-substrate

Author:
Nkemka, Valentine Nkongndem; Murto, Marika
Source:
Bioresource technology 2013 v.128 pp. 164-172
ISSN:
0960-8524
Subject:
biogas; chemical oxygen demand; crop production; hydrolysates; macroalgae; methane; methane production; nutrients; steam; sugars; upflow anaerobic sludge blanket reactor; wheat straw
Abstract:
... This research evaluated biogas production in batch and UASB reactors from pilot-scale acid catalysed steam pretreated and enzymatic hydrolysed wheat straw. The results showed that the pretreatment was efficient and, a sugar yield of 95% was obtained. The pretreatment improved the methane yield (0.28m3/kg VSadded) by 57% compared to untreated straw. Treatment of the straw hydrolysate with nutrient ...
DOI:
10.1016/j.biortech.2012.10.117
PubMed:
23196235

15. Biological nitrogen removal from landfill leachate using anaerobic–aerobic process: Denitritation via organics in raw leachate and intracellular storage polymers of microorganisms

Author:
Zhu, Rulong; Wang, Shuying; Li, Jun; Wang, Kai; Miao, Lei; Ma, Bin; Peng, Yongzhen
Source:
Bioresource technology 2013 v.128 pp. 401-408
ISSN:
0960-8524
Subject:
carbon; chemical oxygen demand; effluents; electrons; glycogen; landfill leachates; microorganisms; nitrogen; nitrogen content; polymers
Abstract:
... A system which combined ASBR with pulsed SBR (PSBR) was introduced to enhance COD and nitrogen removal from the real landfill leachate. ASBR was used to degrade the organics from raw leachate mainly. Three equal feeds mode was applied in PSBR operation. The results obtained from the joint operation period (157days) show that the COD removal rate of ASBR was 83–88% under the specific loading rate o ...
DOI:
10.1016/j.biortech.2012.10.063
PubMed:
23201521

16. Biological nutrient removal by applying modified four step-feed technology to treat weak wastewater

Author:
Cao, Guihua; Wang, Shuying; Peng, Yongzhen; Miao, Zhijia
Source:
Bioresource technology 2013 v.128 pp. 604-611
ISSN:
0960-8524
Subject:
carbon; chemical oxygen demand; denitrification; nitrate reduction; nitrification; nitrogen; nitrogen content; phosphorus; sludge; wastewater
Abstract:
... For weak municipal wastewater (COD⩽200mgL−1, NH4+-N⩽40mgL−1) with low influent C/N, a pilot modified four step-feed process was applied for simultaneous biological nitrogen (N) and phosphorus (P) removal under different inflow distribution ratios. It was designed with a short hydraulic retention time of 8.7h to raise influent load, and the optimal effluent performance of COD, NH4+-N, total nitroge ...
DOI:
10.1016/j.biortech.2012.09.078
PubMed:
23211487

17. Borate enhances the production of lactulose from lactose by cellobiose 2-epimerase from Caldicellulosiruptor saccharolyticus

Author:
Kim, Yeong-Su; Kim, Jung-Eun; Oh, Deok-Kun
Source:
Bioresource technology 2013 v.128 pp. 809-812
ISSN:
0960-8524
Subject:
Caldicellulosiruptor saccharolyticus; borates; cellobiose; enzymes; lactose; lactulose
Abstract:
... Cellobiose 2-epimerase from Caldicellulosiruptor saccharolyticus was used in the presence of borate to increase the production of lactulose from lactose. Maximum production of lactulose occurred using a 1:1M ratio of borate–lactose. Under this condition, the enzyme produced 614gl−1 lactulose from 700gl−1 lactose after incubation at pH 7.5 and 80°C for 3h, with a conversion yield of 88% and a produ ...
DOI:
10.1016/j.biortech.2012.10.060
PubMed:
23177735

18. Cationic and anionic modifications of oil palm empty fruit bunch fibers for the removal of dyes from aqueous solutions

Author:
Sajab, Mohd Shaiful; Chia, Chin Hua; Zakaria, Sarani; Khiew, Poi Sim
Source:
Bioresource technology 2013 v.128 pp. 571-577
ISSN:
0960-8524
Subject:
adsorbents; adsorption; aqueous solutions; citric acid; desorption; fruits; methylene blue; pH; palm oils; phenol; temperature
Abstract:
... Oil palm empty fruit bunch (EFB) fibers were employed to remove dyes from aqueous solutions via adsorption approaches. The EFB fibers were modified using citric acid (CA) and polyethylenimine (PEI) to produce anionic and cationic adsorbents, respectively. The CA modified EFB fibers (CA-EFB) and PEI-modified EFB fibers (PEI-EFB) were used to study the efficiency in removing cationic methylene blue ...
DOI:
10.1016/j.biortech.2012.11.010
PubMed:
23211482

19. Cellulase production from a new strain Acremonium strictum isolated from the Brazilian Biome using different substrates

Author:
Goldbeck, Rosana; Ramos, Mayla M.; Pereira, Gonçalo A.G.; Maugeri-Filho, Francisco
Source:
Bioresource technology 2013 v.128 pp. 797-803
ISSN:
0960-8524
Subject:
Acremonium strictum; beta-glucosidase; biomass; carboxymethylcellulose; cellulose; ecosystems; endo-1,4-beta-glucanase; enzyme activity; fermentation; microorganisms; sugarcane bagasse
Abstract:
... The objective of the present study was to evaluate the production of cellulolytic enzymes by Acremonium strictum isolated from Brazilian Biome using different substrates. Fermentations were initially carried out using commercial substrates, including microcrystalline cellulose (AVICEL® and SERVACEL®) and carboxymethylcellulose (CMC). This was followed by fermentations performed using lignocellulos ...
DOI:
10.1016/j.biortech.2012.10.034
PubMed:
23186655

20. Changes in chemical and microbiological properties of rabbit manure in a continuous-feeding vermicomposting system

Author:
Gómez-Brandón, María; Lores, Marta; Domínguez, Jorge
Source:
Bioresource technology 2013 v.128 pp. 310-316
ISSN:
0960-8524
Subject:
Eisenia fetida; bacteria; earthworms; electrical conductivity; fatty acids; fungi; microbial activity; pH; rabbits; vermicomposting; wastes
Abstract:
... In the present study the potential of the earthworm Eisenia fetida to process large amounts of waste was evaluated through continuous feeding reactors in which new layers of rabbit manure were added sequentially to form an age gradient inside the reactors. An optimal moisture level, ranging from 66% to 76%, was maintained throughout the process using an automatic watering system. The pH was close ...
DOI:
10.1016/j.biortech.2012.10.112
PubMed:
23196253