An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
anaerobicdigesters, etc ; carbon; carboxylic acids; coculture; energy; fermentation; metagenomics; microbiome; multiomics; Show all 9 Subjects
Abstract:
... Medium-chain carboxylic acid (MCCA) production from organic wastes has attracted much attention because of their higher energy contents and diverse applications. Anaerobic reactor microbiomes are stable and resilient and have resulted in efficient performance during many years of operation for thousands of full-scale anaerobic digesters worldwide. The method underlying how the relevant microbial p ...
anaerobicdigesters, etc ; fluid mechanics; models; prediction; research; sludge; uncertainty analysis; wastewater; water; Show all 9 Subjects
Abstract:
... Sedimentation in waste water is a heavily studied topic, but mainly focused on hindered and compression settling in secondary sludge, a largely monodispersed solids, where bulk sedimentation velocity is effectively described by functions such as double Vesilind (Takacs). However, many waste water solids, including primary sludge and anaerobic digester effluent are polydispersed, for which applicat ...
anaerobicdigesters, etc ; Proteobacteria; biocathodes; biofilm; microbial communities; pH; species diversity; wastewater treatment; Show all 8 Subjects
Abstract:
... The feasibility and superiority of bioelectrochemical systems for the degradation of p-bromoaniline (p-BrA) have been confirmed previously. In this research, the influences of the cathode potential and initial p-BrA concentration on the performance of microbial electrolytic cells (MECs) were investigated. The degradation performance and degradation kinetics of a MEC and a conventional anaerobic re ...
anaerobicdigesters, etc ; ethanol; green chemistry; hydrophobicity; liquids; organic wastes; porous media; temperature; Show all 8 Subjects
Abstract:
... Medium-chain fatty acids (MCFAs) derived from organic waste have been recognized as a high-value biochemical, but their selective separation from the waste remains a challenge. Here, we demonstrate facile and selective MCFA recovery from synthetic organic waste streams using supported liquid membranes (SLMs). SLMs were fabricated by filling a nonpolar solution of trioctylphosphine oxide (TOPO) in ...
anaerobicdigesters, etc ; Methanosaeta; anaerobic digestion; bacterial communities; fish waste; food waste; methanogens; sludge; Show all 8 Subjects
Abstract:
... The effect of sudden augmentation with fish waste (FW) on an operating anaerobic digester was investigated. Fifteen repeated FW spikes (FWS) composed of 1% or 5% FW per working volume of digester were suddenly fed into semi-continuous operation of a mixture of sludge and food waste. Overall process efficiency was not inhibited by FW augmentation. The bacterial community were clustered differently ...
anaerobicdigesters, etc ; absorption; aerobic digestion; anaerobic digestion; chemical oxygen demand; liquids; sludge; wastewater; Show all 8 Subjects
Abstract:
... Absorption of ultraviolet (UV)-visible (Vis) light by the liquid phase of wastewater sludge during biological digestion was studied. Sludge samples were obtained from batch anaerobic and aerobic digestion experiments conducted at mesophilic and thermophilic temperatures, as well as influent and effluent of a full-scale anaerobic digester. In tandem with acquiring the UV-Vis spectra, the concentrat ...
anaerobicdigesters, etc ; anaerobic digestion; high performance liquid chromatography; models; near-infrared spectroscopy; research; titration; wavelet; Show all 8 Subjects
Abstract:
... The performance of anaerobic digestion is significantly governed by the concentration of volatile fatty acids (VFAs). Though the titration and near-infrared spectroscopy have been used to measure the VFAs in the digester, there is still lack of the establishment of on-line monitoring of VFAs in practical application. An effective quantification method based on mid-infrared (MIR) spectroscopy was d ...
anaerobicdigesters, etc ; Archaea; ammonia; anaerobic digestion; methane production; methanogens; microbial communities; microbiome; models; renewable energy sources; zeolites; Show all 11 Subjects
Abstract:
... Anaerobic digestion allows to produce sustainable energy but the microbial community involved in this process is highly sensitive to perturbations. In this study, a longitudinal experiment was performed in two sets of triplicate bioreactors to evaluate the influence of ammonia addition on AD microbiome and its recovery. Zeolite was added in three reactors to mitigate the inhibition. Microbial dyna ...
anaerobicdigesters, etc ; biochemical oxygen demand; chemical oxygen demand; oils; organic matter; poultry; slaughterhouses; sludge; wastewater; wastewater treatment; Show all 10 Subjects
Abstract:
... This study evaluated and compared the performance of three highly praised high rate anaerobic bioreactors (HRABs), including the expanded granular sludge bed (EGSB) bioreactor, the static granular bed reactor (SGBR), and the down-flow expanded granular bed reactor (DEGBR), for the treatment of poultry slaughterhouse wastewater (PSW) which is characterized by a high concentration in oil and grease, ...
... Anaerobic digestion of lignocellulosic biomass faces changes such as biomass floating and effluent discharge. To overcome these challenges, a unique removable cartridge anaerobic digester was built and tested using corn stover as the feedstock. Three operating methods differing in the number of cartridges and days of rotation were tested. The first method used three cartridges, with each cartridge ...
anaerobicdigesters, etc ; absorption; biogas; electric power; energy; fermentation; heat; insulating materials; methane; models; phase transition; slurries; temperature; Show all 13 Subjects
Abstract:
... Direct absorption methane reactor can maintain the fermentation process of microorganism by utilizing solar absorption and scattering of media in biogas reactor to improve the slurry temperature. However, direct absorption heating alone can save the corresponding electric energy and ensure the normal fermentation process of the biogas slurry in the reactor, but there are still problems of big temp ...
... BACKGROUND: Anaerobic co‐digestion has been considered for improving anaerobic digesters’ stability and methane production, particularly for residues with low biodegradability or lack of alkalinity. Food waste was identified as a biomass with macro and micronutrients unbalance and low alkalinity content, both of which hamper its anaerobic digestion. The present study focused on evaluating the anae ...
anaerobicdigesters, etc ; coal; cow manure; energy; gas production (biological); inoculum; methane; methane production; microbial culture; sludge; slurries; Show all 11 Subjects
Abstract:
... High energy consumption and depletion of fossil fuels lead to the introduction of new technologies to produce alternative fuels with fewer emissions of greenhouse gases. The present investigation was focused to utilize the waste coal washery rejects as a substrate to produce biogenic methane under optimum conditions. Experiments were performed to explore the efficiency of non-coal samples (cow dun ...
... Fluctuations in the anaerobic digestion (AD) organic loading rate (OLR) cause shocks to the AD microbiome, which lead to unstable methane productivity. Managing these fluctuations requires a larger digester, which is impractical for community-scale applications, limiting the potential of AD in advancing a circular economy. To allow operation of small-scale AD while managing OLR fluctuations, we ne ...
anaerobicdigesters, etc ; biogas; carbon; carbon dioxide; electricity; energy; heat; income; models; municipal wastewater; natural gas; steam; wastewater treatment; Show all 13 Subjects
Abstract:
... This paper proposes a realistic model for energy and carbon management of an advanced municipal wastewater treatment works. Through minimisation of total cost of operations, it provides operators with a visual daily operational schedule based on varying tariffs. This site is the first in the UK with a mixed operational strategy for biomethane produced on site: to burn in CHP (Combined Heat and Pow ...
... California’s dairy sector accounts for ∼50% of anthropogenic CH₄ emissions in the state’s greenhouse gas (GHG) emission inventory. Although California dairy facilities’ location and herd size vary over time, atmospheric inverse modeling studies rely on decade-old facility-scale geospatial information. For the first time, we apply artificial intelligence (AI) to aerial imagery to estimate dairy CH₄ ...
anaerobicdigesters, etc ; acid soluble lignin; aeration; anaerobic digestion; biogas; biomass; buffaloes; gas production (biological); lignin; lignocellulose; logit analysis; Show all 11 Subjects
Abstract:
... Microaeration pretreatment can enhance lignin degradation of lignocellulosic biomass and subsequent biogas production during anaerobic digestion (AD). However, the reported values of effective aeration dose, aeration contact time, and aeration frequency differ with substrates riddling the selection of a suitable combination. A serial approach was adopted to identify the suitable combination for th ...
... This study evaluated the performance of urban wastewater treatment in pilot-plant by an integrated system consisting of anaerobic reactor, microalgae cultivation, Venturi tube ozone recirculation, coagulation/flocculation with tannin-based agent natural coagulant, and dissolved air flotation (DAF). Ozone concentrations (without ozone, 0.13 and 0.25 mg O₃/mg of biomass) and tannin dosages (65, 85 a ...
anaerobicdigesters, etc ; Methanosaeta; anaerobic digestion; biofilm; carbon; chemical oxygen demand; energy efficiency; methane production; methanogens; voltammetry; wastewater; wastewater treatment; Show all 12 Subjects
Abstract:
... Anaerobic digestion (AD) has been considered an energy efficient strategy in treating high concentration organic wastewater rich in volatile fatty acids (VFAs). Continuous stirred tank reactors (CSTRs) have been widely applied in the AD process; however, they may suffer from low efficiency with a relatively short hydraulic retention time (HRT) in wastewater treatment. In this study, carbon cloth w ...