Responses of microbial community and acidogenic intermediates to different water regimes in a hybrid solid anaerobic digestion system treating food waste
| Autor: | Ammaiyappan Selvam, Obuli. P. Karthikeyan, Suyun Xu, Jonathan W C Wong |
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| Rok vydání: | 2014 |
| Předmět: |
Acidogenesis
Environmental Engineering Hydraulic retention time Bioengineering Solid Waste DNA Ribosomal Polymerase Chain Reaction Bioreactors Ethanol fuel Anaerobiosis Leachate Food science Waste Management and Disposal Effluent Phylogeny Biological Oxygen Demand Analysis chemistry.chemical_classification Principal Component Analysis Bacteria Waste management Denaturing Gradient Gel Electrophoresis Renewable Energy Sustainability and the Environment Chemistry Water General Medicine Hydrogen-Ion Concentration Fatty Acids Volatile Archaea Refuse Disposal Anaerobic digestion Food waste Food Biofuels Propionate Acids |
| Zdroj: | Bioresource Technology. 168:49-58 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2014.04.090 |
| Popis: | This study investigated the effects of different water regimes in an acidogenic leach bed reactor (LBR) during 16-day batch mode food waste digestion. LBRs were operated under five water replacement ratios (WRRs) (100%, 75%, 50%, 25% and 5% in LBRs R1, R2, R3, R4 and R5, respectively) and methanogenic effluent (ME) addition with two leachate recirculation frequencies (once in 24 h and 12 h in LBRs R6 and R7, respectively). Results showed that 50-100% WRRs accelerated the hydrolysis and acidogenesis with butyrate as the dominant product (∼35% of COD); whereas 5-25% WRRs promoted propionate production. The ME recirculation enhanced protein decomposition and reduced ethanol production. Lactobacillus dominated in LBRs with water addition (R1-R5), while Clostridium and hetero-fermenting lactic acid bacteria dominated in LBR with ME addition (R7). The highest volatile solid degradation (82.9%) and methane yield (0.29 L-CH4/g VS) were obtained with ME addition at 0.7 d hydraulic retention time. |
| Databáze: | OpenAIRE |
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