Response of hydrolysis, methanogenesis, and microbial community structure to iron dose during anaerobic digestion of food waste leachate
| Autor: | Philip Antwi, Hao Su, Felix Tetteh Kabutey, Jianzheng Li, Meng Wu, Wuhui Luo, Dachao Zhang, Zuwen Liu |
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| Rok vydání: | 2020 |
| Předmět: |
biology
Renewable Energy Sustainability and the Environment Chemistry Methanogenesis 020209 energy 02 engineering and technology 010501 environmental sciences biology.organism_classification 01 natural sciences Methane Methanosaeta Anaerobic digestion chemistry.chemical_compound Food waste Microbial population biology Environmental chemistry 0202 electrical engineering electronic engineering information engineering Leachate Euryarchaeota 0105 earth and related environmental sciences |
| Zdroj: | Biomass Conversion and Biorefinery. 12:5959-5973 |
| ISSN: | 2190-6823 2190-6815 |
| DOI: | 10.1007/s13399-020-00996-4 |
| Popis: | Anaerobic digestion (AD) of biodegradable organics depends heavily diverse functional genera, but an attempt to simultaneously enhance the various AD phases including the rate-limiting step (hydrolysis acidification) and methanogenesis has often remained a challenge. Although zero-valent iron (ZVI) supplementation had been proposed by many, its effect on the biomethanation process and microbial community evolution has not been fully explored. In this study, the response of hydrolysis acidification, methanogenesis, kinetics, pollutant removal efficiency, and microbial community evolution to various doses of ZVI employed in AD of food waste leachate was investigated and reported. When 10 g/L ZVI was dosed in the AD system, hydrolysis acidification, COD removal, biomethanation, and methane percentage were elevated by 18.9%, 67%, 39%, and 36%, respectively, as opposed to the control reactor (R1). Kinetics (R2 of 0.998) revealed shorter lag phase (ƛ = 4.18 days) in ZVI-dosed reactors in contrast to longer periods (6.54 days) in R1. Methane production rate constant (k), sludge activity, and methane production rate estimated were 0.066 (day−1), 0.83 gCH4/gVSS, and 64.20 mLCH4/gVSS/day, respectively, suggesting ZVI promoted methane production rate. Hydrolytic and methanogenic phyla including Firmicutes, Chloroflexi, Bacteroidetes, and Euryarchaeota were more enriched in ZVI-dosed reactors as opposed to R1. Acetoclastic-(Methanosaeta) and hydrogenotrophic-(Methanobacterium) methanogens were the most abundant genera of the archaea within ZVI-dosed assays, indicating acetoclastic methanogenesis was the main pathway. |
| Databáze: | OpenAIRE |
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