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Effects of Iron-Loaded Biochar on the Anaerobic Co-Digestion of Food Waste and Sewage Sludge and Elucidating the Mechanism Thereof
| Content Provider | MDPI |
|---|---|
| Author | Lu, Wenxu Deng, Guanyong Cheng, Xiaoge Wang, Wan |
| Copyright Year | 2022 |
| Description | The inhibition of volatile fatty acid (VFA) production is an important factor affecting biogas (methane) production in the anaerobic co-digestion systems comprising food waste and sewage sludge. In this study, batch experiments were conducted at medium temperature (36 ± 0.5 °C), during which the biogas production index and material–liquid characteristic parameters of the anaerobic digestion systems containing different concentrations of iron-loaded biochar (Fe-BC) were monitored. The cumulative biogas production data were analyzed using a modified Gompertz kinetic model to determine the effect of the Fe-BC on biogas production in the anaerobic co-digestion system. Studies have shown that addition of Fe-BC does not significantly influence the hydrolysis and acidification stages of anaerobic co-digestion, but does have a significant effect on promoting methanogenesis by alleviating the accumulation of VFAs and improving both the buffer capacity of the system and the efficiency of substrate-to-biogas conversion. When the Fe-BC concentration was 16 $g·L^{−1}$, the cumulative biogas production reached 329.42 $mL·g-VS^{−1}$, which was 49.7% higher than the blank group, and the lag period was 3.55 d, which was 42% shorter than the blank group. Mechanistic studies have shown that Fe-BC increased the concentration of coenzyme $F_{420}$ and the conductivity of the digestate in the co-digestion system, which increased the activity of methanogens in the anaerobic digestion system, thereby promoting methanogenesis. |
| Starting Page | 9442 |
| e-ISSN | 20711050 |
| DOI | 10.3390/su14159442 |
| Journal | Sustainability |
| Issue Number | 15 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-08-01 |
| Access Restriction | Open |
| Subject Keyword | Sustainability Anaerobic Digestion Biochar Iron-loaded Biochar Sewage Sludge Food Waste |
| Content Type | Text |
| Resource Type | Article |
