Biochar facilitates rapid restoration of methanogenesis by enhancing direct interspecies electron transfer after high organic loading shock
| Autor: | Jinjing Huang, Yang Liu, Xiangyang Xu, Shaodong Zhu, Liang Zhu, Bo Xing, Chen Wang, Caiqin Wang |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Acidogenesis Environmental Engineering Methanogenesis Bioengineering Electrons 010501 environmental sciences 01 natural sciences Waste Disposal Fluid Methanosaeta Bioreactors 010608 biotechnology Biochar Anaerobiosis Waste Management and Disposal Effluent 0105 earth and related environmental sciences biology Sewage Renewable Energy Sustainability and the Environment Chemistry General Medicine Methanosarcina biology.organism_classification Desulfovibrio Environmental chemistry Charcoal Methane Geobacter |
| Zdroj: | Bioresource technology. 320 |
| ISSN: | 1873-2976 |
| Popis: | This study evaluated the effectiveness of biochar addition against high organic loading shock (OLS) of 80 kg COD/m3/d in up-flow anaerobic sludge blanket (UASB) reactors (R1 with biochar; R2 without biochar). After OLS of 24 h, R2 suffered the irreversible acidification (pH of 5.42 ± 0.07) with low biogas production of 0.08 ± 0.01 m3/kg COD/d. In contrast, the biogas production in R1 restored rapidly to 0.33 ± 0.04 m3/kg COD/d, and effluent pH in R1 returned to 7.01 ± 0.22. With addition of biochar, potential direct interspecies electron transfer (DIET) partners, including volatile fatty acids (VFAs)-oxidizing bacteria (Bacteroidetes, Smithella, Desulfovibrio, Geobacter) and methanogens (Methanosaeta, Methanosarcina) were enriched in R1, which were conductive to maintain the balance of acidogenesis and methanogenesis. Moreover, the retention of Methanosaeta and Methanosarcina coupled with biochar maintained the structural stability of granular sludge in R1 under the pressure of OLS and VFAs, which guaranteed the stability of anaerobic system. |
| Databáze: | OpenAIRE |
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