EFFECT AND MECHANISM OF BIOCHAR IN MITIGATING ACIDIFICATION OF ANAEROBIC DIGESTION PROCESS FOR FOOD WASTE

LI Xu-sheng; LU Sha-sha; JIANG Yuan-yan; WANG Li-ao

doi:10.13205/j.hjgc.202112027

Volume 39 Issue 12

Mar. 2022

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LI Xu-sheng, LU Sha-sha, JIANG Yuan-yan, WANG Li-ao. EFFECT AND MECHANISM OF BIOCHAR IN MITIGATING ACIDIFICATION OF ANAEROBIC DIGESTION PROCESS FOR FOOD WASTE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 179-187. doi: 10.13205/j.hjgc.202112027

Citation:

LI Xu-sheng, LU Sha-sha, JIANG Yuan-yan, WANG Li-ao. EFFECT AND MECHANISM OF BIOCHAR IN MITIGATING ACIDIFICATION OF ANAEROBIC DIGESTION PROCESS FOR FOOD WASTE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 179-187. doi: 10.13205/j.hjgc.202112027

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EFFECT AND MECHANISM OF BIOCHAR IN MITIGATING ACIDIFICATION OF ANAEROBIC DIGESTION PROCESS FOR FOOD WASTE

doi: 10.13205/j.hjgc.202112027

LI Xu-sheng^1,2,
LU Sha-sha^1,2,
JIANG Yuan-yan^1,2,
WANG Li-ao^{1,2
,
,}

1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;
2. College of Environment and Ecology, Chongqing University, Chongqing 400044, China

Received Date: 2021-03-18
Available Online: 2022-03-30
Publish Date: 2022-03-30

Abstract

Abstract

A stimulated experiment was carried out to investigate the promotion of anaerobic digestion of kitchen waste by biochar at high organic loads(30 g VS/L). The results indicated that the cumulative methane production was increased by 101.7% to 312.40 mL CH₄/g VS after 20 d at the optimum addition of alkaline porous biochar(1 g/g VS), while the lag phase for methane production was reduced by 62% as compared to the control group. Besides, the addition of biochar reduced the volatile fatty acid(VFA) content by 1151.28 mg/L at the most severe acidifying stage. Mechanism exploration disclosed that the porous structure of biochar exerted vital influence on the decomposition of VFA, and alkalinity and nutrients also played an important role in the VFA degradation. The results of high-throughput sequencing showed that the relative abundance of Methanothrix, Bacteroidales and Clostridiales were increased from 26.12%, 43.08% and 9.95% to 46.05%, 56.25% and 12.20%, respectively. The underlying mechanism for biochar affecting the digestion were providing reaction sites for microorganisms, enhancing electron transfer among microorganisms, and accelerating the respiration rate of the microorganisms.
- anaerobic digestion,
- biochar,
- food waste,
- interspecies electron transfer,
- acidification

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References(54)

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