生物炭缓解餐厨垃圾厌氧消化酸化的效果及机制

李旭升; 鹿莎莎; 江远琰; 王里奥

doi:10.13205/j.hjgc.202112027

生物炭缓解餐厨垃圾厌氧消化酸化的效果及机制

doi: 10.13205/j.hjgc.202112027

李旭升^1,2,
鹿莎莎^1,2,
江远琰^1,2,
王里奥^1,2, ,

1. 重庆大学煤矿灾害动力学与控制国家重点实验室, 重庆 400044;
2. 重庆大学环境与生态学院, 重庆 400044

基金项目:

社区垃圾源头智能分类与清洁收集技术及装备(2019YFC906100)。

详细信息

作者简介:
李旭升(1996-),男,硕士研究生,主要研究方向为水污染控制。478035885@qq.com

通讯作者:
王里奥(1956-),女,教授,主要研究方向为固体废物污染控制及资源化利用。wangliao@cqu.edu.cn

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出版历程
- 收稿日期: 2021-03-18
- 网络出版日期: 2022-03-30
- 刊出日期: 2022-03-30

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

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

摘要

摘要: 研究了在高有机负荷(30 g VS/L,VS为挥发性固体含量)下生物炭缓解餐厨垃圾厌氧消化酸化,促进产甲烷的效应及机制。结果表明:碱性多孔生物炭在最优添加量下(1 g/g VS),反应20 d时,累积产甲烷量达到312.40 mL/(g·VS),与对照组相比提升了101.7%,同时产甲烷停滞期缩短62%。并在酸化最严重时挥发性脂肪酸(VFA)含量降低1151.28 mg/L。研究结果表明:生物炭的多孔结构是促进挥发性脂肪酸分解的关键因素,碱度和营养物质可以起到促进作用。高通量测序结果表明:最佳添加量下甲烷丝菌属(Methanothrix)、拟杆菌(Bacteroidales)、梭菌(Clostridiales)的相对丰度分别由26.12%、43.08%和9.95%提高到46.05%、56.25%和12.20%。生物炭缓解餐厨垃圾消化酸化的机制是为微生物提供反应场所,增强了微生物间的电子传递,提高了厌氧微生物的呼吸速率。
- 厌氧消化 /
- 生物炭 /
- 餐厨垃圾 /
- 种间电子传递 /
- 酸化
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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