热碱法处理污泥沼渣及其厌氧发酵性能研究

刘宝村; 周集体; 金若菲; 田天; 崔甜甜

doi:10.13205/j.hjgc.202309020

热碱法处理污泥沼渣及其厌氧发酵性能研究

doi: 10.13205/j.hjgc.202309020

大连理工大学工业生态与环境工程教育部重点实验室, 辽宁大连 116024

基金项目:

循环利用石化废弃物减碳工艺技术开发（2022YF13GX061）

详细信息

作者简介:
刘宝村(1997-),男,硕士,主要研究方向为污泥资源化利用。674853932@qq.com

通讯作者:
周集体(1956-),男,教授,主要研究方向为环境微生物工程。zjiti@dlut.edu.cn

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- 文章访问数: 82
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-06
- 网络出版日期: 2023-11-15

ALKALINE-THERMAL HYDROLYSIS OF SEWAGE SLUDGE DIGESTATE AND ITS PERFORMANCE IN ANAEROBIC FERMENTATION

Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 针对污泥沼渣中有机质难以回收利用的问题，利用热碱法破解污泥沼渣，探究了不同条件对沼渣破解率和有机物溶出率的影响，确定了热碱法处理污泥沼渣的最佳条件为：pH=13、T=80℃、t=8 h。此条件下，污泥沼渣的破解率为40.9%，COD、蛋白质、多糖的溶出率分别为722.2，79.7，73.7 mg/g VSS。利用热碱处理后的污泥沼渣破解液进行厌氧发酵产甲烷，比较了不同初始pH值对厌氧发酵的影响，发现初始pH值的改变对有机物降解率的影响较小，但初始pH值的增加会提高发酵过程中CH₄的产率，降低CO₂的产率，提高产气中CH₄含量。因此确定初始pH值=13时污泥沼渣破解液产甲烷效果最好，此时COD去除率为61.1%，CH₄产率达到65.0 mL/g VSS，产气中CH₄含量能够达到81.0%。该研究证明热碱处理可提高污泥沼渣的可生化性，具有应用于厌氧发酵产甲烷的潜力。
- 污泥沼渣 /
- 热碱水解 /
- 溶出率 /
- 厌氧消化 /
- 甲烷产率
Abstract: To recover and reuse the organic matter in sewage sludge digestate, this work adopted alkaline-thermal hydrolysis to treat the digestate, exploring the effects of different conditions on its disintegration and organics dissolution efficiency. The optimal conditions for alkaline-thermal hydrolysis of sewage sludge digestate were determined as pH=13, T=80℃, and t=8 h. Under these conditions, the disintegration efficiency of sewage sludge digestate achieved 40.9%, with the dissolution efficiency of COD, protein, and polysaccharide of 722.2, 79.7, and 73.7 mg/g VSS, respectively. The sewage sludge digestate after alkaline-thermal hydrolysis was used as substrates for anaerobic fermentation to produce methane. The effect of initial pH on anaerobic fermentation was further investigated. It was found that the best methane yield was achieved at the initial pH of 13, and the COD removal efficiency was 61.1% with a methane yield of 65.0 mL/g VSS and a methane proportion of 81.0% in the produced biogas. This work confirms that alkaline-thermal hydrolysis can improve the biodegradability of sewage sludge digestate, and its potential in producing methane through anaerobic fermentation.
- sewage sludge digestate /
- alkaline-thermal hydrolysis /
- dissolution efficiency /
- anaerobic digestion /
- methane yield

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