高铁酸钾耦合冷冻法提高污泥厌氧消化产甲烷量。
Potassium ferrate coupled with freezing method enhances methane production from sludge anaerobic digestion.
作者信息
Hu Jiawei, Li Zhuo, Wu Zhigen, Tao Wenquan
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, International Joint Research Center for Sustainable Urban Water System, Key Laboratory of Cities' Mitigation and Adaptation to Climate Change in Shanghai, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resource Reuse, International Joint Research Center for Sustainable Urban Water System, Key Laboratory of Cities' Mitigation and Adaptation to Climate Change in Shanghai, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
出版信息
Bioresour Technol. 2021 Jul;332:125112. doi: 10.1016/j.biortech.2021.125112. Epub 2021 Apr 6.
This study proposed a novel sludge pretreatment technology by combining freezing with potassium ferrate (PF) for synergistically enhancing the methane yield from sludge anaerobic digestion. Experimental results showed that the methane production was promoted from 170.1 ± 5.6 to 223.8 ± 7.0 mL/g VSS (volatile suspended solids) when pretreated by freezing coupled with 0.05 g/g TSS (total suspended solids) PF, with 31.6% increase. Kinetic model analysis indicated that the methane production potential and hydrolysis rate of sludge after combined pretreatment were enhanced by 32.0% and 15.0%, respectively. Mechanism studies revealed that freezing coupled with PF pretreatment effectively disrupted both extracellular polymeric substances (EPS) and microbial cells in sludge, consequently resulted in violent sludge disintegration. All the microbes responsible for hydrolysis, acidification and methanogenesis were found to be enriched by co-treatment of freezing and PF. Moreover, the fecal coliform in pretreated sludge was largely inactivated after anaerobic digestion.
本研究提出了一种将冷冻与高铁酸钾（PF）相结合的新型污泥预处理技术，以协同提高污泥厌氧消化的甲烷产量。实验结果表明，当采用冷冻结合0.05 g/g总悬浮固体（TSS）的PF进行预处理时，甲烷产量从170.1±5.6 mL/g挥发性悬浮固体（VSS）提高到223.8±7.0 mL/g VSS，提高了31.6%。动力学模型分析表明，联合预处理后污泥的甲烷生产潜力和水解速率分别提高了32.0%和15.0%。机理研究表明，冷冻与PF预处理相结合有效地破坏了污泥中的胞外聚合物（EPS）和微生物细胞，从而导致污泥剧烈解体。通过冷冻和PF的联合处理，发现所有负责水解、酸化和产甲烷的微生物都得到了富集。此外，预处理污泥中的粪大肠菌群在厌氧消化后大部分失活。
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