Potassium ferrate coupled with freezing method enhances methane production from sludge anaerobic digestion

被引：24
作者：
Hu, Jiawei [1 ]
Li, Zhuo [1 ]
Wu, Zhigen [1 ]
Tao, Wenquan [1 ]
机构：
[1] Tongji Univ, State Key Lab Pollut Control & Resource Reuse,Col, Int Joint Res Ctr Sustainable Urban Water Syst, Key Lab CitiesMitigat & Adaptat Climate Change Sh, 1239 Siping Rd, Shanghai 200092, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2021年 / 332卷
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
Waste activated sludge; Anaerobic digestion; Methane; Potassium ferrate; Freezing pretreatment; WASTE ACTIVATED-SLUDGE; FATTY-ACIDS PRODUCTION; SEWAGE-SLUDGE; GEN; NOV; PRETREATMENT; DEWATERABILITY; FERMENTATION; DISINTEGRATION; MECHANISM;
D O I：
10.1016/j.biortech.2021.125112
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
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.
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页数：8
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