4.8 Article

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

期刊

BIORESOURCE TECHNOLOGY
卷 332, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125112

关键词

Waste activated sludge; Anaerobic digestion; Methane; Potassium ferrate; Freezing pretreatment

资金

  1. National Natural Science Foundation of China [51676141, 52076152]
  2. Natural Science Foundation of Shanghai [20ZR1461000]
  3. Overseas HighLevel Talents Program of Sichuan Province [2021JDGD008]
  4. Fundamental Research Funds for the Central Universities

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This study proposed a novel sludge pretreatment technology by combining freezing with potassium ferrate (PF) to enhance methane yield from sludge anaerobic digestion. Experimental results showed a significant increase in methane production and hydrolysis rate after the combined pretreatment, effectively disrupting microbial structure in sludge.
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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