Effects of pH Adjustment on the Release of Carbon Source of Particulate Organic Matter (POM) in Domestic Sewage

Lei Zhu, Jiahou Hao, Houwei Lai and Guibai Li
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Lei Zhu: School of Environment, Harbin Institute of Technology, Harbin 150090, China
Jiahou Hao: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Houwei Lai: South China Institute of Environmental Science, Ministry of Ecology and Environment (MEE), Guangzhou 510655, China
Guibai Li: School of Environment, Harbin Institute of Technology, Harbin 150090, China

Sustainability, 2022, vol. 14, issue 13, 1-15

Abstract: The use of anaerobic hydrolytic fermentation to develop more available carbon sources from domestic sewage influent particulate organic matter (POM) has received increasing attention. However, the slow hydrolysis rate of POM limits the application of this technology. This study aimed to improve the carbon source release efficiency of POM by pH adjustment and to reveal the hydrolysis mechanism. Results showed that adjusting the initial pH of POM to 3, 9, and 11 enhanced carbon source release in the anaerobic hydrolysis fermentation process of POM. The pretreatment under pH value of 11 contributed to the highest yield and productivity of carbon source, reaching the soluble chemical oxygen demand (SCOD) of 2782 mg/L at the 4th day. The pH 3 pretreatment was more beneficial for phosphorus resource recovery, which contributed to the highest release concentration of PO 4 3− -P, reaching 48.2 mg/L at the 3rd day, accounting for 90% of TP. Microbial community structure analysis indicated that pH 11 preconditioning promoted the enrichment of proteolytic bacteria ( Proteocatella and Proteiniclasticum ) and polysaccharide hydrolytic bacteria ( Trichococcus and Acinetobacter ) and inhibited the growth of acetate-consuming methanogenic archaea, which contributed to the highest carbon release of POM in domestic sewage.

Keywords: domestic sewage; particulate organic matter; pH adjustment; carbon source release; hydrolysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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