Journal
BIORESOURCE TECHNOLOGY
Volume 307, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123227
Keywords
Hypochlorite types; Waste activated sludge (WAS); Anaerobic fermentation; Volatile fatty acids (VFAs); Microbial community; Dewatering
Funding
- National Natural Science Foundation of China [51708171, 41807462, 51878243]
- China Postdoctoral Science Foundation [2018M630508, 2019T120387]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China
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The effects of different hypochlorite types (namely Ca(OCl)(2) and NaOCl) on the waste activated sludge (WAS) anaerobic fermentation, and microbial community and activity were investigated. The results indicated that both Ca(OCl)(2) and NaOCl contributed to volatile fatty acids (VFAs) production by simultaneously enhancing the solubilization, hydrolysis and acidification processes. The maximal VFAs was respectively 1379.5 (at 10 d) and 1621.5 (at 8 d) mg COD/L at the optimal dose of NaOCl and Ca(OCl)(2) while it was merely 157.4 (at 6 d) mg COD/L in the control. However, the Ca(OCl)(2) might affect the anaerobic process in a continuous mode while the NaOCl was relatively transient, which caused distinctive influences on the microbial structure and activity, and subsequently VFAs production in WAS fermentation systems. Moreover, Ca(OCl)(2) treatments showed advantages over NaOCl on WAS dewatering and VSS reduction, implying the superiority of utilizing Ca(OCl)(2) as additives for WAS disposal.
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