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Effects of different hypochlorite types on the waste activated sludge fermentation from the perspectives of volatile fatty acids production, microbial community and activity, and characteristics of fermented sludge
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-03-23 , DOI: 10.1016/j.biortech.2020.123227
Jingyang Luo , Wenxuan Huang , Qin Zhang , Wen Guo , Yang Wu , Qian Feng , Fang Fang , Jiashun Cao , Yinglong Su

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.



中文翻译:

从挥发性脂肪酸的产生,微生物群落和活性以及发酵污泥的特性的角度来看,不同次氯酸盐类型对废活性污泥发酵的影响

研究了不同类型的次氯酸盐(即Ca(OCl)2和NaOCl)对废物活性污泥(WAS)厌氧发酵的影响,以及微生物群落和活性。结果表明,Ca(OCl)2和NaOCl都通过同时增强溶解,水解和酸化过程来促进挥发性脂肪酸(VFA)的产生。在最佳剂量的NaOCl和Ca(OCl)2下,最大VFA分别为1379.5(在10 d时)和1621.5(在8 d)时的COD / L,而仅在15 d(在6 d)时,COD / L仅为157.4 mg。控制。但是,Ca(OCl)2NaOCl相对短暂时,可能以连续模式影响厌氧过程,这对微生物的结构和活性以及随后在WAS发酵系统中产生VFA产生了显着影响。而且,Ca(OCl)2处理在WAS脱水和VSS减少方面显示出优于NaOCl的优势,这表明利用Ca(OCl)2作为WAS处理添加剂的优势。

更新日期:2020-03-24
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