不同初始pH值下磷钼酸对剩余污泥厌氧发酵产酸的影响

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摘要磷钼酸作为一种绿色的强氧化剂,可以促进剩余污泥(WAS)厌氧发酵产酸过程中的水解阶段并能有效抑制产甲烷菌群,但其与pH值调节共同作用对挥发性脂肪酸(VFAs)的产生情况仍然未知.本研究提出调控初始pH值(7,8,9,10)以优化磷钼酸预处理下的WAS厌氧发酵产酸的方法,结果表明,提高初始pH值有利于污泥有机质的溶出,可与磷钼酸共同促进VFAs的产生.特别在初始pH=10时,最大VFAs的产量(1588.7mg COD/L)是未调控初始pH值(778.1mg COD/L)时的2.0倍,乙酸含量占比更是达到了48.7%.综上,磷钼酸与碱性条件对污泥厌氧发酵过程起联合协同促进作用,对提高VFAs产量具有一定的可行性.

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	江潭
	王博
	李笑迪
	马雨晴

关键词 ：剩余污泥(WAS), 挥发性脂肪酸, 磷钼酸, 厌氧发酵

Abstract：Phosphomolybdic acid, a green and strong oxidant, can not only promote the hydrolysis in the process of anaerobic fermentation of waste activated sludge (WAS), but also inhibit the methanogenic microorganisms effectively, but the specific role of phosphomolybdic acid along with pH adjustment on the production of volatile fatty acids (VFAs) is still unknown. This study proposed a method to optimize the anaerobic fermentation of WAS by controlling the initial pH (7, 8, 9, 10) and phosphomolybdic acid. Results showed that increasing the initial pH and dosing phosphomolybdic acid were beneficial to the release of organic matter from WAS, which promoted the production of volatile fatty acids (VFAs). Especially when the initial pH was 10, the maximum VFAs production (1588.7mg COD/L) was 2.0 times that of the unregulated initial pH (778.1mg COD/L), and the proportion of acetic acid reached 48.7%. Therefore, phosphomolybdic acid and alkaline condition played a synergistic effect on the anaerobic fermentation process, for which the production of VFAs could be increased.

Key words： waste activated sludge(WAS) volatile fatty acids phosphomolybdic acid anaerobic fermentation

收稿日期: 2022-08-23

PACS:

X703

基金资助:北京市自然科学基金资助项目(8212022);国家自然科学基金资助项目(22176007);山东省重点研发计划项目(2021CXGC011202,2020CXGC011404)

通讯作者: 王博,副教授,wbo@bjut.edu.cn E-mail: wbo@bjut.edu.cn

作者简介: 江潭(1998-),男,安徽淮南人,北京工业大学硕士研究生,主要从事污水生物处理及污泥资源化利用.15956465673@163.com.

引用本文:

江潭, 王博, 李笑迪, 马雨晴. 不同初始pH值下磷钼酸对剩余污泥厌氧发酵产酸的影响[J]. 中国环境科学, 2023, 43(4): 1628-1635. JIANG Tan, WANG Bo, LI Xiao-di, MA Yu-qing. Effect of phosphomolybdic acid pretreatment at different initial pH on acid production from waste activated sludge in anaerobic fermentation. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1628-1635.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I4/1628

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