预处理协同合成气强化剩余污泥发酵产酸效能及机理

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摘要为提升污泥厌氧发酵产酸效能,在已证实合成气的参与能提升污泥发酵效能基础上,考察了不同化学预处理联合合成气介导污泥发酵体系的影响.结果表明,游离亚硝酸盐联合过氧乙酸(FNA/PAA)实验组的短链脂肪酸(SCFAs)产量最高((5520.20±204.99)mgCOD/L);然而,FNA/PAA组仅50.4%和35.8%的H₂和CO利用率,热碱预处理(TAP)实验组能有效利用合成气(H2利用率99.8%;CO利用率95.8%),且SCFAs产量达到(4663.67±163.86)mgCOD/L.三维荧光光谱结果表明:TAP组具备更优的剥离胞外聚合物及剩余污泥溶胞效能,同时该实验组实现了厌氧发酵进程中产酸功能菌群的高度富集,Firmicutes占比高达59.0%.此外,能够代谢合成乙酸、乙醇和H₂的Romboutsia菌属在碱预处理(AP)和TAP组中占比最高,分别为19.2%和21.3%.

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	谭慧杰
	于德林
	李沈卓
	段燕青
	魏瑶丽
	周爱娟
	岳秀萍

关键词 ：剩余污泥, 预处理, 合成气, 厌氧发酵, 短链脂肪酸

Abstract：To enhance the acid production efficiency of sludge anaerobic fermentation, based on the established evidence that the inclusion of syngas improved waste activated sludge (WAS) fermentation performance, this study investigated the effects of different chemical pretreatments combined with a syngas-mediated WAS fermentation system. The results showed that the free nitrous acid combined with peracetic acid (FNA/PAA) experimental group had the highest production of short-chain fatty acids (SCFAs) ((5520.20 ±204.99) mg COD/L). However, the FNA/PAA group exhibited only 50.4% and 35.8% utilization rates for H₂and CO, respectively. In contrast, the TAP group demonstrated efficient utilization of syngas, with H2and CO utilization rates reaching 99.8% and 95.8%, respectively. Moreover, the production of SCFAs in the TAP group achieved a significant level of (4663.67 ±163.86) mg COD/L. At the same time, the three-dimensional fluorescence spectrum showed that TAP group had better extracellular polymer stripping and WAS lysis efficiency. TAP group also enhanced the enrichment of acid-producing functional bacteria in the anaerobic fermentation process, and significantly increased the abundance of Firmicutes to 59.0%. In addition, Romboutsia, which can metabolize acetic acid, ethanol and H₂, accounted for the highest proportion in alkali pretreatment (AP) and TAP groups (19.2% and 21.3%).

Key words： waste activated sludge(WAS) pretreatment syngas anaerobic fermentation short-chain fatty acids(SCFAs)

收稿日期: 2024-09-20

PACS:

X705

基金资助:国家自然科学基金资助项目(52470156,52070139)

作者简介: 谭慧杰(1976-),男,山西晋城人,太原理工大学博士研究生,主要从事废弃生物质资源化利用研究.发表论文5篇.tanhuijie0033@link.tyut.edu.cn.

引用本文:

谭慧杰, 于德林, 李沈卓, 段燕青, 魏瑶丽, 周爱娟, 岳秀萍. 预处理协同合成气强化剩余污泥发酵产酸效能及机理[J]. 中国环境科学, 2025, 45(5): 2577-2586. TAN Hui-jie, YU De-lin, LI Shen-zhuo, DUAN Yan-qing, WEI Yao-li, ZHOU Ai-juan, YUE Xiu-ping. Performance and mechanisms of short-chain fatty acids production from waste activated sludge fermentation enhanced by pretreatment synergistic syngas. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(5): 2577-2586.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I5/2577

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