铁碳材料促进污泥资源化回收中链羧酸

谢云龙; 刘孟飞; 高丽慧; 杨培娴

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (6) : 3171-3179.

水污染与控制

铁碳材料促进污泥资源化回收中链羧酸

谢云龙, 刘孟飞, 高丽慧, 杨培娴

作者信息 +

Enhancing medium-chain carboxylic acids production from sludge resource recovery via iron-carbon materials

XIE Yun-long, LIU Meng-fei, GAO Li-hui, YANG Pei-xian

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摘要

本研究采用梯度投加零价铁-石墨复合材料的实验方法(0~4.0g/L),探究铁碳材料对污泥碳链延长(CE)发酵系统调控机制.通过监测发酵系统中短链羧酸(SCCAs)与中链羧酸(MCCAs)浓度动态、复合有机物分解代谢情况、电子传递效率及微生物群落结构演变,系统解析铁碳材料对CE过程的促进作用.结果表明,铁碳材料投加量为0.5g/L时,MCCAs产量达到10.65g/L,是空白组的2.04倍,己酸选择性提升至53.60%(较空白组提高24.96%).机理研究表明,铁碳材料对厌氧发酵各阶段(增溶、水解、酸化)产生影响,驱动了有机物的分解代谢,并提升了多糖向短链羧酸的转化效率;同时显著提升电子传递活性.微生物群落分析进一步揭示,铁碳材料提高了厚壁菌门(Firmicutes)及狭义梭菌属12(Clostridium sensu stricto12)的相对丰度,促进了污泥厌氧发酵的水解和CE过程.研究证实了铁碳材料对污泥厌氧发酵生产MCCAs具有一定的促进作用.

Abstract

This study investigated the regulatory mechanisms of zero-valent iron-graphite composite materials (0~4.0g/L) on sludge fermentation via chain elongation(CE) systems through a gradient dosing approach. The enhancement of iron-carbon materials on the CE process were systematically analyzed by monitoring the variations of short-chain carboxylic acids (SCCAs) and medium-chain carboxylic acids (MCCAs) concentrations, decomposition and metabolism of organics, electron transfer efficiency, and evolution of microbial community structure. The results demonstrated that the MCCAs production reached 10.65g/L at an iron-carbon dosage of 0.5g/L, representing a 2.04-fold increasement compared to the control group. The selectivity of caproic acid reached 53.60%, enhanced by 24.96% compared to the control. Mechanistic studies revealed that iron-carbon materials influenced the three stages of anaerobic fermentation (solubilization, hydrolysis, and acidification), promoting the decomposition and metabolism of organics and the conversion of polysaccharides to SCCAs. Simultaneously, a significant enhancement in electron transfer activity was observed in the groups with iron-carbon addition. Microbial community analysis further indicated that iron-carbon materials increased the relative abundance of the phylum Firmicutes and the genus Clostridium sensu stricto 12, which facilitated hydrolysis and CE processes in anaerobic fermentation. This study suggested that the application of iron-carbon materials could enhance MCCAs production in sludge anaerobic fermentation systems.

导出引用

谢云龙, 刘孟飞, 高丽慧, 杨培娴. 铁碳材料促进污泥资源化回收中链羧酸[J]. 中国环境科学. 2025, 45(6): 3171-3179

XIE Yun-long, LIU Meng-fei, GAO Li-hui, YANG Pei-xian. Enhancing medium-chain carboxylic acids production from sludge resource recovery via iron-carbon materials[J]. China Environmental Science. 2025, 45(6): 3171-3179

中图分类号： X705

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