The emergence of triclosan (TCS) in the environment has caused extensive concern, but its role in waste activated sludge (WAS) anaerobic fermentation (AF) is still uncertain. This work investigated the impact of TCS on volatile fatty acids (VFAs) recycling from WAS. The results showed that TCS of 200 mg/kg TSS increased the maximum VFA accumulation from 7284 to 15,083 mg COD/L. The increase in total VFA production is attributed to the massive increase in acetic acid. Mechanism exploration showed that TCS promotes WAS solubilization by facilitating cell breakage and extracellular polymeric substances disruption, and stimulates AF by enhancing the activity of key enzymes among all stages. TCS promotes acidification stronger than methanogenesis, which makes VFA production faster than consumption, leading to increased VFA accumulation. These findings provide novel insights for revealing the role of TCS in WAS resource recovery, and offer thoughts for the selective production of final recycling products of TCS-containing WAS.

三氯生（TCS）在环境中的出现引起了广泛关注，但其在废物活性污泥（WAS）厌氧发酵（AF）中的作用仍不确定。这项工作研究了TCS对WAS中挥发性脂肪酸（VFA）回收的影响。结果表明，TCS为200 mg / kg TSS时，最大VFA累积量从7284增加到15,083 mg COD / L。VFA总产量的增加归因于乙酸的大量增加。机制探索表明，TCS通过促进细胞破裂和细胞外聚合物质破坏来促进WAS增溶，并通过在所有阶段增强关键酶的活性来刺激AF。TCS促进酸化作用比甲烷生成作用更强，这使VFA生产快于消耗，导致VFA积累增加。