Activation of peroxymonosulfate by sewage sludge-derived biochar to promote short-chain fatty acid production during sludge anaerobic fermentation

化学 活性污泥 发酵 厌氧消化 水解 污水污泥 中层 丙酸盐 生物炭 污水处理 食品科学 制浆造纸工业 废物管理 热解 细菌 生物化学 甲烷 有机化学 生物 工程类 遗传学
作者
Jinling He,Qing‐Chen Wu,Nan Jiang,Zhang Ai,Lin Wang,Xiang Li,Gang Xue,Hong Chen,Pin Gao
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:480: 148041-148041 被引量:10
标识
DOI:10.1016/j.cej.2023.148041
摘要

This study reports on the potential use of sewage sludge-derived biochar (SBC) as an activator for peroxymonosulfate (PMS) to improve the solubilization of waste activated sludge (WAS) and the production of short-chain fatty acids (SCFAs) during anaerobic digestion. The SBC produced by pyrolysis of WAS has active sites consisting of metals species and C = O groups, which can effectively activate PMS. SBC-activated PMS (PMS/SBC) can destroy cellular structures in WAS and release large amounts of organic matter, increasing the rate of hydrolysis and promoting subsequent SCFA production. Compared with the control, PMS/SBC treatment increased SCFA production by 801 % at a PMS dose of 0.14 g/g VSS (volatile suspended solids) and SBC dose of 0.24 g/g VSS. Moreover, PMS/SBC could degrade refractory organic pollutants in WAS (sulfamethoxazole removal efficiency >63 %), improving SCFA quality. Mechanistic investigations revealed that SBC activates PMS to produce •SO4−, 1O2, and •OH. The contributions of these species to sludge solubilization were 1O2 > •OH > •SO4−, with surface-bound radicals on SBC playing major roles. In addition, PMS/SBC treatment enriched hydrolysis and SCFA-forming bacteria and increased the expression of key genes for SCFA production during sludge anaerobic fermentation, which also contributed to SCFA accumulation. This work provides new insights into the mechanism of SBC activation of PMS and its potential applications in WAS resource utilization.
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