反硝化
环境修复
毒性
生物修复
细胞内
化学
环境化学
铬
核化学
污染
氮气
生物
生态学
生物化学
有机化学
作者
Qian Wang,Yingxin Zhao,Yinuo Liu,Chenggong Zhang,Bibek Bamanu,Yichen Wu,Chunfang Chao,Yiwen Liu,Yindong Tong,Marjangul Nuramkhaan
出处
期刊:Water Research
[Elsevier]
日期:2024-01-30
卷期号:252: 121230-121230
被引量:4
标识
DOI:10.1016/j.watres.2024.121230
摘要
Although the biotoxicity of heavy metals has been widely studied, there are few reports on the recovery strategy of the inhibited bio-system. This study proposed a combined promoter-I (Primary promoter: l-cysteine, biotin, and cytokinin + Electron-shuttle: PMo12) to recover the denitrification suppressed by Cr(VI). Compared with self-recovery, combined promoter-I shortened the recovery time of 28 cycles, and the recovered reactor possessed more stable long-term operation performance with >95 % nitrogen removal. The biomass increased by 7.07 mg VSS/(cm3 carrier) than self-recovery due to the promoted bacterial reproduction, thereby reducing the toxicity load of chromium per unit biomass. The combined promoter-I strengthened the toxicity remediation by promoting 92.84 % of the intracellular chromium release and rapidly activating anti-oxidative stress response. During toxicity remediation, ROS content quickly decreased, and the PN/PS value was 2.27 times that of self-recovery. PMo12 relieved Cr(VI) inhibition on NO3−-N reduction by increasing NAR activity. The enhanced intracellular and intercellular electron transmission benefited from the stimulated NADH, FMN, and Cyt.c secretion by the primary promoter and the improved transmembrane electron transmission by Mo. PMo12 and the primary promoter synergized in regulating community structure and improving microbial richness. This study provided practical approaches for microbial toxicity remediation and maintaining high-efficiency denitrification.
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