Regulating sludge composting with percarbonate facilitated the methylation and detoxification of arsenic mediated via reactive oxygen species.

Hongmei Yang, Xiaojing Chen, Ao Wang, Shuaipeng Liu, Xueling Liang, Heng Lu, Qunliang Li

Journal: Bioresource technology 2023;387():129674

PMID: 37586432

Full Text on Elsevier Science View on PubMed

Abstract

This study purposed to demonstrate the impact of reactive oxygen species (ROS) on arsenic detoxification mechanism in sludge composting with percarbonate. In this study, sodium percarbonate was used as an additive. Adding sodium percarbonate increased the content of HO and OH, which the experimental group (SPC) was higher than the control group (CK). In addition, it decreased the bioavailability of arsenic by 19.10%. Metagenomic analysis found that Firmicutes and Pseudomonas took an active part in the overall compost as the dominant bacteria of arsenic methylation. ROS positively correlated with arsenic oxidation and methylation genes (arsC, arsM), with the gene copy number of arsC and arsM increasing to 7.74 × 10, 5.24 × 10 in SPC. In summary, the passivation of arsenic could be achieved by adding percarbonate, which promoted the methylation of arsenic, reduced the toxicity of arsenic, and provided a new idea for the harmless management of sludge.

Address: School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.; School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China. Electronic address: [email protected].

DOI: 10.1016/j.biortech.2023.129674

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Full Text Sources:

https://linkinghub.elsevier.com/retrieve/pii/S0960...

MeSH Terms: Arsenic, Sewage, Reactive Oxygen Species, Composting, Methylation, Hydrogen Peroxide