Effects of CaO2 based Fenton - like reaction on heavy metals and microbial community during co-composting of straw and sediment

Yaoning Chen; Xinli Luo; Yuanping Li; Yihuan Liu; Li Chen; Hongjuan Jiang; Yanrong Chen; Xiaoli Qin; Ping Tang; Haoqin Yan

doi:10.1016/j.chemosphere.2022.134563

Effects of CaO₂ based Fenton - like reaction on heavy metals and microbial community during co-composting of straw and sediment

Chemosphere. 2022 Aug:301:134563. doi: 10.1016/j.chemosphere.2022.134563. Epub 2022 Apr 9.

Authors

Yaoning Chen¹, Xinli Luo², Yuanping Li³, Yihuan Liu², Li Chen², Hongjuan Jiang², Yanrong Chen⁴, Xiaoli Qin⁵, Ping Tang², Haoqin Yan²

Affiliations

¹ College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China. Electronic address: cyn@hnu.edu.cn.
² College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
³ College of Municipal and Mapping Engineering, Hunan City University, Yiyang, Hunan, 413000, China. Electronic address: yuanpingli@hncu.edu.cn.
⁴ School of Resource & Environment, Hunan University of Technology and Business, Changsha, 410205, China.
⁵ State Key Laboratory of Utilization of Woody Oil Resource and Institute of Biological and Environmental Engineering, Hunan Academy of Forestry, Changsha, 410004, China.

PMID: 35413365
DOI: 10.1016/j.chemosphere.2022.134563

Abstract

In this study, a Fenton-like system was constructed by CaO₂ and nano-Fe₃O₄ in the co-composting system of straw and sediment. Its effect on the passivation of heavy metals and the evolution of microbial community were investigated. The results showed that the establishment of CaO₂-Fenton-like system increased the residual Cu and residual Zn by 27.62% and 16.80%, respectively. In addition, the CaO₂-Fenton-like system facilitated the formation of humic acid (HA) up to 20.84 g·kg^-1. Redundancy analysis (RDA) showed that the CaO₂-Fenton-like system accelerated bacterial community succession and promoted the passivation of Cu and Zn. Structural equation models (SEMs) indicated that Fenton reaction affected Cu and Zn passivation by affecting pH, bacterial communities, and HA. This study shows that the CaO₂-Fenton-like system could promote the application of composting in the remediation of heavy metals contamination in sediment.

Keywords: Bacterial community; Calcium peroxide; Composting; Fenton-like system; Heavy metals.

MeSH terms

Bacteria
Composting*
Humic Substances / analysis
Metals, Heavy* / analysis
Microbiota*
Soil

Substances

Humic Substances
Metals, Heavy
Soil