Regulation methods and enhanced mechanism on the efficient degradation of aromatics in biochemical treatment system of coal chemical wastewater

Hui Tang; Yongjun Liu; Xingshe Liu; Aining Zhang; Rushuo Yang; Yulu Han; Pan Liu; Hao Bo He; Zhihua Li

doi:10.1016/j.jenvman.2023.119358

Regulation methods and enhanced mechanism on the efficient degradation of aromatics in biochemical treatment system of coal chemical wastewater

J Environ Manage. 2023 Dec 15:348:119358. doi: 10.1016/j.jenvman.2023.119358. Epub 2023 Oct 25.

Authors

Hui Tang¹, Yongjun Liu², Xingshe Liu¹, Aining Zhang¹, Rushuo Yang¹, Yulu Han¹, Pan Liu¹, Hao Bo He¹, Zhihua Li³

Affiliations

¹ School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China.
² School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
³ School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, 710055, China. Electronic address: liuyongjun@xauat.edu.cn.

PMID: 37890402
DOI: 10.1016/j.jenvman.2023.119358

Abstract

In order to address the problems of poor treatment effect of coal chemical wastewater (CCW) biochemical treatment system resulting in non-compliance with effluent standards and unstable operation, a combination regulation method of co-substrate metabolism and predominant flora enhancement was constructed, and the performance and mechanism of enhanced degradation of aromatics in CCW was also investigated in this study. The results showed that when the influent concentration of chemical oxygen demand (COD) and aromatics was less than 600 mg/L and 180 mg/L respectively, there was no significant effect of the combined regulation method on the enhanced treatment of aromatics, the removal rate of total organic carbon (TOC) in the system could all more than 73%; while when the influent concentration of COD increased to 800 mg/L and the aromatics concentration increased to more than 240 mg/L, the ordinary activated sludge system had collapsed. Compared with the regulation method of co-substrate metabolism alone, the combination regulation method increased the removal rate of TOC by 21%. The analysis of antioxidant enzyme activity showed that under the combination regulation method, the antioxidant enzyme activity of microorganisms was higher and their resistance to adverse environments was stronger. EPS and dehydrogenase analysis indicated that the combination regulation method was more conducive to microbial degradation of aromatics. Meanwhile, the analysis of microbial community structure showed that the aromatics degradation bacteria genera Rhodococcus, Luteococcus, etc. were enriched under the combination regulation method. The study provides a theoretical basis and technical guidance for solving the problems of unstable operation of CCW biochemical treatment systems and non-compliance with effluent standards.

Keywords: Aromatics; Bioaugmentation; Biochemical treatment system; Coal chemical wastewater; Metabolic regulation.

MeSH terms

Antioxidants
Bioreactors
Coal
Sewage / chemistry
Waste Disposal, Fluid* / methods
Wastewater*

Substances

Wastewater
Coal
Antioxidants
Sewage