Issue 10, 2021
From the journal:

Environmental Science: Water Research & Technology

Acute impacts of mixed heavy metals and diclofenac on sludge activity and enzyme activity involved with biological nitrogen removal†

Yueyue Wang,a   Zichao Wang, ORCID logo *a   Huan Yang,a   Shengyu Yuan,a   Youtao Song,a   Lin Wangb  and  Lu Zhangb  

* Corresponding authors

a College of Environment Science, Liaoning University, No. 66 Chongshan Central Road, Shenyang, Liaoning Province 110036, China
E-mail: wangzichao10@sina.com
Fax: +86 411 62204818
Tel: +86 24 62204818

b College of Environment and Chemical Engineering, Dalian University, Dalian, China

Abstract

The acute impacts of mixed heavy metals and diclofenac (DCF) on sludge activity and enzyme activity involved with nitrogen removal were investigated. Synergistic inhibition on sludge activity and enzyme activity of nitrification and denitrification was found between divalent copper and DCF, and the inhibition by mixed hexavalent chromium and DCF was antagonistic. Joint divalent zinc and DCF had synergistic effects on sludge activity and enzyme activity in the nitrification process, and they showed antagonistic inhibitions on denitrifying sludge activity and enzyme activity. Metals, DCF and mixed metals/DCF excited reactive oxygen species and lactate dehydrogenase production from activated sludge. Protein in extracellular polymeric substances (EPS) was the main feedback of bacteria to metals, DCF and mixed metals/DCF, and the protein role did not change according to the type of metal or mixture composition. Protein and polysaccharide groups played important roles in the interaction of EPS with metals and DCF.

Graphical abstract: Acute impacts of mixed heavy metals and diclofenac on sludge activity and enzyme activity involved with biological nitrogen removal

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Article information

DOI
https://doi.org/10.1039/D1EW00359C
Article type
Paper
Submitted
27 May 2021
Accepted
13 Aug 2021
First published
20 Aug 2021

Environ. Sci.: Water Res. Technol., 2021,7, 1852-1860

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Acute impacts of mixed heavy metals and diclofenac on sludge activity and enzyme activity involved with biological nitrogen removal

Y. Wang, Z. Wang, H. Yang, S. Yuan, Y. Song, L. Wang and L. Zhang, Environ. Sci.: Water Res. Technol., 2021, 7, 1852 DOI: 10.1039/D1EW00359C

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