Diclofenac inhibited the biological phosphorus removal: Performance and mechanism

This work aims to evaluate the effect of new contaminant diclofenac (DCF) in sewage on the performance of Enhanced Biological Phosphorus Removal (EBPR) and its mechanism. The results showed that low-level DCF had no significant effect on EBPR. However, when the concentration of DCF was 2.0 mg/L, the...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2020-03, Vol.243, p.125380, Article 125380
Main Authors: Zhao, Jianwei, Xin, Mingxue, Zhang, Jing, Sun, Yingjie, Luo, Siyi, Wang, Huawei, Wang, Yanan, Bi, Xuejun
Format: Article
Language:English
Subjects:
Biological Oxygen Demand Analysis
Bioreactors
Diclofenac
Diclofenac - pharmacology
Enhanced biological phosphorus removal
Oxic phosphorus uptake
Phosphates - analysis
Phosphates - isolation & purification
Phosphorus - chemistry
Phosphorus - isolation & purification
Phosphorus - pharmacokinetics
Polyhydroxyalkanoates
Polyhydroxyalkanoates - analysis
Sewage - chemistry
Waste Disposal, Fluid - methods
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Summary:This work aims to evaluate the effect of new contaminant diclofenac (DCF) in sewage on the performance of Enhanced Biological Phosphorus Removal (EBPR) and its mechanism. The results showed that low-level DCF had no significant effect on EBPR. However, when the concentration of DCF was 2.0 mg/L, the removal efficiencies of chemical oxygen demand (COD), NH4+-N and soluble orthophosphate (SOP) decreased significantly to 71.2 ± 4.2%, 78.6 ± 2.9%, and 64.3 ± 4.2%, respectively. Mechanisms revealed that DCF promoted the ratio of protein to polysaccharide in activated sludge extracellular polymers and inhibited anaerobic phosphorus release and oxic phosphorus uptake. Intracellular polymer analysis showed that when the DCF content was 2.0 mg/L, the maximum content of polyhydroxyalkanoates (PHA) was only 2.5 ± 0.4 mmol-C/g VSS, which was significantly lower than that in the blank. Analysis of key enzyme activities indicated that the presence of DCF reduced the activities of exopolyphosphatase and polyphosphate kinase. [Display omitted] •DCF inhibited nutrient removal from EBPR systems.•DCF inhibited anaerobic phosphorus release and oxic phosphorus uptake.•DCF reduced the relative abundance of PAO but increased the relative abundance of GAO.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2019.125380