Thiourea is a typical nitrification inhibitor that shows a strong inhibitory effect against the biological nitrification process. The 50% inhibitory concentration (IC50) of thiourea on nitrification was determined to be 0.088 mg g VSS−1, and nitrifiers recovered from the thiourea inhibition after it was completely degraded. The thiourea-degrading ability of the sludge system was improved to 3.06 mg gVSS−1 h−1 through cultivation of thiourea-degrading bacteria by stepwise increasing the influent thiourea concentration. The dominant thiourea-degrading bacteria strain that used thiourea as the sole carbon and nitrogen source in the sludge system was identified as Pseudomonas sp. NCIMB. The results of this study will facilitate further research of the biodegradation characteristics of thiourea and similar pollutants.
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Research Article|
March 24 2017
Inhibitory effect of thiourea on biological nitrification process and its eliminating method
Yuan Wang;
Yuan Wang
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control of Chemical Processes, Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
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Xibiao Jin;
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control of Chemical Processes, Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
E-mail: xbjin@ecust.edu.cn
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Lijun He;
Lijun He
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control of Chemical Processes, Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
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Wei Zhang
Wei Zhang
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control of Chemical Processes, Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
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Water Sci Technol (2017) 75 (12): 2900–2907.
Article history
Received:
November 08 2016
Accepted:
March 09 2017
Citation
Yuan Wang, Xibiao Jin, Lijun He, Wei Zhang; Inhibitory effect of thiourea on biological nitrification process and its eliminating method. Water Sci Technol 28 June 2017; 75 (12): 2900–2907. doi: https://doi.org/10.2166/wst.2017.177
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