TY - JOUR
T1 - Evaluation of Zinc Oxide Nanoparticles-Induced Effects on Nitrogen and Phosphorus Removal from Real and Synthetic Municipal Wastewater
AU - Zheng, Xiong
AU - Yang, Lan
AU - Shen, Qiuting
AU - Zhou, Chen
N1 - Funding Information:
This contribution was identified by Bin Cao (Nanyang Technological University) as the Best Presentation in the “ENVR 248” session of the 2018 ACS Fall National Meeting in Boston. This work was financially supported by the National Science Foundation of China (51778450 and 51578394) and the Chenguang Program of Shanghai Education Development Foundation (15CG17).
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/5/15
Y1 - 2019/5/15
N2 - The wide utilization of zinc oxide nanoparticles (ZnO NPs) in many products could cause their release into wastewater treatment plants. Although the potential effects of ZnO NPs on synthetic wastewater treatment have been studied, reports concerning their impacts on biological nitrogen (N) and phosphorus (P) removal from real wastewater are sparse, and the related mechanisms of these effects are still unclear. In this study, the influences of ZnO NPs on nitrogen and phosphorus removal from real municipal wastewater were investigated, and the results were compared with those using synthetic wastewater. The data showed that 50 mg/L ZnO NPs did not affect the settleability and membrane integrity of activated sludge fed with real or synthetic wastewater. Although the deterioration of N and P removal from both wastewaters was observed, the ZnO NPs-induced inhibition to real wastewater treatment was smaller than that to synthetic wastewater treatment (36% versus 100% inhibition to phosphorus removal). Fluorescence excitation-emission matrix (EEM) analysis showed that the real wastewater contained higher dissolved organic matters such as humic substances than the synthetic one. The presence of dissolved organic matter decreased the dissolution of ZnO NPs, which could lower the ZnO NPs-induced negative effects on biological N and P removal from real wastewater. Further experiments revealed that ZnO NPs showed smaller inhibition to the catalytic activities of nitrate reductase, exopolyphosphatase, and polyphosphate kinase of activated sludge cultured by real wastewater, which was another reason for the lower influence of ZnO NPs on biological N and P removal from real wastewater.
AB - The wide utilization of zinc oxide nanoparticles (ZnO NPs) in many products could cause their release into wastewater treatment plants. Although the potential effects of ZnO NPs on synthetic wastewater treatment have been studied, reports concerning their impacts on biological nitrogen (N) and phosphorus (P) removal from real wastewater are sparse, and the related mechanisms of these effects are still unclear. In this study, the influences of ZnO NPs on nitrogen and phosphorus removal from real municipal wastewater were investigated, and the results were compared with those using synthetic wastewater. The data showed that 50 mg/L ZnO NPs did not affect the settleability and membrane integrity of activated sludge fed with real or synthetic wastewater. Although the deterioration of N and P removal from both wastewaters was observed, the ZnO NPs-induced inhibition to real wastewater treatment was smaller than that to synthetic wastewater treatment (36% versus 100% inhibition to phosphorus removal). Fluorescence excitation-emission matrix (EEM) analysis showed that the real wastewater contained higher dissolved organic matters such as humic substances than the synthetic one. The presence of dissolved organic matter decreased the dissolution of ZnO NPs, which could lower the ZnO NPs-induced negative effects on biological N and P removal from real wastewater. Further experiments revealed that ZnO NPs showed smaller inhibition to the catalytic activities of nitrate reductase, exopolyphosphatase, and polyphosphate kinase of activated sludge cultured by real wastewater, which was another reason for the lower influence of ZnO NPs on biological N and P removal from real wastewater.
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U2 - 10.1021/acs.iecr.9b00641
DO - 10.1021/acs.iecr.9b00641
M3 - Article
AN - SCOPUS:85065883653
SN - 0888-5885
VL - 58
SP - 7929
EP - 7936
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 19
ER -