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Long-term exposure of polytetrafluoroethylene-nanoplastics on the nitrogen removal and extracellular polymeric substances in sequencing batch reactor

Enzyme and Microbial Technology 2023 19 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Bing Wang Huan Yang, Bing Wang Yang Liu, Bing Wang Huan Yang, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Bing Wang Yaohui Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Bing Wang Yang Liu, Yueyue Wang, Yaohui Liu, Yang Liu, Yang Liu, Yang Liu, Changwei Niu, Yang Liu, Yang Liu, Zichao Wang, Yang Liu, Yang Liu, Zichao Wang, Yueyue Wang, Yang Liu, Yang Liu, Changwei Niu, Bing Wang Bing Wang Yang Liu, Yaohui Liu, Yang Liu, Liming Guo, Yang Liu, Yang Liu, Yaohui Liu, Yang Liu, Yang Liu, Bing Wang Zichao Wang, Liming Guo, Yang Liu, Zichao Wang, Bing Wang Zichao Wang, Zichao Wang, Zichao Wang, Bing Wang

Summary

Researchers investigated the long-term effects of polytetrafluoroethylene nanoplastics on nitrogen removal and extracellular polymeric substances in a sequencing batch reactor system. The study found that PTFE nanoplastics reduced the efficiency of chemical oxygen demand and ammonia nitrogen removal, and altered microbial activity and the composition of extracellular polymers in the biological wastewater treatment process.

Polymers

PTFE

The impact of polytetrafluoroethylene-nanoplastics (PTFE-NPs) on biological sewage disposal was delved, containing nitrogen remotion, microbiological activity and composition of extracellular polymer (EPS). The addition of PTFE-NPs reduced the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen (NH-N) by 3.43 % and 2.35 %, respectively. In comparison with no PTFE-NPs, the specific oxygen uptake rate (SOUR), specific ammonia oxidation rate (SAOR), specific nitrite oxidation rate (SNOR) and specific nitrate reduction rate (SNRR) decreased by 65.26 %, 65.24 %, 41.77 % and 54.56 %, respectively. The PTFE-NPs inhibited the activities of nitrobacteria and denitrobacteria. It was worth noting that, nitrite oxidized bacterium was more resistant to adverse environments than ammonia oxidizing bacterium. Compared with no PTFE-NPs, the reactive oxygen species (ROS) content and lactate dehydrogenase (LDH) grew by 130 % and 50 % under PTFE-NPs pressure. The appearance of PTFE-NPs affected the normal function of microorganisms by inducing endocellular oxidative stress and destroying the completeness of the cytomembrane. The protein (PN) and polysaccharide (PS) levels in loosely bound EPS (LB-EPS) and tightly bound EPS (TB -EPS) increased by 4.96, 0.70, 3.07 and 0.71 mg g VSS, under PTFE-NPs. Meanwhile, the PN/PS ratios of LB-EPS and TB -EPS increased from 6.18 and 6.41-11.04 and 9.29, respectively. The LB-EPS might provide sufficient binding sites for PTFE-NPs adsorption due to its loose and porous structure. The defense mechanism of bacteria against PTFE-NPs was mainly the PN in loosely bound EPS. Moreover, the functional groups referred to the complexation of EPS with PTFE-NPs were mainly related to N-H, CO, and C-N in proteins and O-H in polysaccharides.

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