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Multiple microplastics induced stress on anaerobic granular sludge and an effectively overcoming strategy using hydrochar

Water Research 2022 43 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.

Zhijie Chen, Wei Wei, Zhijie Chen, Wei Wei, Wei Wei, Wei Wei, Wei Wei, Bing‐Jie Ni Wei Wei, Wei Wei, Wei Wei, Wei Wei, Wei Wei, Xingdong Shi, Xingdong Shi, Wei Wei, Xingdong Shi, Xingdong Shi, Xingdong Shi, Yuting Zhang, Yuting Zhang, Zhijie Chen, Wei Wei, Zhijie Chen, Yuting Zhang, Yuting Zhang, Bing‐Jie Ni Zhijie Chen, Zhijie Chen, Zhijie Chen, Lan Wu, Yuting Zhang, Wei Wei, Zhijie Chen, Wei Wei, Zhijie Chen, Zhijie Chen, Wei Wei, Zhijie Chen, Bing‐Jie Ni Wei Wei, Wei Wei, Wei Wei, Yuting Zhang, Wei Wei, Chen Wang, Wei Wei, Wei Wei, Wei Wei, Xingdong Shi, Wei Wei, Wei Wei, Bing‐Jie Ni Xingdong Shi, Xingdong Shi, Bing‐Jie Ni Wei Wei, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Wei Wei, Chen Wang, Chen Wang, Wei Wei, Yuting Zhang, Yuting Zhang, Lan Wu, Zhijie Chen, Zhijie Chen, Wei Wei, Zhijie Chen, Zhijie Chen, Zhijie Chen, Zhijie Chen, Wei Wei, Wei Wei, Wei Wei, Bing‐Jie Ni Lan Wu, Yuting Zhang, Wei Wei, Yuting Zhang, Wei Wei, Yuting Zhang, Chen Wang, Bing‐Jie Ni Bing‐Jie Ni Wei Wei, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Wei Wei, Wei Wei, Wei Wei, Wei Wei, Wei Wei, Bing‐Jie Ni Wei Wei, Bing‐Jie Ni Lan Wu, Lan Wu, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Zhijie Chen, Wei Wei, Wei Wei, Wei Wei, Wei Wei, Wei Wei, Wei Wei, Bing‐Jie Ni Bing‐Jie Ni Zhijie Chen, Bing‐Jie Ni Bing‐Jie Ni Chen Wang, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Lan Wu, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Wei Wei, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Wei Wei, Chen Wang, Bing‐Jie Ni Zhijie Chen, Bing‐Jie Ni Bing‐Jie Ni Bing‐Jie Ni Yuting Zhang, Bing‐Jie Ni Zhijie Chen, Wei Wei, Bing‐Jie Ni

Summary

Researchers investigated the effects of multiple types of microplastics simultaneously on anaerobic granular sludge used in wastewater treatment. The study found that combined microplastics caused significant stress on the sludge, reducing treatment efficiency, but that adding hydrochar effectively mitigated these negative effects and restored system performance.

Polymers

PE PET PP PS

Study Type Environmental

Previous studies mostly focused on the responses of anaerobic granular sludge (AGS) to one kind of microplastics during wastewater treatment. However, a wide variety of microplastics has been detected in wastewater. The multiple microplastics induced stress on AGS and the effectively mitigating strategy still remain unavailable. Herein, this work comprehensively excavated the influences of multiple microplastics (i.e., polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE) and polypropylene (PP)) coexisting in the wastewater on AGS system from macroscopic to microcosmic aspects. Experimental results illustrated that microplastics decreased AGS granule size, increased cell inactivation and caused deteriorative methane recovery from wastewater. As such, this study then put great emphasis on proposing a mitigating strategy using hydrochar and disclosing the role of hydrochar in overcoming the stress induced by coexisting microplastics to AGS system. Physiological characterization and microbial community analysis demonstrated that hydrochar effectively mitigated the reductions in methane production by 50.6% and cell viability by 68.8% of microplastics-bearing AGS and reduced the toxicity of microplastics to microbial community in the AGS. Mechanisms investigation by fluorescence tagging and excitation emission matrix fluorescence spectroscopy with fluorescence regional integration (EEM-FRI) analysis revealed that hydrochar adsorbed/accumulated microplastics and enhanced microplastics-bearing AGS to secrete extracellular polymeric substance (EPS) with more humic acid generation, thus reducing the direct contact between microplastics and AGS. In addition, hydrochar weakened the AGS intracellular oxidative stress induced by microplastics, thereby completely eliminating the inhibition of microplastics on acidification efficiency of AGS, and partially mitigating the suppression on methanation.

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