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Deciphering the inhibition mechanisms of microplastics on the full-stage sludge anaerobic digestion via enrichment to anaerobic microbes and toxicity of released compounds

Journal of Hazardous Materials 2024 21 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 65 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Xiaowei Wu, Zixuan Zhang, Zixuan Zhang, Taishuo Zhang, Zixuan Zhang, Peng Liu, Peng Liu, Peng Liu, Xiaowei Wu, Peng Liu, Xiaowei Wu, Xiaowei Wu, Peng Liu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Taishuo Zhang, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Taishuo Zhang, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Zixuan Zhang, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Peng Liu, Peng Liu, Taishuo Zhang, Hong Qiang, Zixuan Zhang, Taishuo Zhang, Xiaowei Wu, Xiaowei Wu, Taishuo Zhang, Xiaowei Wu, Xiaowei Wu, Xiaowei Wu, Peng Liu, Peng Liu, Hong Qiang, Hanzhong Jia, Hanzhong Jia, Xiaowei Wu, Hanzhong Jia, Hanzhong Jia, Peng Liu, Peng Liu, Xiaowei Wu, Kai Li, Peng Liu, Zixuan Zhang, Hanzhong Jia, Xiaowei Wu, Peng Liu, Zixuan Zhang, Zixuan Zhang, Xiaowei Wu, Xiaowei Wu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Taishuo Zhang, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xiaowei Wu, Xiaowei Wu, Zixuan Zhang, Zixuan Zhang, Lingyan Zhu Lingyan Zhu Lingyan Zhu Lingyan Zhu Lingyan Zhu Lingyan Zhu Peng Liu, Hong Qiang, Hong Qiang, Hong Qiang, Hong Qiang, Lingyan Zhu Hong Qiang, Hong Qiang, Taishuo Zhang, Hanzhong Jia, Hong Qiang, Lingyan Zhu Lingyan Zhu Hanzhong Jia, Lingyan Zhu Hanzhong Jia, Lingyan Zhu Peng Liu, Xiaowei Wu, Peng Liu, Zixuan Zhang, Hong Qiang, Zixuan Zhang, Peng Liu, Lingyan Zhu Xiaowei Wu, Peng Liu, Taishuo Zhang, Taishuo Zhang, Hanzhong Jia, Hanzhong Jia, Taishuo Zhang, Lingyan Zhu Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Peng Liu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Peng Liu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu Hanzhong Jia, Lingyan Zhu Xiaowei Wu, Lingyan Zhu Lingyan Zhu Lingyan Zhu Hanzhong Jia, Hong Qiang, Taishuo Zhang, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu Lingyan Zhu Lingyan Zhu Lingyan Zhu Lingyan Zhu Hong Qiang, Lingyan Zhu Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Peng Liu, Peng Liu, Peng Liu, Hong Qiang, Hong Qiang, Xiaowei Wu, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu Hanzhong Jia, Hanzhong Jia, Lingyan Zhu

Summary

This study found that microplastics in sewage sludge significantly interfere with the waste treatment process by reducing the activity of key microorganisms needed to break down waste. More than half of the negative effect came from toxic chemicals released when microplastic particles rub against sludge, and the disrupted treatment also increased the risk of spreading antibiotic-resistant bacteria.

Study Type Environmental

Increasingly accumulated microplastics (MPs) in sludge could affect the sludge treatment process, while the contributions and mechanisms of MP particles and the released organic matters (MP-DOM) are not fully understood. To fill this gap, this study systematically investigates the effects and mechanisms of MPs on sludge anaerobic digestion. In the presence of MPs, the hydrolysis and acidogenesis of organic matters and methanogenesis all decreased due to the inhibition on the activity of anaerobic microorganisms and key enzymes. Mechanism analysis showed that MPs mainly acted as substrates to enrich anaerobic microorganisms and reduced the abundance and function of free microorganisms in sludge that metabolized organic matters. Moreover, a large amount of organic compounds including various plasticizers (dibutyl phthalate) and chain-scission products (benzoic acid) from physical abrasions of MPs with sludge particles, which made a 50.9-51.6 % contribution to the MP-inhibited sludge anaerobic digestion by the chemical toxicity and generated reactive oxygen species. Owing to the decreased digestion performance, the risk associated with ARGs and pathogenic bacteria increased distinctly. The findings highlight the concerns about MP-derived organic compounds compared to the substrate themselves and suggest the necessity for removing MPs in the sludge of wastewater treatment plants (WWTP).

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