Characteristics and nontargeted metabolomics analysis of anammox granular sludge under short-term exposure to polypropylene and polylactic acid microplastics

IF 4.1 2区 环境科学与生态学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Haijuan Qin, Yuliang Zhao, Yuhua Lyu, Shuaihao Liu, Song Yan, Lei Han
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Abstract

A significant quantity of microplastics (MPs) is concealed within biological sludge. Current research predominantly examines the effects of non-biodegradable MPs on traditional sludge. However, the influence of biodegradable MPs on the functional microbial activity of anaerobic ammonium oxidation granular sludge (AnGS) remains inadequately explored. This study specifically investigated the effects of non-biodegradable polypropylene (PP) MPs and biodegradable polylactic acid (PLA) MPs on AnGS under short-term stress. The study found that PP MPs inhibited nitrogen removal performance, reducing nitrogen removal efficiency by 1.14% (100 mesh) and 5.77% (1000 mesh) respectively, along with decreased hydrazine dehydrogenase (HDH) activity. Conversely, PLA promoted denitrification performance, increasing efficiency by 8.21% (100 mesh) and 6.54% (1000 mesh). In response to MPs-induced environmental stress, the secretion of extracellular polymeric substances (EPS) increased in all experimental groups. Additionally, non-targeted metabolomic analysis revealed a decrease in the abundance of KEGG pathways related to carbon and amino acid metabolism in the experimental groups, while the enrichment of terephthalate and benzamide in the PLA groups significantly impacted its process. These findings offered valuable insights into the impact of MPs on anaerobic ammonium oxidation (anammox) and could potentially enhance its application.

Abstract Image

短期暴露于聚丙烯和聚乳酸微塑料下的厌氧颗粒污泥的特征和非靶向代谢组学分析
生物污泥中隐藏着大量微塑料(MPs)。目前的研究主要是探讨不可生物降解的微塑料对传统污泥的影响。然而,可生物降解的 MPs 对厌氧氨氧化颗粒污泥(AnGS)功能微生物活性的影响仍未得到充分探讨。本研究专门探讨了不可生物降解的聚丙烯(PP)MPs 和可生物降解的聚乳酸(PLA)MPs 在短期压力下对 AnGS 的影响。研究发现,聚丙烯 MPs 会抑制脱氮性能,使脱氮效率分别降低 1.14%(100 目)和 5.77%(1000 目),同时降低肼脱氢酶(HDH)活性。相反,聚乳酸促进了脱氮性能,使脱氮效率分别提高了 8.21%(100 目)和 6.54%(1000 目)。为了应对 MPs 诱导的环境压力,所有实验组的细胞外聚合物物质(EPS)分泌量都有所增加。此外,非靶向代谢组学分析显示,实验组中与碳和氨基酸代谢相关的 KEGG 通路的丰度有所下降,而聚乳酸组中对苯二甲酸盐和苯甲酰胺的富集显著影响了其过程。这些发现为了解 MPs 对厌氧氨氧化(anammox)的影响提供了宝贵的见解,并有可能提高其应用。
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来源期刊
CiteScore
9.60
自引率
10.40%
发文量
107
审稿时长
21 days
期刊介绍: International Biodeterioration and Biodegradation publishes original research papers and reviews on the biological causes of deterioration or degradation.
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