Effect of long-term exposure to non-biodegradable and biodegradable microplastics in continuous anoxic/aerobic bioreactors: Nitrogen removal performance, microbial communities and functional gene responses.

IF 8 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Management Pub Date : 2024-12-14 DOI:10.1016/j.jenvman.2024.123712
Bing Yao, Min Liu, Jin Zhang, Xuan Hu, Bin Wang, Ren-Jun Liang, Ying Chen
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Abstract

The environmental hazards caused by microplastics (MPs) have received widespread attention, but the effects of non-biodegradable and biodegradable MPs of long-term presence on continuously operating sewage treatment bioreactors are not well known. In this study, we investigated the effect of a representative non-biodegradable MP, polyethylene terephthalate (PET), and a biodegradable MP, polylactic acid (PLA), on the nitrogen removal performance of conventional anoxic/aerobic (A/O) process. The NH4+-N removal efficiencies were suppressed to 91.7 ± 5.5% and 80.8 ± 4.1% at concentrations of 10 and 100 mg/L PLA, significantly (p < 0.05) lower than 96.3 ± 1.0% and 95.0 ± 1.5% with the presence of PET. PLA resulted in a significant (p < 0.05) decrease in adenosine triphosphate of living cells (cATP) and dehydrogenase activities. PLA enhanced redox stress and induced a series of oxidative stress reactions that were detrimental to the normal growth and metabolism of microorganisms. The relative abundance of several functional microorganisms (Nitrosomonas,Nitrospira and Ellin6067) and genes (amoA, amoB and amoC) associated with NH4+-N conversion were reduced. The potential risk of biodegradable MPs to the long-term wastewater treatment process cannot be ignored and needs to be emphasized.

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连续缺氧/好氧生物反应器中长期暴露于不可降解和可生物降解微塑料的影响:脱氮性能、微生物群落和功能基因反应。
微塑料(MPs)对环境造成的危害已受到广泛关注,但长期存在的不可降解和可生物降解的微塑料对连续运行的污水处理生物反应器的影响却鲜为人知。在这项研究中,我们考察了具有代表性的不可生物降解 MP 聚对苯二甲酸乙二醇酯(PET)和可生物降解 MP 聚乳酸(PLA)对传统缺氧/好氧(A/O)工艺脱氮性能的影响。当聚乳酸的浓度为 10 和 100 mg/L 时,NH4+-N 的去除率分别为 91.7 ± 5.5% 和 80.8 ± 4.1%,显著降低(p 4+-N 转化率降低)。可生物降解的 MPs 对长期污水处理过程的潜在风险不容忽视,需要引起重视。
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来源期刊
Journal of Environmental Management
Journal of Environmental Management 环境科学-环境科学
CiteScore
13.70
自引率
5.70%
发文量
2477
审稿时长
84 days
期刊介绍: The Journal of Environmental Management is a journal for the publication of peer reviewed, original research for all aspects of management and the managed use of the environment, both natural and man-made.Critical review articles are also welcome; submission of these is strongly encouraged.
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