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Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-01-19 , DOI: 10.1021/acs.est.3c09280 Yanying He 1 , Yingrui Liu 1 , Xuecheng Li 1 , Haixiao Guo 1 , Tingting Zhu 1 , Yiwen Liu 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-01-19 , DOI: 10.1021/acs.est.3c09280 Yanying He 1 , Yingrui Liu 1 , Xuecheng Li 1 , Haixiao Guo 1 , Tingting Zhu 1 , Yiwen Liu 1
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Partial nitritation (PN) is an important partner with anammox in the sidestream line treating high-strength wastewater and primarily contributes to nitrous oxide (N2O) emissions in such a hybrid system, which also suffers from ubiquitous microplastics because of the growing usage and disposal levels of plastics. In this study, the influences of polyvinyl chloride microplastics (PVC-MPs) on N2O-contributing pathways were experimentally revealed to fill the knowledge gap on N2O emission from the PN system under microplastics stress. The long-term results showed that the overall PN performance was hardly affected by the low-dose PVC-MPs (0.5 mg/L) while obviously deteriorated by the high dose (5 mg/L). According to the batch tests, PVC-MPs reduced biomass-specific ammonia oxidation rates (AORs) by 5.78–21.94% and stimulated aerobic N2O production by 9.22–88.36%. Further, upon increasing dissolved oxygen concentrations from 0.3 to 0.9 mg O2/L, the degree of AOR inhibition increased but that of N2O stimulation was lightened. Site preference analysis in combination with metabolic inhibitors demonstrated that the contributions of hydroxylamine oxidation and heterotrophic denitrification to N2O production at 0.3 mg O2/L were enhanced by 18.84 and 10.34%, respectively, accompanied by a corresponding decreased contribution of nitrifier denitrification. Finally, the underlying mechanisms proposed for negative influences of PVC-MPs were bisphenol A leaching and reactive oxygen species production, which led to more cell death, altered sludge properties, and reshaped microbial communities, further resulting in enhanced N2O emission. Overall, this work implied that the ubiquitous microplastics are a hidden danger that cannot be ignored in the PN system.
中文翻译：
聚氯乙烯微塑料促进部分亚硝化系统中一氧化二氮的生产
部分亚硝化 (PN) 是处理高浓度废水的侧流管线中厌氧氨氧化的重要合作伙伴，主要导致此类混合系统中一氧化二氮 (N 2 O) 的排放，由于使用量的不断增加，该系统也受到无处不在的微塑料的影响。塑料的处置水平。本研究通过实验揭示了聚氯乙烯微塑料（PVC-MPs）对N 2 O贡献途径的影响，以填补微塑料胁迫下PN系统N 2 O排放的知识空白。长期结果表明，低剂量 PVC-MP（0.5 mg/L）对整体 PN 性能几乎没有影响，而高剂量（5 mg/L）则明显恶化。根据批量测试，PVC-MP 使生物质特定氨氧化率 (AOR) 降低了 5.78-21.94%，并刺激好氧 N 2 O 产生 9.22-88.36%。此外，当溶解氧浓度从0.3 mg O 2 /L增加到0.9 mg O 2 /L时，AOR抑制程度增加，但N 2 O刺激程度减轻。结合代谢抑制剂的位点偏好分析表明，在0.3 mg O 2 /L条件下，羟胺氧化和异养反硝化对N 2 O产生的贡献分别增强了18.84和10.34%，同时硝化菌反硝化的贡献相应下降。最后，提出 PVC-MP 负面影响的潜在机制是双酚 A 浸出和活性氧的产生，这导致更多的细胞死亡、改变污泥特性并重塑微生物群落，进一步导致 N 2 O 排放增加。 总的来说，这项工作意味着无处不在的微塑料是PN系统中不可忽视的隐患。
更新日期：2024-01-19
中文翻译：
聚氯乙烯微塑料促进部分亚硝化系统中一氧化二氮的生产
部分亚硝化 (PN) 是处理高浓度废水的侧流管线中厌氧氨氧化的重要合作伙伴，主要导致此类混合系统中一氧化二氮 (N 2 O) 的排放，由于使用量的不断增加，该系统也受到无处不在的微塑料的影响。塑料的处置水平。本研究通过实验揭示了聚氯乙烯微塑料（PVC-MPs）对N 2 O贡献途径的影响，以填补微塑料胁迫下PN系统N 2 O排放的知识空白。长期结果表明，低剂量 PVC-MP（0.5 mg/L）对整体 PN 性能几乎没有影响，而高剂量（5 mg/L）则明显恶化。根据批量测试，PVC-MP 使生物质特定氨氧化率 (AOR) 降低了 5.78-21.94%，并刺激好氧 N 2 O 产生 9.22-88.36%。此外，当溶解氧浓度从0.3 mg O 2 /L增加到0.9 mg O 2 /L时，AOR抑制程度增加，但N 2 O刺激程度减轻。结合代谢抑制剂的位点偏好分析表明，在0.3 mg O 2 /L条件下，羟胺氧化和异养反硝化对N 2 O产生的贡献分别增强了18.84和10.34%，同时硝化菌反硝化的贡献相应下降。最后，提出 PVC-MP 负面影响的潜在机制是双酚 A 浸出和活性氧的产生，这导致更多的细胞死亡、改变污泥特性并重塑微生物群落，进一步导致 N 2 O 排放增加。 总的来说，这项工作意味着无处不在的微塑料是PN系统中不可忽视的隐患。
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