Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna 45G, 10-709 Olsztyn, Poland.
Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna 45G, 10-709 Olsztyn, Poland.
J Hazard Mater. 2024 Sep 5;476:135061. doi: 10.1016/j.jhazmat.2024.135061. Epub 2024 Jul 5.
This study investigated the relationship between microplastic (MP) presence and pollutant removal in granular sludge sequencing batch reactors (GSBRs). Two types of MPs, polyethylene (PE) and polyethylene terephthalate (PET), were introduced in varying concentrations to assess their effects on microbial community dynamics and rates of nitrogen, phosphorus, and organic compound removal. The study revealed type-dependent variations in the deposition of MPs within the biomass, with PET-MPs exhibiting a stronger affinity for accumulation in biomass. A 50 mg/L dose of PET-MP decreased COD removal efficiency by approximately 4 % while increasing P-PO removal efficiency by around 7 % compared to the control reactor. The rate of nitrogen compounds removal decreased with higher PET-MP dosages but increased with higher PE-MP dosages. An analysis of microbial activity and gene abundance highlighted the influence of MPs on the expression of the nosZ and ppk1 genes, which code enzymes responsible for nitrogen and phosphorus transformations. The study also explored shifts in microbial community structure, revealing alterations with changes in MP dose and type. This research contributes valuable insights into the complex interactions between MP, microbial communities, and pollutant removal processes in GSBR systems, with implications for the sustainable management of wastewater treatment in the presence of MP.
本研究考察了颗粒污泥序批式反应器（GSBR）中微塑料（MP）存在与污染物去除之间的关系。引入了两种类型的 MPs，即聚乙烯（PE）和聚对苯二甲酸乙二醇酯（PET），并以不同浓度进行了测试，以评估它们对微生物群落动态和氮、磷和有机化合物去除率的影响。研究揭示了 MPs 在生物量内沉积的类型依赖性变化，其中 PET-MP 表现出更强的在生物量中积累的亲和力。与对照反应器相比，50mg/L 的 PET-MP 剂量使 COD 去除效率降低了约 4%，而使 P-PO 去除效率提高了约 7%。随着 PET-MP 剂量的增加，氮化合物的去除率降低，但随着 PE-MP 剂量的增加而增加。对微生物活性和基因丰度的分析强调了 MPs 对编码负责氮和磷转化的酶的 nosZ 和 ppk1 基因表达的影响。该研究还探讨了微生物群落结构的变化，揭示了 MP 剂量和类型变化引起的变化。这项研究为 GSBR 系统中 MP、微生物群落和污染物去除过程之间的复杂相互作用提供了有价值的见解，对存在 MP 的废水处理的可持续管理具有重要意义。
