PDF(Pubmed)
Abstract：
UNASSIGNED: Microplastics (MPs), identified as emerging contaminants, have been detected across diverse environmental media. Their enduring presence and small size facilitate the adsorption of organic pollutants and heavy metals, leading to combined pollution effects. MPs also accumulate in the food chain thus pose risks to animals, plants, and human health, garnering significant scholarly attention in recent years. Aerobic granular sludge (AGS) technology emerges as an innovative approach to wastewater treatment. However, the impacts of MPs on the operational efficiency and microbial characteristics of AGS systems has been insufficiently explored.
UNASSIGNED: This study investigated the effects of varying concentration (10, 50, and 100 mg/L) of biodegradable MPs (Polylactic Acid, PLA) and non-biodegradable MPs (Polyethylene Terephthalate, PET) on the properties of AGS and explored the underlying mechanisms.
UNASSIGNED: It was discovered that low and medium concentration of MPs (10 and 50 mg/L) showed no significant effects on COD removal by AGS, but high concentration (100 mg/L) of MPs markedly diminished the ability to remove COD of AGS, by blocking most of the nutrient transport channels of AGS. However, both PLA and PE promoted the nitrogen and phosphorus removal ability of AGS, and significantly increased the removal efficiency of total inorganic nitrogen (TIN) and total phosphorus (TP) at stages II and III (P < 0.05). High concentration of MPs inhibited the growth of sludge. PET noticeably deteriorate the sedimentation performance of AGS, while 50 mg/L PLA proved to be beneficial to sludge sedimentation at stage II. The addition of MPs promoted the abundance of Candidatus_Competibacter and Acinetobacter in AGS, thereby promoting the phosphorus removal capacity of AGS. Both 50 mg/L PET and 100 mg/L PLA caused large amount of white Thiothrix filamentous bacteria forming on the surface of AGS, leading to deterioration of the sludge settling performance and affecting the normal operation of the reactor. Comparing with PET, AGS proved to be more resistant to PLA, so more attention should be paid to the effect of non-biodegradable MPs on AGS in the future.
UNASSIGNED: This study investigated the effects of varying concentration (10, 50, and 100 mg/L) of biodegradable MPs (Polylactic Acid, PLA) and non-biodegradable MPs (Polyethylene Terephthalate, PET) on the properties of AGS and explored the underlying mechanisms.
UNASSIGNED: It was discovered that low and medium concentration of MPs (10 and 50 mg/L) showed no significant effects on COD removal by AGS, but high concentration (100 mg/L) of MPs markedly diminished the ability to remove COD of AGS, by blocking most of the nutrient transport channels of AGS. However, both PLA and PE promoted the nitrogen and phosphorus removal ability of AGS, and significantly increased the removal efficiency of total inorganic nitrogen (TIN) and total phosphorus (TP) at stages II and III (P < 0.05). High concentration of MPs inhibited the growth of sludge. PET noticeably deteriorate the sedimentation performance of AGS, while 50 mg/L PLA proved to be beneficial to sludge sedimentation at stage II. The addition of MPs promoted the abundance of Candidatus_Competibacter and Acinetobacter in AGS, thereby promoting the phosphorus removal capacity of AGS. Both 50 mg/L PET and 100 mg/L PLA caused large amount of white Thiothrix filamentous bacteria forming on the surface of AGS, leading to deterioration of the sludge settling performance and affecting the normal operation of the reactor. Comparing with PET, AGS proved to be more resistant to PLA, so more attention should be paid to the effect of non-biodegradable MPs on AGS in the future.
摘要：
■微塑料（MPs），被确定为新兴污染物，已经在各种环境媒体上被发现。它们的持久存在和小尺寸有利于有机污染物和重金属的吸附，导致综合污染效应。国会议员还在食物链中积累，从而对动物构成风险，植物,和人类健康，近年来引起了学术界的广泛关注。好氧颗粒污泥（AGS）技术作为一种创新的废水处理方法出现。然而,MP对AGS系统运行效率和微生物特性的影响尚未得到充分探索。
■这项研究调查了不同浓度（10、50和100mg/L）的生物可降解MPs（聚乳酸，PLA)和不可生物降解的MPs(聚对苯二甲酸乙二醇酯，PET）对AGS的性质进行了研究，并探讨了潜在的机理。
■发现低浓度和中等浓度的MPs（10和50mg/L）对AGS去除COD没有显着影响，但是高浓度（100mg/L）的MPs显著降低了AGS去除COD的能力，通过阻断AGS的大部分养分运输通道。然而,PLA和PE都促进了AGS的脱氮除磷能力，显著提高了Ⅱ、Ⅲ期总无机氮(TIN)和总磷(TP)的去除效率(P<0.05)。高浓度的MPs抑制了污泥的生长。PET会显著降低AGS的沉降性能，在第二阶段，50mg/L的PLA被证明对污泥沉降有益。MP的添加促进了AGS中念珠菌_竞争性杆菌和不动杆菌的丰度，从而促进AGS的除磷能力。50mg/LPET和100mg/LPLA均可在AGS表面形成大量白色丝状细菌，导致污泥沉降性能恶化,影响反应器的正常运行。与PET相比,AGS被证明对PLA更具抗性，因此，未来应更加关注不可生物降解的MPs对AGS的影响。
■这项研究调查了不同浓度（10、50和100mg/L）的生物可降解MPs（聚乳酸，PLA)和不可生物降解的MPs(聚对苯二甲酸乙二醇酯，PET）对AGS的性质进行了研究，并探讨了潜在的机理。
■发现低浓度和中等浓度的MPs（10和50mg/L）对AGS去除COD没有显着影响，但是高浓度（100mg/L）的MPs显著降低了AGS去除COD的能力，通过阻断AGS的大部分养分运输通道。然而,PLA和PE都促进了AGS的脱氮除磷能力，显著提高了Ⅱ、Ⅲ期总无机氮(TIN)和总磷(TP)的去除效率(P<0.05)。高浓度的MPs抑制了污泥的生长。PET会显著降低AGS的沉降性能，在第二阶段，50mg/L的PLA被证明对污泥沉降有益。MP的添加促进了AGS中念珠菌_竞争性杆菌和不动杆菌的丰度，从而促进AGS的除磷能力。50mg/LPET和100mg/LPLA均可在AGS表面形成大量白色丝状细菌，导致污泥沉降性能恶化,影响反应器的正常运行。与PET相比,AGS被证明对PLA更具抗性，因此，未来应更加关注不可生物降解的MPs对AGS的影响。
