ZHANGXiang-lin,WANGYan-ping.Effect and Mechanism of Perfluorooctanoic Acid on Aerobic Granular Sludge Reactor[J].China Water & Wastewater,2024,40(19):87-93.
全氟辛酸对好氧颗粒污泥反应器的影响及作用机制
- Title:
- Effect and Mechanism of Perfluorooctanoic Acid on Aerobic Granular Sludge Reactor
- 摘要:
- 为探究新污染物全氟辛酸（PF）对好氧颗粒污泥（AGS）运行效能的影响，构建了实验室规模的AGS系统，通过控制进水PF浓度，在中温（35 ℃）条件下考察了PF对AGS运行效能及微生物群落特征的影响。结果表明，低浓度PF（低于0.5 mg/L）对AGS的运行效能及微生物群落影响不明显，而当PF浓度超过0.5 mg/L时，降低了AGS对污染物及营养盐的去除效果，尤其当PF浓度为4.0 mg/L时，出水COD浓度高达36.5~38.2 mg/L，相应去除率下降至74.9%~76.2%。PF降低了污泥浓度及有机质占比，但提高了颗粒污泥沉降性并刺激了胞外聚合物（EPS）的分泌，尤其是蛋白质的分泌，提高了蛋白质/多糖（PN/PS）值。微生物学分析表明，PF降低了变形菌门、绿弯菌门等门级别微生物以及可塑菌属、索氏菌属及动胶菌属等属级别微生物的相对丰度。
- Abstract:
- This paper established a laboratory?scale aerobic granular sludge (AGS) system to investigate the influence of an emerging contaminant, perfluorooctanoic acid (PF), on the operational efficiency of AGS, and explored the impacts of PF on the operational efficiency and microbial community characteristics of AGS at a medium temperature (35 ℃) through controlling the concentration of PF in the influent. Low concentrations of PF (less than 0.5 mg/L) had no significant influence on the operating efficiency of AGS and the microbial community. However, when the PF concentration exceeded 0.5 mg/L, the performances of AGS for removing pollutants and nutrients were weakened, particularly when the PF concentration was 4.0 mg/L. The effluent COD was as high as 36.5-38.2 mg/L, and the corresponding removal efficiency dropped to 74.9%-76.2%. PF reduced the sludge concentration and the proportion of organic matter, yet enhanced the sedimentation of granular sludge and stimulated the secretion of extracellular polymeric substance (EPS), particularly the secretion of protein, and augmented the protein/polysaccharide (PN/PS) ratio. Microbiological analysis revealed that PF reduced the relative abundance of phyla such as Proteobacteria and Chloroflexi, and the relative abundance of genera such as Plasticicumulans, Thauera and Zoogloea.
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