HANZong-shuo,ZHENGXiao-ying,XUZhi,et al.Effects of Perfluorooctanoic Acid on Characteristics of Aerobic Granular Sludge[J].China Water & Wastewater,2023,39(13):109-116.
全氟辛酸对好氧颗粒污泥性能的影响
- Title:
- Effects of Perfluorooctanoic Acid on Characteristics of Aerobic Granular Sludge
- Keywords:
- aerobic granular sludge; perfluorooctanoic acid; nitrogen and phosphorus removal; extracellular polymer substances; microbial community
- 摘要:
- 研究了序批式反应器（SBR）中，不同浓度全氟辛酸（PFOA）对好氧颗粒污泥（AGS）系统的影响机制。结果表明，随着PFOA浓度的增加（0、0.05、0.5和2.0 mg/L），系统中的污泥浓度和生物量明显减少，并伴有颗粒增大和沉降性能下降的现象。当PFOA≥0.5 mg/L时，AGS对TP、TN的去除受到明显抑制，去除率较空白组分别降低了11.01%、9.81% （PFOA=0.5 mg/L）和18.57%、14.96% （PFOA=2.0 mg/L）。水中PFOA主要通过污泥吸附作用去除，而受生物降解影响甚微。污泥通过增加胞外聚合物（EPS）的分泌以抵御毒性，三维荧光光谱显示EPS中代表色氨酸和酪氨酸类物质的峰荧光强度增加，而芳香蛋白色氨酸类物质可能与PFOA发生反应。高通量测序结果表明，在PFOA≥0.5 mg/L的胁迫下，除磷菌Pseudomonas和Acinetobacter的相对丰度分别从空白组的5.92%、10.69%降至3.86%、6.56% （PFOA=0.5 mg/L）和3.49%、3.49% （PFOA=2.0 mg/L），反硝化功能菌Thermomonas、Flavobacterium和Gemmatimonass丰度亦显著下降，颗粒污泥的好氧吸磷、硝化和反硝化过程受到明显抑制。综合分析暴露于PFOA环境中AGS各项性能和微生物群落的响应变化，提出了PFOA对AGS系统的抑制浓度为0.5 mg/L。
- Abstract:
- The effect of different concentrations of perfluorooctanoic acid (PFOA) on aerobic granular sludge (AGS) in a sequencing batch reactor (SBR) was investigated. With the increase of PFOA concentration (0 mg/L, 0.05 mg/L, 0.5 mg/L and 2.0 mg/L), the sludge concentration and biomass in the system decreased significantly, the particle size increased, and the settling performance decreased. When the concentration of PFOA was greater than or equal to 0.5 mg/L, it had obvious inhibitions on the removal of TP and TN. Compared with the blank group, the removal rates of TP and TN were decreased by 11.01% and 9.81% respectively when the concentration of PFOA was 0.5 mg/L, and 18.57% and 14.96% respectively when the concentration of PFOA was 2.0 mg/L. PFOA was mainly removed from water by sludge adsorption, while biodegradation had little effect on it. The sludge resisted the toxicity by secreting more extracellular polymer substances (EPS). Three-dimensional fluorescence spectra showed that the peak fluorescence intensity which represented tryptophan-like and tyrosine?like substances in EPS increased, and aromatic protein tryptophan substances in EPS might react with PFOA. High-throughput sequencing results showed that the relative abundance of Pseudomonas and Acinetobacter in the blank group decreased from 5.92% and 10.69% to 3.86% and 6.56% respectively when the concentration of PFOA was 0.5 mg/L, and 3.49% and 3.49% respectively when the concentration of PFOA was 2.0 mg/L. The abundance of Thermomonas, Flavobacterium and Gemmatimonass also decreased significantly, and the aerobic phosphorus absorption, nitrification and denitrification processes of granular sludge were significantly inhibited. After a comprehensive analysis of the changes in the properties of aerobic granular sludge and the response of the microbial community under PFOA exposure, the inhibitory concentration of PFOA on aerobic granular sludge system was proposed to be 0.5 mg/L.
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