PFOA与PFOS对厌氧氨氧化污泥特性和微生物群落的影响

通过序批实验研究了不同浓度(0.5,1mg/L)与不同类型的全氟化合物(PFCs)对厌氧氨氧化(anammox)污泥脱氮性能及微生物群落的影响.结果表明,0.5与1mg/L全氟辛酸(PFOA)和全氟辛烷磺酸盐(PFOS)对anammox污泥的脱氮性能无明显抑制作用;1mg/L PFOA(OA1)与PFOS(OS1)添加...

Evaluation of sludge characteristics and microbial community of anammox sludge during exposure to perfluorooctane acid and perfluorooctane sulfonate

The sequential batch experiments explored the influence mechanism under different concentrations (0.5mg/L and 1mg/L) and types of perfluorinated compounds (PFCs) on the denitrification performance and microbial community of anaerobic ammonia oxidation (anammox) sludge. Results indicated that perfluorooctanoic acid (PFOA) (at 0.5mg/L, 1mg/L) and perfluorooctane sulfonate (PFOS) had no obvious inhibitory effect on the denitrification performance of the anammox sludge. The addition of 1mg/L PFOA (OA1) and PFOS (OS1) to the anammox sludge for one day resulted in removal rates of respectively 47.68% and 92.7%. X-ray photoelectron spectroscopy (XPS) analysis of the sludge showed the presence of C-F, MgF₂, CaF₂ functional groups in the OA1 and OS1 groups. The addition of PFOA and PFOS reduced the concentration of heme c in the anammox sludge by respectively 21.05% and 7.5%. The high-throughput sequencing analysis of the anammox sludge in different experimental groups showed that the addition of 1mg/L PFOA and PFOS could reduce the relative abundance of anammox bacteria and promote the relative abundance of denitrifying bacteria. The relative abundance of Candidatus Brocadia in the OA1 and OS1 groups decreased by respectively 1.08% and 0.28%, while the relative abundance of Acinetobacter increased by 1.73% and 0.06%. In general, the negative effects of PFOA on the anammox sludge were more significant than PFOS.