溴代阻燃剂对生物脱氮除磷的影响

EFFECT OF BROMINATED FLAME RETARDANT ON BIOLOGICAL NITROGEN AND PHOSPHORUS REMOVAL

为探究新兴污染物溴代阻燃剂(BFR)对生物脱氮除磷(BNPR)的影响,以实际废水为探究对象,建立厌氧/好氧/缺氧序批式反应器,中温环境下研究了不同浓度多溴联苯醚(PBDEs)对BNPR的影响。结果表明:PBDEs对BNPR的影响具有浓度依赖性,低浓度PBDEs对BNPR及污泥特征影响不明显,而ρ(PBDEs)>0.1 mg/L时可显著抑制BNPR。当PBDEs浓度为2.0 mg/L时,活性污泥系统稳定运行时化学需氧量(COD)、氨氮及正磷酸盐(OP)的去除率分别为73.2%~75.6%、85.2%和72.1%~73.6%,显著低于空白组。此外,PBDEs的存在可降低污泥内总悬浮固体和挥发性悬浮固体,提高污泥体积指数及胞外聚合物含量。典型周期研究发现PBDEs可抑制硝化、反硝化、厌氧释磷及好氧吸磷过程。

In order to explore the effect of the emerging pollutants brominated flame retardant(BFR)on the biological nitrogen and phosphorus removal(BNPR),an anaerobic/aerobic/anoxic sequencing batch reactor was established to study the effect of different concentrations of polybrominated diphenyl ether(PBDEs)on the BNPR.The results showed that the effect of PBDEs on BNPR was concentration dependent.Low concentration PBDEs had no significant effect on BNPR and sludge characteristics,but more than 0.1 mg/L PBDEs inhibited BNPR significantly.When the concentration of PBDEs was 2.0 mg/L,the removal efficiency of chemical oxygen demand(COD),ammonia nitrogen and ortho-phosphate(OP)were 73.2%~75.6%,85.2%and 72.1%~73.6%,respectively,which were significantly lower than those of the blank group.In addition,PBDEs reduced the total suspended solids(TSS)and volatile suspended solids(VSS)in the sludge,and increased the sludge volume index(SVI)and extracellular polymer content.PBDEs inhibited nitrification,denitrification,anaerobic phosphorus release and aerobic phosphorus uptake.