摘要
针对重金属Cd^(2+)对新型后置反硝化脱氮除磷性能影响不明确的现状,本研究建立序批式反应器并探究了不同剂量的Cd^(2+)对后置反硝化生物脱氮除磷的影响。结果表明,低质量浓度Cd^(2+)(0.1和0.5mg/L)对生物脱氮除磷影响不明显,然而当Cd^(2+)的质量浓度为2 mg/L,生物脱氮除磷效率分别为78.6%和79.5%,显著低于空白组。机理研究表明高质量浓度Cd^(2+)对NH+4-N的氧化影响不明显,然而反硝化过程却受到严重的抑制作用。此外Cd^(2+)的存在对厌氧释磷和好氧吸磷均有不同程度的抑制,当Cd^(2+)的质量浓度为2 mg/L时,厌氧最大释磷量为47 mg/L,聚羟基烷酸酯(PHA)的最大合成量为4.35 mmol/g,显著低于空白组。PHA的厌氧合成受阻从而导致好氧分解产能低,好氧吸磷不充分。
In order to solve the problem that the effect of heavy metal Cd2+on the performance of biological nitrogen and phosphorus removal(BNPR)in novel post-denitrification system was not clear,in this study,sequencing batch reactors are set up and the effects of different dosages of Cd2+on the BNPR are studied.The results show that low mass concentration of Cd2+(0.1and0.5mg/L)has no obvious effect on BNPR,however,when the mass concentration of Cd2+is2mg/L,the efficiencies of BNPR are78.6%and79.5%respectively,significantly lower than those of blank group.The mechanism studies show that,the effect of high concentration of Cd2+on the oxidation of NH+4-N is not obvious,but the denitrification process is severely inhibited.In addition,the presence of Cd2+inhibites P anaerobic release and aerobic uptake and when the mass concentration of Cd2+is2mg/L,the maximum amount of P anaerobic release is47mg/L,and the maximum amount of Polyhydroxyalkanoate(PHA)is4.35mmol/g,significantly lower than those in blank.PHA anaerobic synthesis is blocked,resulting in low decomposition of aerobic capacity and the aerobic phosphorus is not sufficient.
作者
潘民强
王婧
PAN Minqiang;WANG Jing(Hebei Province Zhangjiakou Environmental Monitoring Center Zhangjiakou,Hebei 075000)
出处
《工业安全与环保》
2018年第3期95-98,103,共5页
Industrial Safety and Environmental Protection
关键词
重金属Cd2+
后置反硝化
脱氮除磷
聚羟基烷酸酯
heavy metal Cd 2+
post-denitrification
nitrogen and phosphorus removal
polyhydroxyalkanoate
