摘要
在C/N=20最优碳氮比条件下,批式实验考查了Ni(II),Cu(II),Zn(II)及Cd(II)四种常见重金属离子对具有好氧反硝化功能的Paracoccus versutus LYM的好氧生长、培养基pH变化、NO2--N积累、NO_3~--N降解及气态反硝化产物的影响。结果显示,在好氧开放体系中,四种金属离子对好氧反硝化过程的抑制顺序为Cd(II)>Cu(II)>Ni(II)>Zn(II)。Cu(II)严重抑制亚硝酸盐还原酶活性。对密闭体系中气态反硝化产物考查结果发现,去除的NO_3~--N主要转化为N_2,且整个反硝化过程没有检测出N_2O。
In order to obtain more information about inhibitory effects of heavy metals on aerobic denitrification process,the effects of four common heavy metals,namely Ni(II),Cu(II),Zn(II) and Cd(II),on Paracoccus versutus LYM aerobic growth,culture media pH,NO2--N accumulation,NO3--N degradation and gaseous denitrification products were investigated by batch assays at the optimal C/N ratio of 20.The results showed the inhibitory order on aerobic denitrification process was Cd(II) > Cu(II) > Ni(II) > Zn(II) in the open system.Cu(II) inhibited the activity of nitrite reductase seriously.The major fate of removed NO3--N was N2,which was the predominant gaseous denitrification products,without N2 O detected in the closed system.
引文
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