【摘要】 为了研究和比较重金属对双污泥系统的影响,在双污泥系统稳定运行的基础上,通过调节进水重金属(Cd²⁺、Cu²⁺、Zn²⁺)含量,分别考察了3种重金属短期冲击和长期冲击对双污泥系统碳、氮、磷去除效果的影响。结果显示,Cd²⁺、Cu²⁺、Zn²⁺对硝化菌的短期急毒性和抑制作用关系为Cd²⁺>Zn²⁺>Cu²⁺,对硝化菌的累积毒性和抑制作用关系为Cu²⁺>Cd²⁺>Zn²⁺。对反硝化聚磷菌的抑制作用关系为Cu²⁺>Cd²⁺>Zn²⁺,但Cu²⁺的抑制作用以长期累积毒性为主,Cd²⁺则以短期急毒性为主。COD_Cr去除率受3种重金属的影响比较小,其抑制作用关系为Cu²⁺>Cd²⁺>Zn²⁺。更多还原

【Abstract】 In order to study and compare the effects of heavy metals on dual-sludge system, the effects of short-term and long-term impacts of three heavy metals on removal efficiency of carbon, nitrogen and phosphorus in dual-sludge system were investigated respectively by adjusting the content of heavy metals(Cd²⁺, Cu²⁺, Zn²⁺) in influent, based on the stable operation of dual-sludge system. Results showed that the short-term acute toxicity and inhibitory effects of Cd²⁺, Cu²⁺ and Zn²⁺ on nitrifying bacteria was Cd²⁺>Zn²⁺>Cu²⁺, and cumulative toxicity and inhibitory effects on nitrifying bacteria was Cu²⁺>Cd²⁺>Zn²⁺. Relationship of inhibitory effect on denitrifying phosphorus accumulating bacteria was Cu²⁺>Cd²⁺>Zn²⁺, but the inhibitory effect of Cu²⁺ was mainly long-term cumulative toxicity, while Cd²⁺ was mainly short-term acute toxicity. COD_Cr removal rate was less affected by three heavy metals, and inhibitory relationship was Cu²⁺>Cd²⁺>Zn²⁺.更多还原