Cu^2＋、Zn^2＋对生物脱氮系统的影响  

Effects of Cu^(2+) and Zn^(2+) on the biological nitrogen removal system

作　　者：荣宏伟 王勤 张朝升 张可方 

机构地区：[1]厂州大学土木工程学院,广州510006

出　　处：《环境工程学报》2009年第4期617-620,共4页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50578044);广东省科技攻关引导项目(2004B33301006);广州市建设科技计划项目(200612);广州市教育局科技计划项目(62018);国家水体污染控制与治理科技重大专项项目(2008ZX07211-007)

摘　　要：Cu2+和Zn2+是污水处理工艺中经常遇到的金属离子。在驯化好的活性污泥系统中,研究了金属离子Cu2+和Zn2+在0~100 mg/L浓度下对活性污泥生物脱氮系统的影响。试验发现Cu2+>5 mg/L、Zn2+>30 mg/L时,对硝化过程具有明显的抑制作用,在同样浓度的试验条件下Cu2+对硝化过程的抑制作用比Zn2+大。Cu2+≤0.5 mg/L时对反硝化过程具有一定的促进作用,有助于提高TN的去除效果;Cu2+>0.5 mg/L时,对反硝化产生抑制作用,随着浓度的增加,TN去除率逐渐下降。Zn2+不影响反硝化过程,仅在大于30 mg/L时,对硝化过程产生抑制作用。重金属Cu2+对生物脱氮系统的影响明显强于Zn2+。Cu^2＋ and Zn^2＋ are the most common metal ions in wastewater treatment process. In this paper, the effects of Cu^2 ＋ and Zn^2＋ on the biological nitrogen removal system have been assessed for a range of metal ion concentration from 0 to 100 mg/L on the basis of good activated sludge system. When Cu^2＋ was more than 5 mg/L and Zn^2＋ was more than 30 mg/L, which was found to have inhibiting effect on biological nitrogen based on tests. Tests were performed on the same concentrations of ion, it was found that the inhibitory effect on nitrification of Cu^2 ＋ was stronger than Zn^2＋ Copper had some promoting effect on denitrification while Cu^2＋ was less than 0.5 mg/L and was helpful to improve the removal rate of TN. But when Cu^2＋ was more than 0.5 mg/L, the inhibitory effect on denitrification may be produced by copper. The removal rate of TN would gradually decrease with the increase of concentration of Cu^2＋. Zinc showed no inhibitory effect on denitrification, but inhibitory effect on nitrification at the concentrations of Zn^2＋ above 30 mg/L. The results revealed that the effect of Cu^2 ＋ on the biological nitrogen removal system was stronger than that of Zn^2＋ .

关 键 词：重金属 活性污泥 生物脱氮 促进 抑制 

分 类 号：X703[环境科学与工程—环境工程]