重金属对2-氯酚厌氧降解的抑制动力学研究  

Inhibition dynamics of heavey metals on the anaerobic degradation of 2-chlorophenol

作　　者：陈皓[1] 陈玲[1] 黄爱群[1] 王虹[1] 

机构地区：[1]同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室,上海200092

出　　处：《中国环境科学》2010年第3期328-332,共5页China Environmental Science

基　　金：国家"863"项目(20025AA601270)

摘　　要：考察了Cu2+、Cd2+、Ni2+、Fe2+4种重金属离子对2-氯酚(2-CP)厌氧降解速率的影响,并通过描述金属离子抑制作用的修正方程对实验进行拟合,研究了其动力学特征.结果表明,在0～500mg/L投加浓度范围内,Fe2+对2-CP的厌氧降解过程基本不抑制,Ni2+、Cu2+、Cd2+则存在明显抑制,抑制程度Cu2+﹥Ni2+﹥Cd2+.相同的抑制强度下,抑制浓度CIP-Cu﹤CIP-Ni﹤CIP-Cd.修正方程能较好地表征金属离子的抑制作用与该离子对降解速率的最大抑制浓度(I*)以及投加浓度之间的定量关系.由该方程拟合结果可得到Cu2+、Cd2+、Ni2+对25mg/L2-CP降解的I*值分别为458.7,1693.5,1528.5mg/L,I*及指数m值的大小表明金属离子对2-CP厌氧降解的抑制Cu2+﹥Ni2+﹥Cd2+.The effects of Cu^2＋, Cd^2＋, Ni^2＋, Fe^2＋ on 2-chlorophenol（2-CP） anaerobic degradation velocity and their inhibitive dynamics were studied.Fe2＋ had almost no inhibition on 2-CP degradation process with the injection concentration between 0 and 500mg/l, while Cu^2＋, Cd^2＋, Ni^2＋ presented obviously negative function and the relative toxicity was Cu^2＋Ni^2＋Cd^2＋.CIP could be used to evaluate the relationship between metal concentration and inhibitive strength.Furthermore, inhibition kinetic equation could be applied to depict the characteristic of metal ion inhibition and quantity relationship between the maximum inhibiting concentration of metal ions and their dosage and was also able to evaluate the inhibition level of heavy metal ions.According to the equation fitting results the strongest inhitory concentrions（I） of 25mg/L Cu2＋, Ni^2＋, Cd^2＋ were 458.7, 1693.5, 1528.5mg/L respectively.And the values of I and m revealed that the relative inhibitive strength of these metals on 2-CP degradation was Cu2＋Ni^2＋Cd^2＋.

关 键 词：2-氯酚 重金属 厌氧降解速率 抑制浓度 抑制动力学方程 

分 类 号：X171.5[环境科学与工程—环境科学]