SBR活性污泥吸附水中重金属离子的研究

研究了SBR活性污泥对重金属离子(Cu2+、Zn2+、Mn2+、Fe3+)的吸附作用。结果表明:在30℃温度下,pH为5时,其对Cu2+、Zn2+、Mn2+的去除率达到最大值50%左右;当pH为3时,对Fe3+的去除率达到最大值73.6%。吸附动力学过程可用二级吸附速率方程描述。在10~30℃温度范围内,随着温度的升高,Cu2+、Zn2+、Mn2+、Fe3+的去除率分别由54.6%、46.3%、45.3%6、8.9%,增大到58.6%、51.3%、49.6%、73.6%。当重金属离子初始质量浓度为50 mg/L,污泥投加量为0.2 g时,Cu2+、Zn2+、Mn2+和Fe3+的去除率达到最大值,分别为61.5%、54.3%、53.3%和76.2%。吸附等温线结果表明,Cu2+、Zn2+、Mn2+、Fe3+在吸附剂上的吸附可用Freundlich方程描述。

Study on adsorption of heavy metal ions from aqueous solution by SBR activated sludge

The absorption of heavy metal ions such as Cu^2＋,Zn^2＋,Mn^2＋,and Fe^3＋ was studied using SBR activated sludge.The results showed that when the temperature was 30℃,the maximum removal rate of Cu^2＋,Zn^2＋,and Mn^2＋ was about 50% at a pH value of 5 and the maximum removal rate of Fe^3＋ was 73.6% at a pH value of 3.The absorption dynamics followed second-order kinetics.The removal rates of Cu^2＋,Zn^2＋,Mn^2＋,and Fe^3＋ increased from 54.6%,46.3%,45.3%,68.9% to 58.6%,51.3%,49.6%,and 73.6%,respectively,when the temperature increased from 10℃ to 30℃.When the initial concentration of metal ions was 50mg/L and sludge dosage was 0.2g,the removal rates of Cu^2＋,Zn^2＋,Mn^2＋,and Fe^3＋ increased to their maximum values,which were 61.5%,54.3%,53.3%,and 76.2%,respectively.The experimental data of the adsorption isotherm indicated that the absorption process of Cu^2＋,Zn^2＋,Mn^2＋,and Fe^3＋ could be represented by the Freundlich equation.