腐熟污泥对废水中Cd(Ⅱ)与Zn(Ⅱ)的吸附性能研究  

Study on absorption of Zn(Ⅱ) and Cd(Ⅱ) from aqueous solution using composted sludge as absorbent

作　　者：游俏[1] 袁兴中[1] 曾光明[1] 李辉[1] 黄华军[1] 周梅芳[1] 谭险夷[1] 

机构地区：[1]湖南大学环境科学与工程学院环境生物与控制教育部重点实验室,长沙410082

出　　处：《环境工程学报》2011年第1期1-6,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50678062)

摘　　要：利用腐熟污泥作为一种重金属吸附剂,考察其对水中重金属锌和镉的吸附过程。实验数据的拟合采用了Pseudo-first Order和Pseudo-second Order 2种动力学模型以及Langmuir和Freundlich 2种吸附等温线模型;拟合结果表明,腐熟污泥对锌与镉的吸附过程符合Pseudo-second Order动力学模型,且相比Langmuir等温线模型,其更加符合Freundlich模型。吸附过程的影响因素较多,属于复杂的多层吸附。对影响吸附过程的因素进行分析,表明溶液的pH是一个重要的因素,在pH为2.5~7.5之间时,腐熟污泥对重金属的吸收效果较好;腐熟污泥的浓度对吸附过程的影响不是很明显;最佳的吸附时间为60 min。Composted sludge was investigated as a kind of heavy metal absorbent for absorbing zinc and cadmium from aqueous solution.Two kinetic models（Pseudo-first Order and Pseudo-second Order） and two isotherm models（Langmuir and Freundlich） were applied to fit the experimental data.It was shown that the adsorption process accorded with Pseudo-second Order mode.Meanwhile,compared with Langmuir adsorption isotherm model,the adsorption process followed Freundlich isotherm model well,which indicated that the adsorption process was a complex multi-layer adsorption and affected by many factors.The analyses of the influences of the factors on the adsorption process indicated that the solution pH was an important factor.When the pH value was from 2.5 to 7.5,higher adsorption rates of heavy metals could be achieved.The effects of composted sludge particle concentration were not very obvious.The best adsorption time was 60 min.

关 键 词：腐熟污泥 吸附 锌 镉 

分 类 号：X703[环境科学与工程—环境工程]