摘要
通过批量实验对比了活性污泥和粉末活性炭对结晶紫的吸附性能,进行了活性污泥吸附结晶紫的动力学研究,考察了搅拌速度和活性污泥/结晶紫比例对活性污泥吸附结晶紫的影响.结果表明,活性污泥对结晶紫的吸附等温方程同时符合Langmuir和Freundlich方程,而粉末活性炭对结晶紫的吸附更符合Freundlich方程;活性污泥对结晶紫具有很好地吸附性能,最大吸附量达到571.26mg·g-1,远高于粉末活性炭的131.09mg·g-1.应用假一级和假二级反应动力学模型对实验数据进行验证,表明活性污泥吸附结晶紫更符合假二级反应动力学模型.搅拌速度仅对转速低于500r·min-1时的污泥吸附速度有影响,吸附速度随着搅拌速度的增加而加快,但并不影响活性污泥对结晶紫的最终吸附平衡.当活性污泥/结晶紫比例较低时(10∶1,质量比),出水中结晶紫的浓度随着初始结晶紫浓度的增加而增加,而当初始比例为20∶1和50∶1时,初始结晶紫的浓度对出水几乎没有影响.
Crystal violet （CV） adsorption from aqueous solution on activated sludge （AS） and powdered activated carbon （PAC） was comparatively studied through batch jar tests. It was found that the adsorption isotherm of CV on AS satisfied both Langmuir and Freundlich models, while the adsorption of CV on PAC satisfied Freundlich model more than Langmuir model. The maximum adsorption capacity of CV on AS was 571.26 mg·g^-l , much higher than that on PAC, which was only 131.09 mg·g^-l . The adsorption of CV on AS was analyzed using pseudo first-order and pseudo second-order adsorption kinetic models, and the pseudo second-order kinetic model could better describe the adsorption. The impacts of stir speed and the ratio of AS/CV on CV adsorption were also investigated. Stir speed showed no effect on equilibrium CV concentration. At the AS/CV ratio of 10 ： 1, the equilibrium CV concentration increased with increasing initial CV concentration, while the initial CV concentration showed no influence on equilibrium CV concentration at the AS/CV ratio of 20：1 or 50： 1.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2008年第10期2856-2861,共6页
Environmental Science
基金
广东省水利厅科技计划项目(粤水科[2006]122号-2006-12)
'十一五'国家科技支撑计划项目(2006BAB17B06)
关键词
活性污泥
粉末活性炭
结晶紫
吸附
activated sludge
adsorption
crystal violate
powdered activated carbon
