摘要
以剩余污泥为吸附剂,研究其对混合染料废水中活性黑KN-B和酸性大红G的吸附行为,考察了吸附动力学、吸附等温线、离子浓度、废水pH,以及染料质量比对吸附的影响。结果表明,污泥对RB KN-B和AR G的混合染料吸附迅速,时间可以控制在30 min;RB KN-B的吸附量是AR G的2.4~2.5倍;其吸附过程可以用假二级动力学方程进行描述和预测。Langmuir方程可以较好地描述污泥对RB KN-B和AR G的吸附,而混合染料MD的吸附更符合Freundlich方程。污泥对RB KN-B的吸附量在pH〈11范围内比较稳定;AR G则在pH≤2时吸附量较高,pH 2~4之间吸附量急剧下降,pH4~11之间吸附量相对稳定;混合染料中染料所占比例对单个染料去除率影响较小,但对混合染料总的去除率影响较大。
Excess activated sludge（ EAS） was employed as an adsorbent for the removal of binary mixtures of dyes from aqueous solution. The binary solution included reactive black KN-B（ RB KN-B） and acid red G（ AR G）. The effects of adsorption kinetics,adsorption isotherms,ion concentration,pH and mass ratio of dyes on mixed dyes removal efficiency were studied. It was found that the EAS adsorbed mixed dyes in a short time and the adsorption time could be controlled in 30 minutes. The adsorption kinetic data fitted well in with the pseudo second order modle. The adsorption of RB KN-B and AR G on EAS obeyed the Langmuir isotherm model. While the Freundlich isotherm model gave a better fit to the adsorption of mixed dyes. The EAS had a relatively steady adsorption capacity of RB KN-B at pH 〈11. A higher adsorption capacity of AR G was obtained at pH≤2,but the adsorption capacity decreased at pH values between 2 to 4. The EAS had a relatively steady adsorption capacity of AR G at pH 4—11. The ratio between RB KN-B and AR G had a greater effect on the removal rate of mixed dyes,but a smaller effect on the removal rate of single dye.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第1期175-180,共6页
Chinese Journal of Environmental Engineering
基金
梅州市科技局
嘉应学院联合立项项目(2012KYA10)
关键词
剩余污泥
混合染料
活性黑
酸性大红
吸附
excess activated sludge
mixed dyes
reactive black
acid red
adsorption
