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活性污泥胞外聚合物(EPS)对Pb2+吸附性能的研究

Keywords: 活性污泥,胞外聚合物(EPS),吸附,重金属,响应面

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Abstract:

以活性污泥中提取的胞外聚合物(EPS)作为吸附剂,考察了pH、EPS投加量及温度对Pb2+吸附效果的影响,通过响应面法对其吸附条件进行优化,并对其热力学吸附特征和吸附动力学进行了探讨。研究结果表明,EPS对Pb2+的最佳吸附条件组合为:温度35℃,pH4.2,m(EPS)∶m(Pb2+)=2.5∶1,在此条件下Pb2+实际去除率达到89.16%。EPS对Pb2+的吸附等温线能较好地用Langmuir方程和Freundlich方程来描述,但更适合用Langmuir方程拟合,3种不同温度下(20、30、40℃)最大单分子层吸附量分别为0.9229、1.0129、1.1191mg·mg-1。EPS对Pb2+的吸附过程可以用准二级动力学方程描述,并在240min达到吸附平衡,平衡时理论最大吸附量为0.45mg·mg-1。

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