杭锦2#土复合吸附剂对磷的吸附动力学
Research on the Growth Characteristics and Accumulation Ability to N and P of Eichhornia crassipes in Different Water Areas of Dianchi Lake
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摘要: 通过静态实验考察杭锦2#土/聚合硫酸铝复合吸附剂对生活污水中磷酸根的吸附特性,研究吸附过程的动力学模型,并从动力学角度探讨其吸附机理。结果表明,在杭锦2#土/聚合硫酸铝复合吸附剂用量5g·L-1、吸附时间60min、废水pH值6.0、温度25℃、磷初始质量浓度小于16.72mg·L-1条件下,磷酸根的去除率在96%以上;复合吸附剂对磷酸根的吸附动力学特征符合假二级方程,吸附速率在前10 min为内扩散控制,后期由膜扩散和内扩散共同控制,且膜扩散占主导地位;磷酸根的初始浓度越高,吸附质粒子的表观内扩散系数和表观传质系数越小;使用不同再生次数的再生吸附剂(添加量为5g·L-1)处理16.72mg·L-1含磷生活污,随着再生次数的增加,吸附能力有所下降,但磷酸根的去除率均大于89%。Abstract: In order to study the growth characteristics and accumulation ability to N and P of water hyacinth in different water areas of Dianchi Lake, Eichhornia crassipes were planted by fence facilities with the initial planting amount of 3kg