活性污泥絮凝沉降速率计算方法研究  

A novel method to compute the flocculation sedimentation rate of activated sludge

作　　者：何志江[1] 张源凯[1] 王洪臣[1] 齐鲁[1] 尹训飞 张晓军[1] 文扬[1] 

机构地区：[1]中国人民大学环境学院,北京100872

出　　处：《环境污染与防治》2015年第12期35-40,共6页Environmental Pollution & Control

基　　金：国家科技重大专项(No.2013ZX07314-001)

摘　　要：污水处理厂二沉池的运行效率受活性污泥沉降行为的影响十分显著,由于缺少有效的监测手段,有关活性污泥絮凝沉降速率的研究开展较少。基于固体一维通量的连续性方程,提出了一种计算活性污泥絮凝沉降速率的新方法。结果表明:活性污泥的絮凝沉降速率随着沉降柱深度的加深而增加,随絮凝沉降时间的增加而减小;活性污泥初始浓度和离子强度对絮凝沉降速率有很大影响,当活性污泥初始质量浓度从195mg/L增加到815mg/L时,最大絮凝沉降速率可从4.6cm/min增大到12.8cm/min;铝盐投加量从0mg/L增加到20mg/L时,最大的絮凝沉降速率可从3.9cm/min增大到10.1cm/min。The operating efficiency of secondary settling tank was affected by activated sludge sedimentation behavior in waste water treatment plants. However, there were few studies focused on the sludge flocculation sedimentation rate due to the lack of effective monitoring means. Based on the continuity equation for the solid one-dimensional flux,a new method for calculating the sludge flocculation sedimentation rate was introduced. The results showed that flocculation sedimentation rate decreased with the increase of time and the decrease of settling column height. In addi- tion,the initial sludge concentration and ionic strength had a great influence on the floceulation sedimentation rate. When the initial sludge concentration increased from 195 mg/L to 815 mg/L, the maximum flocculation sedimentation rate was increased to 12.8 cm/min from 4.6 cm/min; when the dosage of aluminium salts increased from 0 mg/L to 20 mg/L, the flocculation sedimentation rate increased to 10.1 cm/min from 3.9 cm/min.

关 键 词：固体一维通量 絮凝沉降速率 活性污泥浓度 离子强度 

分 类 号：X703[环境科学与工程—环境工程]