城市生活污水强化一级处理中絮凝剂的选择研究

Study on Flocculant Choosing for Enhanced Primary Treatment of Domestic Wastewater

用城市生活污水，对几种较常用的絮凝剂进行了单质和复合处理时的对比研究，并通过正交试验优化出最佳絮凝条件。研究表明在壳聚糖与硫酸铁复合的最佳絮凝条件下，对ＳＳ和浊度的去除率达８５ ％ 左右。强化去除率超过７５ ％ ，对ＣＯＤ 的去除率为７２－５ ％ ，强化去除率为６３－８ ％ 。对ＢＯＤ５ 的去除率和强化去除率分别为５６－４ ％ 和４３－５ ％ 。

In the orthogonal optimizational experiment of domestic wastewater treatment several kinds of popular flocculants are compared by single and joint dosages to find out the best flocculent conditions including the best dosage and dosing sequence.The result shows that under the best flocculation condition of chitosan ferric sulfate, a removal efficiency of 85% could be obtained for SS and turbidity,over 75% enhanced;and a removal efficiency of 72 5% could be obtained for COD,63 8% enhanced.Under the same condition a removal efficiency of 56.4% was obtained for BOD 5,45.3% enhanced.