沉淀池排泥水回流强化混凝工艺参数研究

Study on Processing Parameters of Sedimentation Tank Sludge Water Reflux Coagulation

通过混凝烧杯试验进行沉淀池排泥水回流强化混凝效果的研究,分析PAC投药量、排泥水浊度及回流比参数的选择对排泥水回流工艺强化混凝效果的影响。结果表明,在PAC投药量低于30 mg/L,沉淀池排泥水浊度为16~40 NTU,回流比为2%~10%之间,沉淀池排泥水工艺能促进水中胶体絮凝,强化混凝效果,提高出水水质;并且利用设计正交试验得出,最优回流条件为:排泥水回流比=6%,PAC投药量=25 mg/L,排泥水浊度=30 NTU,比无回流节省投药量28.6%。

Through coagulation beaker test, research on coagulation effect of sedimentation tank slduge reflux was carried out, and the effects of PAC dosage, sludge turbidity and reflux ratio parameters on sludge reflux coagulation were analyzed in this study. The research results show that when the dosage of PAC was less than 30 mg/L,muddy water turbidity was from 16 to 40 NTU, and reflux ratio was from 2% to 10%, the sedimentation tank sludge water can promote the process of colloid flocculation, strengthen the coagulation effect, and improve the water quality. Besides, by way of the orthogonal test, it obtained the optimal reflux conditions： sludge water reflux ratio = 6%, PAC dosage=25 mg/L, sludge water turbidity= 30 NTU, and dosage can be saved 28.6% compared with the sludge water without reflux.