pH值及藻类影响低温低浊淠河水混凝的实验研究

Effect of p H and Algae on Coagulation of Pihe River with Low Temperature and Low Turbidity

通过淠河水低温低浊混凝烧杯实验,探讨聚合氯化铝(PAC)在最佳投加量情况下调节原水p H后,浊度去除率与p H值的关系、p H变化情况及藻类对去除浊度的影响。结果表明,水体的p H值对于低温低浊水影响显著,p H值越小,混凝效果越差,最佳p H值为7.4左右,同时p H变化量在0.3以内;有藻类时,PAC为碱性才有一定的去除效果,但去除率一般在30%以下。在实际应用当中,先去除藻类并适当调节p H有助于提高浊度处理效果。

By coagulation beaker experiments of the Pihe River with low temperature and low turbidity,this thesis investigates the poly-aluminium chloride（ PAC） used in the optimum dosage of circumstances and adjusting p H of raw water,and the relationship between the turbidity removal rate and p H value,p H changes and the effects of algae on turbidity removal. The results show that the p H value has significant influence on coagulation of the water with low temperature and low turbidity water： the smaller value of the p H,the worse the coagulation effect is; the best p H value is about 7. 4,while p H changes within 0. 3. When the algae are present,there is only certain removal in alkaline,but removal is generally 30% or less. In actual application,we should first remove the algae and appropriatly adjust p H to improve turbidity treatment effect.