Research on the Treatment for Seasonal High Turbidity Raw Water
The heavy rainfall in the upstream of the Xijiang River Basin causes an increase in the turbidity of the downstream raw water between May and August each year,which has an impact on the production of downstream water companies.This article studied the treatment effect of two flocculants,including polymeric aluminum ferric chloride(PAFC)and polymeric ferric sulfate(PFS),and a coagulant aid,including potassium permanganate composite(PPC),on high turbidity raw water through static coagulation and stirring experiments.The experimental results showed that PAFC had a good treatment effect on medium and high turbidity raw water.When the turbidity of the raw water was below 200 NTU,10～20 mg/L of PAFC should be added separately.The treatment effect of PFS on medium to high turbidity raw water was equivalent to that of PAFC,and it had advantages in treating higher turbidity raw water.When the turbidity of the raw water reached 500 NTU,it was recommended to add 80 mg/L of PFS or 40 mg/L of PFS and 0.5 mg/L of PPC together.The remaining turbidity after treatment could meet the requirements of the water before filtration.
high turbidity raw waterwater purification agentcoagulant aidpotassium permanganate composite
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