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In order to evaluate the processing efficiency of coagulation sedimentation on wastewater from dairy farm and to provide reference for wastewater treatment,an experimental study was carried out to investigate effects of coagulant dosage,types,pH,dosage of coagulant aids PAM on removal rate of COD,turbidity and SS in wastewater from dairy farm. The results showed that PAC displayed higher effectiveness in treatment; the removal rates of COD,turbidity and SS were61. 4%,86. 6% and 94. 5% respectively when pH was 11. 0,PAC dosage was 150 mg / L,and PAM dosage was 4 mg / L. The results indicated that coagulation sedimentation could reduce organic content of wastewater effectively and alleviate the load of subsequent biochemical treatment.
In order to evaluate the processing efficiency of coagulation sedimentation on wastewater from dairy farm and to provide for reference for wastewater treatment, an experimental study was carried out to investigate effects of coagulant dosage, types, pH, dosage of coagulant aids PAM on removal rate of COD , turbidity and SS in wastewater from dairy farm. The results showed that PAC displayed higher effectiveness in treatment; the removal rates of COD, turbidity and SS were 61.4%, 86.6% and 94.5% respectively when pH was 11. 0, PAC dosage was 150 mg / L, and PAM dosage was 4 mg / L. The results indicated that coagulation sedimentation could reduce organic content of wastewater effectively and alleviate the load of subsequent biochemical treatment.