COAGULATION FOR TREATMENT OF SWINE SLAUGHTERHOUSE WASTEWATER
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Abstract
In this study, wastewater taken from Nam Phong swine slaughterhouse, Ho Chi Minh City, was used to evaluate treatment efficiency of common coagulants, including Alum (Aluminum Sulfate - Al2(SO4)3.18H2O), Poly-Aluminum Chloride (PAC) and Ferrous Sulfate (FeSO4.7H2O), using Jar-test system. Experiments were conducted using one-factor-at-a-time method to examine three variables: pH, stirring speed and coagulant dosages. The results show that both Alum and PAC perform over 90% removal of color, turbidity, COD and total phosphor from slaughterhouse wastewater at pH 7 with a stirring speed of 75 revolutions per minute (RPM) and average coagulant dosages (450 mg/L for Alum and 550 mg/L for PAC). Meanwhile, in the appropriate conditions at pH 10 and 75 RPM with a chemical dosage of 350 mg/L, COD and total phosphor (TP) removal efficiencies by Ferrous Sulfate exceed 87%, but those of turbidity and color only reach 25%. This finding could be a promising coagulation method as a pretreatment or adding method to swine slaughterhouse wastewater.