Coagulation-Flocculation Treatment of Slaughterhouse Wastewater using Calcium Carbonate and Assessment of Asian Green Mussel (Perna viridis) Shells as Aleternative Coagulant Source

Author : Perez Jr., Abraham Lindayen
Major Adviser : Laurio, Michael Vincent O. 
Committee Members : Capunitan, Jewel A.; Guerrero, Gino Apollo M. 
Year : 2017
Month : June
Type : Thesis
Degree: BS
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Coagulation-flocculation experiment was done using laboratory grade calcium carbonate and Asian green mussel shells as coagulants in treating abattoir wastewater. The slaughterhouse wastewater obtained at the Slaughterhouse and Meat Processing Complex of University of the Philippines at Los Baňos was characterized and was found to have Total Suspended Solids (TSS) concentration of 120 g/L, Chemical Oxygen Demand (COD) concentration of 3540 mg/L and color of 2525 PCU. The effect of varying the pH in the coagulation-flocculation treatment of slaughterhouse wastewater was assessed and it was found that the best pH was 3.0. The effect of varying the coagulant dosage was also assessed and the best dosage found was 100 g/L of laboratory grade calcium carbonate. The effectiveness of calcium carbonate as a coagulant for the treatment of slaughterhouse wastewater was assessed and was found to have total suspended solids, chemical oxygen demand and color removal percentage of 86.48%, 86.72% and 80.40%. The Asian green mussel shells were pulverized and were sieved into mesh 100 and its effectiveness as an alternative coagulant was also assessed at the best pH and coagulant dosage obtained from using the laboratory grade calcium carbonate. Using One-Way Analysis of Variance, it was found out that the Asian green mussel shells were as effective as the laboratory grade calcium carbonate in reducing the TSS and color contaminants of the wastewater at the same pH (3.0) and dosage (100g/L). Though the final COD of the treated wastewater exceeded the limit of DENR Standards, the final TSS and color of the treated sample did not.

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