Determination of the optimum organic coagulants dosage in tofu industrial wastewater treatment

Abstract

The research aim was to analyze the optimum dosage of moringa seed and tamarind seed as an organic coagulant in removing tofu wastewater pollutants using coagulation, flocculation, and sedimentation reactors. The first step is the manufacture of coagulant by processing the organic coagulant raw materials into powder and filtered using a 50 mesh filter and dried. The second step is to determine the dosage of coagulant using 4 variations of pH 5,6,7,8 using NaOH solution, and coagulant dosages obtained 2,3,4,5 gr/L. The third stage is an experimental test using the squenching batch reactor (SBR) method with TSS and COD parameter analysis. The effects confirmed that the coagulant of moringa seed had better ability than tamarind seed in removing TSS and COD, with the highest percentage reduction in TSS and COD at 3 gr dose of moringa seed. In addition, removal of TSS and COD using moringa seed or tamarind seed as coagulant was the most optimum at neutral pH 7-8. However, the treatment of tofu wastewater using either moringa seed or tamarind seed as coagulant using the coagulation-flocculation-sedimentation method in one reactor is not able to remove pollutants to meet the quality standards, so further treatment is needed.