Effectiveness of Coagulation–Flocculation Using Poly Aluminium Chloride and Lime in Reducing COD of Textile Wastewater Containing Direct Dyes
DOI:
https://doi.org/10.61844/jemmtec.v5i01.1364Keywords:
limbah cair tekstil, koagulasi–flokulasi, PAC, kapur, COD.Abstract
Textile industrial wastewater generally contains a high organic pollutant load due to the extensive use of dyes and auxiliary chemicals during the dyeing process. One of the main parameters used to evaluate the level of pollution is Chemical Oxygen Demand (COD). This study aimed to evaluate the effectiveness of the coagulation–flocculation process using poly aluminium chloride (PAC) and lime as coagulants in reducing the COD value of textile wastewater generated from direct dyeing laboratory activities. The treatment process was carried out using a jar test method with coagulant dosage variations of 20 mL, 25 mL, and 30 mL at a concentration of 5%. COD analysis was performed using the closed reflux dichromate method. The results showed that the coagulation–flocculation process was able to significantly reduce COD levels. The highest COD removal efficiency was achieved at a coagulant dosage of 25 mL, reaching 74.85%, with a reduction in COD from 41,792 mg O₂/L to 10,512 mg O₂/L. At a dosage of 20 mL, the COD removal efficiency reached 62.27%, while increasing the dosage to 30 mL resulted in a decreased efficiency of 37.12% due to the restabilization of colloidal particles. Although a substantial reduction in COD was obtained, the final COD value remained above the textile wastewater discharge standard, indicating that further treatment is required. This study demonstrates that coagulation–flocculation using PAC and lime is effective as a primary treatment for textile wastewater; however, it is not sufficient as a standalone treatment method.
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