The Effectiveness of Coagulation-Flocculation and Filtration-Adsorption Combination Using Anionic Surfactant for COD Removal on Contaminated Well Water
DOI:
https://doi.org/10.32493/jitk.v10i2.61040Keywords:
Anionic surfactants, Coagulation, Flocculation, Filtration, AdsorptionAbstract
Well water contaminated with hydrocarbons is generally characterized by high COD levels and acidic pH conditions, making it fail to meet clean water quality standards. This study aims to evaluate the effectiveness of a combination of anionic surfactants Linear Alkylbenzene Sulfonate, the role of ferric chloride and lime as coagulants in the coagulation and flocculation processes, and the filtration-adsorption process in improving water quality. Experiments were conducted with varying LAS concentrations (200–1000 ppm) through the stages of pretreatment, coagulation-flocculation, and filtration using silica sand, manganese, and activated carbon media. The results showed that the addition of LAS surfactant helped raise the pH toward neutral conditions. The optimum pH was achieved at a surfactant concentration of 400 ppm, with a pH of 7. The combination of coagulation-flocculation and filtration-adsorption processes was able to significantly reduce COD. The highest COD reduction efficiency was achieved in Treatment Variation 2 with filtration-adsorption at 85.3% at a concentration of 400 ppm, thereby meeting water quality standards (<10 mg/L). However, an excessive increase in LAS concentration reduced treatment efficiency due to adsorbent saturation and micelle formation. Overall, this combined method proved to be effective and practical for treating hydrocarbon-contaminated well water.
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