Analisis Pemakaian Bahan Kimia Pada Instalasi Pengolahan Air Minum PT. Moya Bekasi Jaya Khususnya Biaya Bahan Kimia Koagulan (Studi Kasus IPA PT. MBJ, Kec. Cikarang Selatan, Kab. Bekasi) Analysis Of Chemical Consumption at The PT. Moya Bekasi Jaya Drinking Water Treatment Plant: A Focus On Coagulant Costs (Case Study Of PT. MBJ WTP, South Cikarang District, Bekasi Regency)
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Abstract
Clean water is a basic necessity that plays a vital role in maintaining public health and supporting various life activities. To meet the demand for clean water in the Cikarang region and its surroundings, Perumda Tirta Bhagasasi collaborates with the private sector through the Water Treatment Plant (WTP) of PT Moya Bekasi Jaya (MBJ), which utilizes raw water from the Tarum Barat Canal. This study aims to evaluate the effectiveness of using Aluminum Sulfate (Alum) and Poly Aluminum Chloride (PAC) coagulants based on raw water quality, treatment results, and operational cost efficiency. The research methods include collecting primary and secondary data for the period of January–December 2025, analyzing laboratory test results (jar tests), evaluating the optimum coagulant dosage based on turbidity and pH parameters, and analyzing operational cost efficiency. The relationship between raw water turbidity and coagulant dosage was analyzed using linear regression. The results showed a strong correlation between raw water turbidity and the required coagulant dosage, with a coefficient of determination (R^2) of 0.9218 for Alum and 0.9507 for PAC. The jar test results indicated that PAC performed better than Alum when raw water turbidity exceeded 228.49 NTU. The efficiency of PAC usage became more evident at raw water turbidity levels above 300 NTU, with PAC being 4.7% more cost-effective, saving IDR 5.88/m³. Based on the research findings, PAC 8% is recommended as a more effective and efficient coagulant for high raw water turbidity conditions, while Alum 8% remains feasible for low to moderate turbidity levels to optimize water treatment operational costs.
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