Preliminary Study of Breakpoint Chlorination (BPC) at Tura Tea WWTP, Samarinda
Keywords:
Ammonia, Breakpoint chlorination, Calcium hypochlorite, Chlorine, WWTPAbstract
Population migration and growth in Indonesia have led to an increase in domestic wastewater production, which can reduce environmental quality if not treated properly. The main problem in this study is the high concentration of ammonia in the effluent of Tura Tea WWTP, Samarinda, which is 96 mg/L, exceeding the quality standard of Environmental Ministry of Indonesia No. 11 of 2025, which is 50 mg/L. High ammonia mixed with high chlorine is toxic and has the potential to form disinfection by-products. This study aims to evaluate the performance of wastewater management facilities and develop an optimization approach to improve effluent quality to meet quality standards. The research methods included field data collection and laboratory analysis of key parameters (TSS, BOD, COD, pH, ammonia, and total coliform) at the inlet and outlet points. The optimization process was carried out using the breakpoint chlorination method with calcium hypochlorite (Ca(OCI)2). The results showed that the optimal dose capable of effectively reducing organic pollutants was a chlorine dose of 200 mg/L, which produced a residual chlorine level of 3.55 mg/L with an ammonia removal efficiency of 80%, initially 96 mg/L to 19.2 mg/L. This study demonstrates that the chlorination-based disinfection process using calcium hypochlorite (Ca(OCI)2) in the final treatment stage can improve WWTP performance and ensure that effluent meets domestic wastewater quality standards in Indonesia.
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