EVALUATION OF LEACHATE DISCHARGE ON POND WATER QUALITY AROUND THE BENOWO SURABAYA FINAL PROCESSING SITE IN 2025

Abstract

Background: The Benowo landfill had the potential to contaminate the environment through leachate discharges containing organic and inorganic compounds. This contamination could affect the water quality of ponds located around the landfill and utilized by the community. Objective: The study aimed to evaluate the impact of leachate discharge on pond water quality around the Benowo landfill in Surabaya. Method: This study used a descriptive method with a qualitative approach and a cross-sectional design. The research object consisted of active ponds owned by residents located at a distance of 500, 1,000, and 1,500 meters from the landfill. Sampling occurred using a composite sampling technique and the samples were analyzed for pH, TDS, BOD, COD, and Fe parameters. Data was obtained from field observations and measurements, then presented in the form of tables and graphs. Results: The results showed that the water quality of ponds around Benowo landfill had decreased, on the parameters of BOD, COD, and Fe which exceeded the threshold of Class III quality standards according to PP No. 22 of 2021. The highest concentration was found at a distance of 500 meters from the landfill with BOD levels reaching 145 mg/L, COD 1042 mg/L, and Fe at 0.83 mg/L. The pH value ranged from 7.5-8.0 and TDS was still within the quality standard limit, which was <1,000 mg/L. These results indicated the potential for leachate contamination of active ponds used by the community for fish farming. Conclusion: The highest TDS and BOD values were found at 500 m, while COD and Fe fluctuated with a tendency to remain high up to 1500 m, influenced by water flow and surface runoff. The distribution of contaminants did not always decrease with distance, suggesting that leachate contamination is widespread and dynamic.