Effectiveness of Anaerobic Aerobic Biofilter System in Reducing BOD, COD, Ammonia, and Phosphate in PKU Muhammadiyah Hospital Surabaya in 2024

Abstract

The wastewater from PKU Muhammadiyah Hospital Surabaya that has been treated still contains phosphate and ammonia that do not meet the quality stand-ards of the Governor of East Java Regulation Number 72 of 2013. High levels of phosphate and ammonia should not be discharged directly into water bodies be-cause they can cause various environmental problems. The purpose of this study was to determine the effectiveness of the anaerobic aerobic biofilter system of the wastewater treatment plant in reducing BOD, COD, ammonia, and phosphate at PKU Muhammadiyah Hospital Surabaya. This study was designed using a de-scriptive research method. The research variables were the anaerobic aerobic bio-filter system of the wastewater treatment plant at PKU Muhammadiyah Hospital Surabaya by observing the decrease in BOD, COD, ammonia, and phosphate levels. The laboratory results of BOD, COD, ammonia, and phosphate levels were analyzed descriptively, referring to the Governor of East Java Regulation Number 72 of 2013 concerning Wastewater Quality Standards for Industry and/or Other Business Activities. Based on the results of laboratory test analysis, it shows that the wastewater treatment plant has been effective in reducing BOD (65.51%) and COD (70.65%), but is less effective in reducing ammonia and phosphate (28.66%). The quality of wastewater discharge from PKU Muham-madiyah Hospital Surabaya still exceeds the quality standards for the ammonia parameter, which is 0.144 mg/L, and the phosphate of 3.917 mg/L in accordance with the Regulation of the Governor of East Java Number 72 of 2013. Sugges-tions for the hospital are to monitor and evaluate the Anaerobic Aerobic Biofilter. Identify effective bacteria for seeding in the equalization tank so that the outlet discharge is in accordance with the quality standards.