Riyanto Haribowo
Waste Water Treatment Plant in RSU Mataram was started to use in 1991. After 12 (twelve) years of operation, it was found that some water quality parameters in the effluent was above quality standard. Therefore an evaluation that aims to assess the waste load on wastewater treatment plants (WWTP) RSU Mataram is needed. This evaluation of wastewater treatment plant was started by analising hospital waste load, waste treatment buildings (tanks, aeration tanks, sedimentation tanks and chlorination tanks) and analising activated sludge process. Waste water quality parameters analyzed were biochemical oxygen demand (BOD), chemical oxygen demand (COD), total content of suspended particles (TSS), NH3 and P-PO4. Furthermore, the factors causing reduced effectiveness of WWTP were also analyzed. Waste load analysis results showed that the outlet value percentage which is still above the quality standard parameters are TSS and Ammonia is very high, and for the BOD value percentage below the standard outlets reached 91.64% while the phosphate reaches 81.82% and COD 100%. For TSS parameter whose value is very high above the quality standard caused by problems in settling tanks where the sludge is difficult to sedimented so that it came out with the effluent. Results of the waste treatment building analysis shows lack of detention time in the initial tanks, so it must be resized to increase the waste settling time that can reduce the initial tank TSS levels up to 95.5%. To reduce ammonia levels up to 44.85 mg/(l/day), the detention time should reach 0.9 days or 21 hours, 14 minutes for that discharge into the aeration tub is limited to 112,000 l/day. As for the factors that cause reduced efficiency of WWTP which is because of limited experts, limited and expensive lab equipment, and the broken equipment.
Department of Water Resources, Faculty of Engineering, Brawijaya University, Malang 65145, Indonesia
