INTEGRATION OF ATTACHED GROWTH AND SUSPENDED GROWTH METHODS FOR PROCESSING THE LIQUID WASTE OF PATHOLOGY LABORATORY OF SURABAYAE-LAB CLINICYAUWAN TOBING LUKIYONO, MOHAMMAD RAZIF AND MARITHA NILAM KUSUMAAbstract Laboratory waste is all solid and liquid waste produced by laboratory activities and other supporting activities. Laboratory waste can harm the surrounding environment if it is not managed or treated with liquid waste before it is put into a water channel or body. Laboratory waste is not only dangerous but also infectious. This study aims to treat the waste produced by the Surabaya E-Lab Clinic Pathology Laboratory using the integration of attached growth and suspended growth methods which were arranged in series using laboratory scale reactors to reduce pollution load of BOD, COD, TSS. The attached growth reactor is an anaerobic reactor equipped with green sand and activated charcoal. The suspended growth reactor is an aerobic reactor equipped with a rotor which functions to mix and increase dissolved oxygen needed by microorganisms. Wastewater was put into an anaerobic reactor which was directly filtered by green sand and activated charcoal, then entered the aerobic reactor rotated by the rotor with variations in the rotation speed of 50,100 and 150 RPM with processing time in these two reactors for 15, 27 and 31 hours.The lowest outlet concentration results for BOD, COD, TSS was 45 mg/L, 77 mg/L, 60 mg/L, respectively, which occurred at 50 RPM rotation and 31 hour rotation time, where only TSS parameters did not meet applicable wastewater quality standards in Indonesia. The highest removal efficiency for BOD,COD, and TSS at reactor outlets was 92%, 93%, 88%, respectively, at the 50 RPM rotation and 31 hour rotation times. |