EFEKTIFITAS BIOFILTER DENGAN MEDIA KONTAK BATU VULKANIK UNTUK MENGOLAH EFLUEN AIR LIMBAH DOMESTIK PADA TANGKI SEPTIK KONVENSIONAL

Biofilter septic tank is one of the domestic wastewater treatment technology uses contact media in processing wastewater. contact media that can be used made from plastic or local material such as volcanic scoria. this research is an applied research in order to test the efectiveness of volcanic scoria as contact media. location of this research is badung regency, bali. research conducted by built biofilter wastewater treatment unit at research location that have been selected by doing first step that is designing biofilter septic tank in accordance with the location and teoritically. wastewater from conventional septic tank at research location flowed into biofilter tank and left in the certain time to grow the biofil which will process the wastewater. in certain time, wastewater quality was tested and counted the decrease percentage of wastewater concentration content. the research result showed that the biofilter septic tank is not effective to treat wastewater effluent from conventional septic tank because it can only reduce the concentration of wastewater content about 48,74%. the parameters that not comply the wastewater standard such as free ammonia, bod5, and cod were reduced each about 82.15%, 45.61%, and 46.04%