Biodegradation of COD in Household Wastewater with Aerobic Biofilm Technology by Adding Sediment Drainage SewerageSri Sumiyati, P. Purwanto, Endro Sutrisno, S. Sudarno, Jalu Arthawidya and Humam IzzudinE3S Web Conf., 31 (2018) 03015DOI: https://doi.org/10.1051/e3sconf/20183103015