REMOVAL OF ORGANIC MATERIALS AND COLIFORM OF DOMESTIC WASTEWATER THROUGH SOILSEddy Setiadi Soedjono, Salni Oktaviani Saiful, Alfan Purnomo, Adhi Yuniarto, Wahyono Hadi and Nurina Fitriani
Most densely populated housing in Surabaya is not served by sewerage system yet. Most of households in Surabaya are served by septic tanks or latrines mainly for the blackwater. Seepage from septic tanks soak away and latrines is very susceptible for health especially when the neighborhood used local groundwater for domestic purposes. It is regulated that soak away and latrines must be at least 10 m from groundwater sources like dug wells. This research is aimed to study the organic removal and total coliform from the tanks and latrines as it is regulated. Laboratory scale reactors are constructed of PVC type upflow reactors with 100 cm and 50 cm height to access such removal. COD, BOD, and total coliform of 100 cm height reactor is 58%, 76%, and 98%, respectively (with influent concentration of 1.720 mg COD/L, 688 mg BOD/ L, and 1,700 MPN total coliform/100 mL). Depending on soil types, organic and total coliform removal is significantly reduced along the groundwater flow, especially in an undisturbed soil.