Abstract
Targeting to small municipalities where may not be developed large scale sewerage system for long term in the Philippines, appropriate community size for domestic wastewater treatment utilizing Johkasou was studied in view point of construction cost. 11 cases were set at varying in size of residencial area, housing density, and aspect ratio on residencial area. By generating random number, 50 samples for each case, 550 samples in total were made, and design of sewer pipe network was conducted. The total length of sewer pipe network depended on not only housing density but also size of residential area and aspect ratio of the residencial area. On establishing communities for small scale wastewater treatment facilities applying Johkasou, in case size of residential areas are set at 0.25, 0.5 and 1.0 hectar, minimum numbers of housing density were set at 18, 15 and 11 households per hector respectively through sensitivity analysis, which can be realized with lower cost comparing to individual Johkaso installing to each household.
