Paper Title
Study of Potential Planned and Unplanned Domestic Wastewater Reuse for Pollutant Load Reduction and WQ Management in Urban Area: Case of Bandung City

Abstract
The issue of wastewater reuse has been increasingly of interest particularly associated with an attempt to reduce a pollutant load of receiving water body and in aware of depleting water resource. Couples of wastewater reuse practices have been shown worldwide, including those in developed and developing countries. The study attempts to identify different schemes of potential domestic wastewater reuse in the city of Bandung, Indonesia. Result of this study would be of benefit for the future step in mapping of potential domestic wastewater reuse for the whole city based on various scales of wastewater quantity generated i.e. micro-, meso-, and macro-scales. Different schemes of potential domestic wastewater reuse were differentiated with respect to whether treatment system is required (planned scheme) or no treatment is necessary (unplanned) for reuse purpose. Mixed and specific grey water from ablution were examined and evaluated in this study. The result showed that mixed grey water was considered as planned grey water reuse scheme which requires treatment before reuse application indicated by its quality as it compares with Government Regulation (PP 82/2001) for Class II or other standards adopted by other studies. This includes parameters of BOD, COD, NH4-N and surfactant that have value of 105 mg/L, 780 mg/L, 9.3 mg/L, 462 mg/L respectively. Referring to previous study, mixed grey water in the study area counts for 60-178 L/cap/day. On the other hand, the quantity of ablution grey water shows the average amount of 2.2 L/person/time, which equals to 11.2 L/person/day (five times prayer each day) . The quality of ablution grey water indicated values below standard for irrigation purpose under Class III and IV for parameters such as pH, Total Dissolved Solids, and coli form. The result generally reflects a potential direct application, classified as unplanned wastewater reuse, since they meet the required standard of Class III and IV, and only slightly higher than that for Class II category. Keywords - Wastewater Reuse, Domestic Sewage, Grey Water, Planned, Unplanned Wastewater Reuse.