Utilization scheme of ablution water as an alternative water resource: a case study of istiqlal mosque, jakarta

Ablution water is one of the main domestic waste in the mosque as a place of worship. Its minimal contamination during uses has the potential to be used again as an alternative water resource to meet water needs in the mosque and reduce the consumption of clean water from the first of its source. Ablution water utilization scheme started by utilizing water to fulfill water needs from the category of water with the lowest quality to higher quality of processed water. Several water treatments processes are proposed in this utilization scheme. The potential of ablution water that can be reused as an alternative of water resource at the Istiqlal Mosque reaches 72.57 m3/day with savings of clean water usage up to 30.55%. According to the water supply charge toward low level tariff for household, the potential of annual cost saving is IDR 15,697,000. The application of utilization scheme of ablution water can reduce the consumption of clean water and have an impact on the sustainability of water supply at mosque.