_Recycling of the Greywater from Mosques in Oman

Oman is located within Arid and Semi-Arid regions, where water resources are very scarce. The national average rainfall is just 80-100 mm per year. With high temperatures (30 ºC to above 40 ºC) the evaporation is also high. Therefore, it is absolutely necessary to conserve and recycle water in Oman. The study aims to identify ablution water (the ritual washing of the exposed parts of the body, the face, hands and feet before each prayer called ablution) and to prove that it as one of the least polluted sources of greywater, by examining the properties of greywater and comparing its results with the results of other greywater, taking into account the criteria for reusing treated water, as well as developing appropriate treatment techniques. The study dealt with the use of solar energy to operate the treatment unit, and developed an appropriate design for the treatment unit. The study recommends using the total volume of greywater generated for non-potable purposes including rinsing, car washing, gardening and irrigation purposes. In this way, the greywater from mosques is recycled in the most beneficial way and at a lower cost in order to provide fresh water for future generations.