Source and rate of water consumption in carwashes of Kermanshah metro-city, and fate of produced wastewater

From the standpoint of environmental protection and effective utilization of water resources, reuse of carwash water is an important issue around the world. In this cross-sectional descriptive study, the source of water and its consumption rate in carwashes of Kermanshah metro-city were determined. In this manner by referring to the related guild, list of all active carwashes in Kermanshah city were collected, the city is divided into three regions and randomly 16 units in each region were selected for further investigation. Totally 48 carwash were surveyed and parameters like source of water, water consumption per car, type of used detergent, existence and type of wastewater treatment system were determined. The results showed that the well water (ground water) with 77.1% was the main source of water in the surveyed carwashes followed by treated tap water with 22.9%. 91.7% of the carwashes equipped with bar-screen and only in 35.4% of studied carwashes the grit removal unit was seen. All the carwashes discharged the wastewater to the municipal sewerage system without further treatment.