Optimizing Energy and Water Efficiency in Automated Car-Wash Facilities in Saudi Arabia: A Sustainable Operations Framework

Abstract

-Automated car-wash facilities combine intensive water use with pumping, pressurization, air movement, heating, treatment, and control loads, creating a coupled water-energy problem that is especially consequential in Saudi Arabia. This review synthesizes recent evidence on car-wash wastewater treatment, water reuse, energy optimization, digital monitoring, Saudi water-resource conditions, and the Kingdom's evolving regulatory context. It also adds a transparent sector-scale estimate: a commercial business directory listed approximately 2,656 car-wash locations in Saudi Arabia in April 2026, while an earlier market assessment reported about 14 million professional washes in 2022. Applying published water-use intensities gives an indicative national commercial-wash demand of roughly 0.84-2.63 million m3 (approximately the same number of metric tonnes) of water per year at the 2022 wash volume; this is a scenario estimate rather than an official national inventory. The proposed framework integrates demand prevention, segregated collection, fit-for-purpose reclamation, hardness and scale control, energy-aware equipment operation, digital supervision, and performance governance. It responds directly to the transition away from manual washing at fuel stations, where Saudi requirements permit only automatic car-wash systems. The recommended operating package targets 70-80% water recovery where technically feasible, reserves softened or RO-quality water for scale-sensitive and final-rinse duties, and uses lower-grade reclaimed water for prewash, underbody and compatible brush stages. The framework provides concrete design, retrofit and monitoring actions to reduce freshwater use while protecting pumps, nozzles, heat exchangers, membranes and piping from fouling and limescale.