In this study several tests were conducted to investigate the possibility of
re-use the filter backwash water (FBWW) by re-introducing it with raw water
(RW) for treatment. FBWW in water purification plants is being thrown into
sewage plants without any benefit. The amount of wash water generated
estimated at a rate of (10-15%) of the amount of purified water in the plant.
The treatment of Backwash water depends on the need for re-use, either for
drinking or for irrigation purposes, depending on the compliance with the
standards in the water quality specifications. The FBWW resulting from Giza
water plant have been analyzed scientifically and mixed with RW at different
ratios (from 10% to 50%). The results of experiments showed that the best
mixing ratio was 40% FBWW to 60% RW, also the economic feasibility of
water reuse have been discussed