http://www.iaeme.com/IJCIET/index.asp 176 editor@iaeme.com International Journal of Civil Engineering and Technology (IJCIET) Volume 7, Issue 4, July-August 2016, pp. 176–187 Article ID: IJCIET_07_04_014 Available online at http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=7&IType=4 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication REUSE OF SPENT FILTER BACKWASH WATER Hanan A. Fouad Associate Prof. of Sanitary & Environmental Engineering, Faculty of Engineering at Shoubra, Benha University, Egypt Rehab M. El-Hefny Assistant Prof. of Sanitary & Environmental Engineering, Faculty of Engineering at Shoubra, Benha University, Egypt Mahetab Ali Mohamed Demonestrator at Civil Engineering Department, Elgazeera Higher Institute for Engineering and Technology, Egypt ABSTRACT 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. Key words: Backwash, Filtration, Reuse, Treatment, Water. Cite this Article: Hanan A. Fouad, Rehab M. El-Hefny and Mahetab Ali Mohamed, Reuse of Spent Filter Backwash Water. International Journal of Civil Engineering and Technology, 7(4), 2016, pp.176–187. http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=7&IType=4