M.H Davood Abadi Farahani - Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
M Borghei - Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
V Vatanpour - Faculty of Chemistry, Kharazmi University, Tehran, Iran

Scarcity of water, large quantities of cooling tower blowdown water and increasing of water price lead torecent research about blowdown water treatment for reuse. Pre-treatment may constitute up to one-fourthof the total costs of a membrane desalting facility. By using conventional coagulation and pre-filtrationplants for pre-treatment, significant cost savings may be realized. We used coagulation/RO hybrid processto obtain increasing RO water flux and service life. When we used pre-treatment method before RO, theRO water flux ۳۳ percent increased. Also COD, turbidity and conductivity was decreased. Pre-treatedwater was proper feed for RO in terms of SDI۱۵ and turbidity.

Reverse Osmosis, Membrane Filtration, Pre-Treatment, SDI, Coagulation