PACl. Abstract. Keywords: Poly Aluminum Chloride (PACl), Ferric Chloride (FeCl 3 ), Conventional Coagulation and Flocculation.

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1 (FeCl 3 ) () : (/ / ) ph. () (FeCl 3) (THM S) (UV 254nm).. FeCl 3 THM S UV 254 DOC ph ph. ph UV 254nm DOC ( ) ()... (FeCl 3 ) () : Comparison of the Performance of Poly Aluminum Chloride (), Ferric Chloride (FeCl 3 ), in Turbidity and Organic Matter Removal; from Water Source, Case-Study: Karaj River, in Tehran Water Treatment Plant No. 2 Mohammad Abdolah zadeh Ali Torabian 2 Amir Hesam Hassani 3 (Received June, 28 Accepted Jan. 3, 29) Abstract Coagulation and flocculation are the principal units in water treatment processes. In this study, the Jar test was used to investigate the effects of the ph and on FeCl 3 and coagulants for further removal of turbidity, organic matter, aluminum, total organic carbon (), dissolved organic carbon (DOC), organic Aadsorption at a wavelength of 254 nm (UV 254 nm ), alkalinity, residual aluminum and ferric, total trihalomethans (TTHMs) in the Karaj River in the year These experiments were conducted through a bench scale study using conventional coagulation in the influent to Tehran Water Treatment Plant No. 2 (TWTP2).With normal ph levels, demonstrated more efficiency than FeCl 3 in removing turbidity,, UV 254 nm, and TTHMs. The lower coagulant consumption, high floc size, lower floc detention time, lower sludge production, lack of the need for ph adjustment in turbidity of 25 and the lower alum consumption were the advantages of application instead of FeCl 3 as a coagulant. Also, application was efficient at low turbidity (2 ), average turbidity (6 ), and high turbidity ( ) in, turbidity, UV254 nm, and DOC removal. Thus, is an economical alternative as a coagulant in TWTP2. Keywords: Poly Aluminum Chloride (), Ferric Chloride (FeCl 3 ), Conventional Coagulation and Flocculation.. M.Sc. of Environmental Engineering Water & Wastewater Eengineer, Maintenance and Operation of Tehran Water Treatment Plants Directory, (Corresponding Author) (+98 2) Abdollahzadeh.278@gmail.com 2. Assoc. Prof., Dept. of Environmental Engineering, University of Tehran 3. Assist. Prof., Dept. of Energy and Environment, Islamic Azad University of Tehran - - () ( ) Abdollahzadeh.278@gmail.com

2 .[] ( ).[].[] []. - ( ) ( ) () / DOC() ( ) / ph ( as CaCO 3 ) / UV 254 (/Cm) / SUVA(/mg.m) 7 THMFP(µg/l) 6 Specific Ultra Violet Absorption (FeCl 3 ) (). ph FeCl 3...[] (THM s )...[] :.[] Total Organic Carbon () 2 Disolved Organic Carbon (DOC) 3 Mutagenic 4 Teratogenic 5 Carcinogenic 24

3 . - ph DOC UV AL 2 O 3 -- N. ph.. SM DR/4 DOC. DR/4 / UV 254. MN DR/4 ( ) / UV 254 SUVA.. DOC () DR/4.[] THM S DR/4 ppb... FeCl 3 Nephelometric Method 2 HACH 3 Metrohm 4 Persulfate-ultraviolet Oxidation 53 C 5 Spectral Absorption Coefficient (SAC) 6 7 Floc 8 Merck Pro Analysi KHP 25

4 .. ) : I (.[] (EPA) [] -- UV 254 nm DOC KHP EPA 85-R Merck (C) SAC y Y=.85x.. R 2 =.9997 Abs UV 254 nm (/cm) (C) C UV

5 - - Al 2O 3 () ph () - /-/ /-/ /- /- < / () - / () - / () - / () - / () - / () - / () - / () - / uv 254 FeCl 3 DOC / uv 254 DOC / / / / / / / / / / / / / FeCl () - ( ) () FeCl 3-27

6 -- KHP. FeCl 3 UV 254 DOC. --. (/ ) - - / / / / / / ( ) - - / / / / / / UV 254 UV FeCl 3 / / / / / / / / / / / / / / UV 254 UV 254 / / Tur. Tur ( ) - ( FeCl 3) DOC FeCl 3 UV () DOC () - ( ) () FeCl () FeCl 3-28

7 Tur. Tur ( ) - ( FeCl 3) Tur. Tur ( ) - ( FeCl 3)..... T OC.. SAC Tur2 2 SAC ( ) FeCl 3 - / SAC Tur2 2 SAC FeCl 3 ( ) Tur. Tur ( ) - ( FeCl 3) Tur. Tur ( ) - ( FeCl 3) Tur. Tur ( ) - ( FeCl 3) 29

8 - : ph ph..... ph / / /.. ph ( )... SAC Tur2 2 SAC ( ) FeCl SAC Tur2 2 SAC ( ) FeCl 3 -. SAC Tur2 2 SAC ( ) FeCl 3 -. Tur2 2 SAC ( ) FeCl 3-3

9 . ( ) ( /)... l/s ) ( l/s.. :.() Zhang, G., and Wang, Z. (2). Mechanism study of the coagulant impact on mutagenic activity in water. J. Wat.Res, 34 (6), () () () () APHA., AWWA., WPCF. (25). Standard methods for examination of water and wastewater, 2 th Ed., Washington, D.C. 8- Randtke, S. J. (988). Organic contaminant removal by coagulation and related proces combinations. J. AWWA., 8 (5), USEPA. (999). Enhanced coagulation and enhanced precipitative softening guidance manual. Office of Water (467). 3