فصلنامه علمی

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشکده عمران و محیط زیست ، دانشگاه صنعتی امیرکبیر،تهران،ایران

10.22061/tej.2008.1311

چکیده

هدف از این بررسی، مقایسه ماده منعقد کننده پلی آلومینیوم کلراید PACl)) با کلراید فریک، بهینه سازی فرآیند و بررسی استفاده توأم آن با بنتونیت بر بازدهی  کدورت و همچنین بررسی میزان آلومینیوم باقیمانده با مصرف PACl در مقایسه با آلوم در آب خام تهران، بوده است. در این راستا، نمونه هایی از آب خام ورودی به تصفیه خانه آب جلالیه تهران برداشته شد. در فاز اول با آزمایش جار، غلظتهای بهینه دو ماده منعقد کننده کلراید فریک و پلی آلومینیوم کلرایدمقایسه شد. غلظت بهینه برای حذف کدورت، برای کلرید فریک mg/L 40 و برای PACl mg/L 35 بدست آمد.  در فاز دوم، با اضافه کردن بنتونیت (به میزان 20 میلی گرم بر لیتر)،  غلظت بهینه برای  کاربرد کلراید فریک  و PACl به ترتیب به mg/L 25 و mg/L 15 کاهش یافت. نتایج حاصل از فاز سوم نشان داد که غلظت یون آلومینیوم باقیمانده در آب با مصرف PACl، در مقایسه با آلوم، کاهش یافته و به حدود استاندارد مجاز (mg/L  2/0) نزدیکتر است

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Application of Polyaluminum Chloride (PACl) in turbidity removal of Tehran drinking water- Case study: Jalalieh water treatment plant

نویسندگان [English]

  • S.M.R. Alavi Moghadam
  • A. Bani Hashemi
  • R. Maknoon
  • M. Nik Azar

Faculty of Civil Engineering and Environment, Amirkabir University of Technology, Tehran, Iran

چکیده [English]

The main aims of this study were to compare the effectiveness of Polyaluminum Chloride (PACl) and Ferric Chloride, to optimization the coagulation/flocculation process, to investigate the effect of adding bentonite (as a coagulant aid) and to compare the residual Aluminum after adding PACl and Alum. Samples were collected from influent of Jalalieh water treatment plant, Tehran, Iran. In the first phase, the effectiveness of PACl and Ferric Chloride was compared. In this phase, the optimum coagulant dosages were 40 and 35 mg/L for Ferric Chloride and PACl, respectively. In the second phase, with adding 20 mg/L of bentonite, the optimum coagulant dosages were reduced to 25 and 15 mg/L for Ferric Chloride and PACl, respectively. The results of third phase of this study showed that PACl leaves less  residual Aluminum  than Alum.

کلیدواژه‌ها [English]

  • Poly Aluminum Chloride (PACl)
  • Ferric Chloride
  • Aluminum
  • Residual Aluminum
  • Tehran Drinking Water
  • Water Purification

[1] Qasim S.R., Motley E.M. and Zhu G., Water Works Engineering. Prentice-hall, Inc., 2004. [2] Shamansouri M.R., Neshat A.A., "Comparison of PAC, Alum and Ferric Chloride in TOC and total coliform removal", Journal of Water and Wastewater, Iran.Vol.48, 2003, pp. 39-44. [3] HDR Engineering, Inc.; Handbook of Public Water Systems. John Wiley & sons, Inc.; 1991. [4] Shen Y.H. and Dempsey B.A., "Synthesis and Speciation of Polyaluminum Chloride for Water Treatment", Environment International, Vol. 24, 1998, pp. 899-910. [5] LaMer V.K. and Healy T.W., "AdsorptionFlocculation Reactions of Micromolecules at the Solid-Liquid Interface", Rev.Pure App.Chem. Vol. 13, 1963, pp. 112-132. [6] Srinivasan P.T. and Viraraghavan T., "Characterization and Concentration Profile of Aluminum During Drinking Water Treatment " Water SA, Vol. 28, No.1, 2002, pp. 99-106. [7] Flaten T.P.," Aluminium as a Risk Factor in Alzheimer's Disease, with Emphesis on Drinking Water ", Brain Research Bulletin, Vol. 55, No. 2, 2001, pp. 187-196. [8] Gauthier E., Fortier I., Courchesne F., Pepin P., Mortimer J. and Gauvreau, D., "Aluminum Forms in Drinking Water and Risk of Alzheimer's Disease", Environmental Research Section A, Vol. 84, 2000, pp. 234-246. [9] Benschoten J.E. and Edzwald J.K., "Chemical Aspects of Coagulation Using Aluminum Salt-I: Hydrolytic Reaction of Alum and Polyaluminum Chloride", Water Research, Vol. 24, No. 12, 1990, pp.1519-1526. [10] Benschoten J.E. and Edzwald J.K., "Chemical Aspects of Coagulation Using Aluminum Salt-I: Coagulation of Fluvic Acid Using Alum and Polyaluminum Chloride", Water Research, Vol. 24, No. 12, 1990, pp.1527-1535. [11] Ratnaweera H.C., Ødegaard H. and Fettig J., "Coagulation with Prepolymerised Aluminium Salts and Their Influence on Particle and Phosphate Removal", Water Sci. Technol., Vol. 26, 1992, pp.1229-1237. [12] Diamadopoulos E. and Vlachos C., "Coagulation-Filtration of a secondary Effluent by Means of Pre-Hydrolyzed Coagulants", Water Sci. Technol., Vol. 33, No. 10, 1996, pp.193-201. [13] Kang M., Kamei T. and Magara Y., "Cmparing Polyaluminum Chloride and Ferric Chloride for Antimony Removal", Water Research, Vol. 37, 2003, pp.4171-4179. [14] Hach DR400 spectrophotometer procedure manual, Method No: 8012 for Aluminum, Hach Company, 2003. [15] http://www.epa.gov/safewater/mcl.html, Access date, 2007.