Arsenate Removal by Coagulation Using Iron Salts and Organic Polymers


Ekoloji, 2010, Issue 74, Pages: 69-76


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Arsenic occurs naturally in the water in many parts of the world. The coagulation and flocculation method is used for arsenate removal from drinking water using ferric chloride, ferric sulfate, and ferrous sulfate. The effects of coagulant type and dosage on removal efficiency of arsenate are determined by considering the residual iron after sedimentation and filtration in the effluent. At the same time the impact of the type (cationic, anionic, and nonionic) and dosage of organic polymers on the removal efficiency of arsenate was investigated. Residual arsenate concentrations were decreased below 10 mg L-1 for ferric chloride and ferrous sulfate concentration of 30 and 80 mg L-1, respectively. Ferric chloride provided minimum and acceptable residual iron concentration (175 mg L-1) after sedimentation and filtration and it was determined as the most effective and economic coagulant type because it requires lower amounts than the others and produces minimum residual iron. The addition of cationic polyelectrolyte aided maximum arsenate removal efficiency although all types of polymers increased the efficiency of the treatment method. The percentage of removal reached a maximum level at the cationic polyelectrolyte concentration of 2.5, 2, and 3 mg L-1 for ferric chloride, ferric sulfate, and ferrous sulfate, respectively.


Arsenate removal, coagulation, iron salts, organic polymers, residual iron


  • Ali MA (2006) Arsenic contamination of groundwater in Bangladesh. International Review for Environmental Strategies 6, 329-360.
  • Anonymous (1998) Analytical chemistry of drinking water. APHA, AWWA and WPFC, Washington.
  • Anonymous (2000) Technologies and costs for removal of arsenic from drinking water. USEPA, EPA 815-R-00-028, Washington.
  • Anonymous (2005) TS 266 Water Intended for Human Consumption, Turkish Standards Institution, Ankara.
  • Bhattacharyya R, Chatterjee D, Nath B, Jana J, Jacks G, Vahter M (2003) High arsenic groundwater: mobilization, metabolism and mitigation - an overview in the Bengal Delta Plain. Molecular and Cellular Biochemistry 253, 347-355.
  • Bilici Baskan M, Pala A (2009) Determination of arsenic removal efficiency by ferric ions using response surface methodology. Journal of Hazardous Materials 166, 796-801.
  • Bissen M, Frimmel FH (2003) Arsenic - a review, part I: occurrence, toxicity, speciation, mobility. Acta Hydrochimica et Hydrobiologica 31, 9-18.
  • Chen RC, Liang S, Wang HC, Beyler MD (1994) Enhanced coagulation for arsenic removal. Journal of American Water Works Association 86, 64-78.
  • Çolak M, Gemici Ü, Tarcan G (2003) The effects of colemanite deposits on the arsenic concentrations of soil and groundwater in Iğdekoy-Emet, Kutahya, Turkey. Water, Air, Soil Pollution 149, 127-143.
  • Çöl M, Çöl C (2004) Arsenic concentrations in the surface, well and drinking waters of the Hisarcik, Turkey area. Human and Ecological Risk Assessment 10, 461-465.
  • Duker AA, Carranza EJM, Hale M (2005) Arsenic geochemistry and health. Environmental International 31, 631-641.
  • Edwards M (1994) Enhanced coagulation for arsenic removal. Journal of the American Water Works Association 86, 79-89.
  • Gemici Ü, Tarcan G (2004) Hydrogeological and hydrogeochemical features of the Heybeli spa, Afyon, Turkey: arsenic and the other contaminants in the thermal waters. Bulletin of Environmental Contamination and Toxicology 72, 1107-1114.
  • Gregor J (2001) Arsenic removal during conventional aluminium-based drinking water treatment. Water Research 35, 1659-1664.
  • Grohmann A (1985) Flocculation in pipes: design and operation, In chemical water and wastewater treatment. Gustav Fisher Verlag, Stuttgart.
  • Guerin T, Molenat N, Astruc A, Pinel R (2000) Arsenic speciation in some environmental samples: a comparative study of HG-GC-QFAAS and HPLC-ICP-MS methods. Applied Organometallic Chemistry 14, 401-410.
  • Han B, Runnells T, Zimbron J, Wickramasinghe R (2002) Arsenic removal from drinking water by flocculation and microfiltration. Desalination 145, 293-298.
  • Harvey CF, Ashfaque KN, Yu W, Badruzzaman ABM, Ali MA, Oates PM, Michael HA, Neumann RB, Beckie R, Islam S, Ahmed MF (2006) Groundwater dynamics and arsenic contamination in Bangladesh. Chemical Geology 228, 112-136.
  • Hering JG, Chen PY, Wilkie JA, Elimelech M (1997) Arsenic removal from drinking water during coagulation. Journal of Environmental Enginering 123, 800-807.
  • Hering JG, Chen PY, Wilkie JA, Elimelech M, Liang S (1996) Arsenic removal by ferric chloride. Journal of American Water Works Association 88, 155-167.
  • Karcher S, Caceres L, Jekel M, Contreras R (1999) Arsenic removal from water supplies in Northern Chile using ferric chloride coagulation. Journal of Chartered Institution of Water and Environmental Management 13, 164-168.
  • Lee Y, Um I, Yoon J (2003) Arsenic(III) oxidation by iron(VI) (ferrate) and subsequent removal of arsenic(V) by iron(III) coagulation. Environmental Science and Technology 37, 5750-5756.
  • Lytle DA, Sorg TJ, Frietch C (2004) Accumulation of arsenic in drinking water distribution systems. Environmental Science and Technology 38, 5365-5372.
  • McNeill LS, Edwards M (1997) Predicting As removal during metal hydroxide precipitation. Journal of American Water Works Association 89, 75-86.
  • Mok WM, Wai CM (1994) Mobilization of Arsenic in Contaminated River Waters. In: Nriagu JO (ed), Arsenic in the Environmnet, Part 1: Cycling and Characterization, John Wiley & Sons Inc., New York, 99-117.
  • Pande SP Deshpande LS, Patni PM, Lutade SL (1997) Arsenic removal studies in some groundwaters of West Bengal, India. Journal of Environmental Science and Health 7, 1981-1987.
  • Rodriguez VM, Capdeville MEJ, Giordano M (2003) The effects of arsenic exposure on the nervous system. Toxicology Letters 145, 1-18.
  • Sancha AM (2006) Review of coagulation technology for removal of arsenic: case of Chile. Journal of Health Population and Nutrition 24, 267-272.
  • Smedley PL, Kinniburgh DG (2002) A review of the source, behaviour and distribution of arsenic in natural waters. Applied Geochemistry 17, 517-568.
  • Song S, Lopez-Valdivieso A, Hernandez-Campos DJ, Peng C, Monroy-Fernandez MG, Razo-Soto I (2006) Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite. Water Research 40, 364-372.
  • Violante A, Ricciardella M, Gaudio SD, Pigna M (2006) Coprecipitation of arsenate with metal oxides: nature, mineralogy, and reactivity of aluminum precipitates. Environmental Science and Technology 40, 4961-4967.
  • Wang LK, Hung YT, Shammas NK (2005) Handbook of Environmental Engineering Volume 3: Physicochemical Treatment Processes. Humana Press, New Jersey.
  • Wang S, Mulligan CN (2006) Occurrence of arsenic contamination in Canada: sources, behaviour and distribution. Science of the Total Environment 366, 701-721.
  • Wickramasinghe SR, Han B, Zimbron J, Shen Z, Karim MN (2004) Arsenic removal by coagulation and filtration: comparison of groundwaters from the United States and Bangladesh. Desalination 169, 231244.
  • Yoshida T, Yamauchi H, Sun GF (2004) Chronic health effects in people exposed to arsenic via the drinking water: dose-response relationships in review. Toxicology and Applied Pharmacology 198, 243252.
  • Zouboulis A, Katsoyiannis I (2002) Removal of arsenates from contaminated water by coagulationdirect filtration. Separation Science and Technology 37, 2859-2873.