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Vol. 25 No. 5 (2013): Vol 25 Issue 5

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Removal of Orthophosphate from Municipal Wastewater Using Chemical Precipitation Process in Ahvaz Wastewater Treatment Plant, Iran

https://doi.org/10.14233/ajchem.2013.13462
Mina Hormozi Nejad
Department of Environmental Health Engineering, Ahvaz Jondi Shapour University of Medical Science, Ahvaz, Iran
Afshin Takdastan
Department of Environmental Health and Environmental Technology Research Center, Ahvaz Jundi Shapur University of Medical Sciences, Ahvaz, Iran
Nematollah Jaafarzadeh
Department of Environmental Health Engineering and Environmental Technology Research Center, Ahvaz JundiShapur University of Medical Sciences, Ahvaz, Iran
Mehdi Ahmadi Mogadam
Department of Environmental Health Engineering and Environmental Technology Research Center, Ahvaz Jundi Shapur University of Medical Sciences, Ahvaz, Iran
Nezamaddin Mengelizadeh
Department of Environmental Health Engineering, Ahvaz Jondi Shapour University of Medical Science, Ahvaz, Iran

Corresponding Author(s) : Afshin Takdastan

afshin_ir@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 5 (2013): Vol 25 Issue 5

Abstract

Phosphate removal such as orthophosphate, from municipal wastewater has become an environmental necessity, since the excessive phosphate ion content in municipal wastewater causes water eutrophication. According to environmental protection organization of Iran, maximum permissible concentration of residual phosphorus in treated municipal wastewater is 1 mg/L P. Almost all the phosphorus in natural water and wastewater is available in the form of phosphate. Phosphorus compounds in wastewater, after hydrolysis and biodegradation, change to solution orthophosphates. In this research, poly aluminium chloride and bentonite clay as nature coagulant were added and with low chemical cost, bentonite effect in improving poly aluminium chloride in municipal wastewater treatment, has been investigated. The research is a bench scale experimental type. Samples were collected from influent wastewater to primary and effluent of secondary clarifier and then effect of pH and dose of coagulant investigated on orthophosphate removal efficiency. The result show optimal conditions of compound of polyaluminium chloride and bentonite for removal of orthophosphate, COD, BOD and TSS in pH = 7 and optimal dose 15.55 mg/L polyaluminium chloride and 5.55 mg/L bentonite in influent wastewater to primary clarifier has been obtained 71.83, 46.1, 48.9 and 63.5 %, respectively. Under optimal condition, orthophosphate concentration was reached to 1 mg/L. So this compound coagulant, in lowest dose and consequently chemical cost decrease, was selected as suitable coagulant in removal of orthophosphate of effluent of treatment plant.

Keywords

Eutrophication Orthophosphate removal Wastewater advanced treatment
Hormozi Nejad, M., Takdastan, A., Jaafarzadeh, N., Ahmadi Mogadam, M., & Mengelizadeh, N. (2012). Removal of Orthophosphate from Municipal Wastewater Using Chemical Precipitation Process in Ahvaz Wastewater Treatment Plant, Iran. Asian Journal of Chemistry, 25(5), 2565–2568. https://doi.org/10.14233/ajchem.2013.13462
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