en عمومى General مقاله اصیل Original Article <p dir="ltr">Background: Nitrate is an acute and well-known hazardous contaminant, and its contamination of water sources has been a growing concern worldwide in recent years. This study evaluated the feasibility of nitrate removal from water using the traditional coagulants alum and ferric chloride with lower concentrations than those used in the conventional coagulation process.<br> Methods: In this research, two coagulants, alum and ferric chloride, were compared for their efficiency in removing nitrate in a conventional water treatment system. The removal process was done in a batch system (jar test) to examine the effects of coagulant dosages and determine the conditions required to achieve optimum results.<br> Results: The results revealed that ferric chloride at an initial dose rate of 4 mg/L reduced nitrate concentration from 70 mg/L to less than the World Health Organization (WHO) guideline value (50 mg/L N-NO3). However, the removal efficiency of alum was not salient to significant nitrate reduction.<br> Conclusion: In conclusion, ferric chloride was more effective than alumin removing NO-3, even in common dosage range, and can be considered a cost-effective and worthy treatment option to remediate nitrate-polluted water. Furthermore, the removal of nitrate by coagulation can be simple and more economical than other treatment alternatives.</p> Nitrate, Water treatment, Coagulation, Alum, Ferric chloride 69 73 http://ehemj.com/browse.php?a_code=A-10-1-49&slc_lang=en&sid=1 Ali Ahmad Aghapour aaaghapor@gmail.com 10031947532846002441 10031947532846002441 No Environmental Health Engineering, Department of Environmental Health Engineering, School of Health, Urmia University of Medical Sciences, Urmia, Iran Sepideh Nemati nemati.sepid@gmail.com 10031947532846002442 10031947532846002442 No Environmental Health Engineering, Student Research Committee, School of Health, Urmia University of Medical Sciences, Urmia, Iran Amir Mohammadi amahammadi@gmail.com 10031947532846002443 10031947532846002443 Yes Environmental Health Engineering, Student Research Committee, School of Health, Urmia University of Medical Sciences, Urmia, Iran Heshmatollah Nourmoradi ilam_nourmoradi@yahoo.com 10031947532846002444 10031947532846002444 No Environmental Health Engineering, Department of Environmental Health Engineering, School of Health, Ilam University of Medical Sciences, Ilam, Iran Sima Karimzadeh sima.karimzade@yahoo.com 10031947532846002445 10031947532846002445 No Environmental Health Engineering, Student Research Committee, School of Health, Urmia University of Medical Sciences, Urmia, Iran