Author/Authors :
Rezaee, A. tarbiat modares university - Medical Sciences Faculty - Department of Environmental Health, تهران, ايران , Godini, H. tarbiat modares university - Faculty of Medical Sciences - Environmental Health Department, تهران, ايران , Dehestani, S. tarbiat modares university - Medical Sciences Faculty - Department of Environmental Health, تهران, ايران , Khavanin, A. tarbiat modares university - School of Medical Sciences - Department of Environmental Health, تهران, ايران
Abstract :
In this study impregnated almond shell activated carbon by Zn degree and ZnS04 were used as adsorbent with aparticle size of 10-20 mesh. The objective of thi s research was to determine the ability of impregnatedactivated carbon in nitrate removal. Thle modified activated carbon had Imm effective size, with auniformity coefficient of 1.18. Potassium nitrate solution was used in batch adsorption experiments fornitrate removal from water. The effects of nitrate concentration, activated carbon dosage and time ofconta ct were studied. Experim ental data showed that modified acti vated carbon by Zn degree and ZnS04 wasmore effective than virgin almond activated carbon for nitrate removal. Th e maximum nitrate removalwas 64%-80% and 5%-42% for modified activated carbon and virgin acti vated carbon, respectively.While virgin acti vated carbon used, nitrate-N decreased from 20 to 15mg/L in 30min reaction . The finalnitrate concentration was not in the standard ran ge of WHO recommendations for water quality ; whileimpregnated activated carbons were used , niatedr creased to LOmgIL. Maximum removal was over 1617mgnitrate-N per Ig activated carbon for impregnated activated carbon . The experiments wereconducted at pH=6.2, 20°C and initi al concentrations of 20mg/L nitrate-No Incr ease in modifi ed activatedcarbon dosage increased the nitrate removal efficiency. The equ ilibrium time was found to be 45min formodified activated carbon.
