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Effect of Dissolved Oxygen/Nzvi/Persulfate Process on the Elimination of 4-Chlorophenol From Aqueous Solution: Modeling and Optimization Study Publisher



Baziar M1 ; Nabizadeh R1, 2 ; Mahvi AH1 ; Alimohammadi M1 ; Naddafi K1 ; Mesdaghinia A1 ; Aslani H3
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Center for Air Pollution Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Environmental Health Engineering, School of Public Health, Tabriz University of Medical Sciences, Tabriz, Iran

Source: Korean Journal of Chemical Engineering Published:2018


Abstract

4-Chlorophenol (4-CP) is a hazardous and toxic chemical that enters into water bodies mainly through industrial effluents. The present study investigated the effect of under pressure dissolved oxygen on 4-CP degradation in the presence of nanoscale zero-valent iron (nZVI) and sodium persulfate. The impact of oxygen pressure, as a qualitative variable at three levels (1, 1.5 and 2 atm), along with five quantitative variables, including persulfate concentration (0-2mM), nZVI dosage (0-1 g/L), pH (3-11), reaction time (5-90min) and 4-CP concentration (50-500mg/L) on the 4-CP elimination from aqueous solutions, was examined using response surface methodology. There was a direct relationship between the dissolved oxygen under pressure and the 4-CP removal efficiency. Also, the gained R2 and adjusted R2 for three developed models of 1, 1.5 and 2 atm oxygen pressure were 0.971 and 0.9569, 0.9689 and 0.9538, and 0.9642 and 0.9468, respectively. The best removal process conditions for pH 4.2, 1.6mM persulfate, 64.79 min reaction time, 97.89mg/L initial 4-CP and 1 g/L nZVI dosage. The results indicated that dissolved oxygen under pressure-nZVI-persulfate could be considered a promising process for elimination of organic compounds from aqueous solutions. © 2018, Korean Institute of Chemical Engineers, Seoul, Korea.