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Optimization of Uv-Electroproxone Procedure for Treatment of Landfill Leachate: The Study of Energy Consumption Publisher



Kermani M1, 2 ; Shahsavani A3, 4 ; Ghaderi P5 ; Kasaee P6 ; Mehralipour J7, 8
Authors
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Authors Affiliations
  1. 1. Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, University of Medical Sciences, Tehran, Iran
  3. 3. Environmental and Occupational Hazards Control Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  4. 4. Department of Environmental Health Engineering, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  5. 5. Master of Environment Engineering Water and Wastewater, West Tehran Branch Islamic Azad University, Tehran, Iran
  6. 6. Master of Civil Engineering, Azad University of Tehran West Branch, Tehran, Iran
  7. 7. Student Research Committee, Iran University of Medical Sciences, Tehran, Iran
  8. 8. Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran

Source: Journal of Environmental Health Science and Engineering Published:2021


Abstract

With increased population, treatment of solid waste landfill and its leachate is of major concern. Municipal landfill leachate shows variable, heterogeneous and incontrollable characteristics and contains wide range highly concentrated organic and inorganic compounds, in which hampers the application of a solo method in its treatment. Among different approaches, biological treatment can be used, however it is not effective enough to elimination all refractory organics, containing fulvic-like and humic-like substance. In this experimental study, the UV Electroperoxone process as a hybrid procedure has been employed to treat landfill leachate. The effect of various parameters such as pH, electrical current density, ozone concentration, and reaction time were optimized using central composite design (CCD). In the model fitting, the quadratic model with a P-Value less than 0.5 was suggested (< 0.0001). The R2, R2 adj, and R2 pre were determined equal to 0.98,0.96, and 0.91 respectively. Based on the software prediction, the process can remove 83% of initial COD, in the optimum condition of pH = 5.6, ozone concentration of 29.1 mg/l. min, the current density of 74.7 mA/cm2, and process time of 98.6 min. In the optimum condition, 55/33 mM H2O2 was generated through electrochemical mechanism. A combination of ozonation, photolysis and electrolysis mechanism in this hybrid process increases COD efficiency removal up 29 percent which is higher than the sum of separated mechanisms. Kinetic study also demonstrated that the UV-EPP process follows pseudo-first order kinetics (R2 = 0.99). Based on our results, the UV-EPP process can be informed as an operative technique for treatment of old landfills leachates. Graphical abstract: [Figure not available: see fulltext.] © 2021, The Author(s).
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