Optimization of UV-Electroproxone procedure for treatment of landfill leachate: the study of energy consumption

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

Investigation of photocatalytic-proxone process performance in the degradation of toluene and ethyl benzene from polluted air

“…Conventional ozonation involves the reactions in (Eqs. [6][7][8][9][10][11][12][13][14]. Equation (22) describes the photolysis mechanism.…”

“…The use of advanced oxidation processes (AOPs) for BTEX removal is a promising approach based on radical generation 10 . One of subsets of AOPs, including the ozonation process (OP) and its derivatives 11 . The ozonation process for BTEX elimination at ambient temperature is favorable as compared to other techniques given energy saving 12 .…”

Response Surface Methodology (RSM)-Based Prediction and Optimization of the Fenton Process in Landfill Leachate Decolorization

“…Based on a previous report [13], pH, experimental time, the amount of Fe 2+ , and the H 2 O 2 :Fe 2+ ratio are significant to the outcome of oxidative leachate treatment. Optimization of the aforementioned parameters could be a solution to overcoming the weaknesses in the Fenton process.…”

Optimization of stabilized anaerobic landfill leachate treatment using ozonation with metallic compound using response surface methodology

“…Advanced oxidation process (AOP) records good performance in remediating landfill leachate, such as the Fenton method, UV-electroproxone (Kermani et al, 2021), catalytic ozonation with granular faujasite zeolite (AlGburi et al, 2021), combination of hydrogen peroxide with US system (US-H 2 O 2 ) and hybrid of persulfate with US system (US-PS) (Tripathy et al, 2019). Unlike adsorption, which is a phase-transfer process, AOP is regarded as a destructive process.…”