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The elimination of organic compounds in coffee processing effluent utilizing electrochemical oxidation (ECO) as well as a combination of electrochemical oxidation (ECO) and ultraviolet and hydrogen peroxide (UV/H2O2) was explored. Then, the percentage reduction of chemical oxygen demand (COD) was investigated. The effect of different experimental factors such as solution pH, sodium chloride (NaCl) concentration, calcium chloride (CaCl2) concentration, electric current, electrolysis duration, and hydrogen peroxide dosage on the percent removal efficiency of the hybrid electrochemical oxidation (ECO) with the ultraviolet and hydrogen peroxide (UV/H2O2) process has been investigated. The response surface methodology (RSM) based on central composite design (CCD) was used to organize the trial runs and optimize the results. The hybrid electrochemical oxidation (ECO) with the ultraviolet and hydrogen peroxide (UV/H2O2) process removed 99.61% of the chemical oxygen demand (COD) with a low power usage of 1.12 kWh/m3 compared to the other procedures, according to the experimental data analysis. These findings were obtained with a pH of 7, a current of 0.40 A, 1.5 g of CaCl2, and a total electrolysis period of 40 minutes. When it came to eliminating organic compounds from coffee manufacturing effluent, CaCl2 outperformed NaCl. Analysis of variance (ANOVA) with 95% confidence limits was used to examine the significance of independent variables and their interactions.

In recent years, hard research has been aimed to develop effective technology for the treatment of wastewater and industrial effluent containing organic/inorganic contaminants. Amongst several technologies, the advanced oxidation processes (AOPs) recently have played a major role in the treatment of wastewater. In this study, the treatment of institutional wastewater by solar-photo-Fenton (UV/Fe 2+ /H 2 O 2 ) process based on AOPs was examined in terms of % color, % turbidity, and % COD removal. The solar-UV/Fe 2+ /H 2 O 2 process has revealed a higher removal of color (91%), turbidity (90%), and COD (86%) than the other processes. The effect of various experimental parameters such as hydrogen peroxide (H 2 O 2 ) concentration (0.25 to 1.25 g/L) and Ferrous ion (Fe 2+ ) concentration (0.005 to 0.12 g/L), initial pH (2 to 10), reaction time (30 to 180 min) on the color, turbidity and COD removal has been studied to find out the optimum conditions leading to maximum removal efficiency of the solar UV/Fe 2+ /H 2 O 2 process. The best results of the solar UV/Fe 2+ /H 2 O 2 process of institutional wastewater treatment have been found using 0.75 g/L of H 2 O 2 , 0.045 g/L of Fe 2+ , pH of 4, after 120 min of reaction time. The present study revealed that the solar-UV/Fe 2+ /H 2 O 2 process in an AOPs was well efficient in the institutional wastewater treatment, accomplishing a higher pollutant removal rate. The solar-UV/Fe 2+ /H 2 O 2 process is an effective treatment technique for the removal of pollutants from institutional wastewater.

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