Environmental Health Engineering and Management Journal

en Optimization and evaluation of the process variable’s effect on color and turbidity removal from coffee processing wastewater: Using a photoelectrochemical oxidation process عمومى General مقاله اصیل Original Article <div style="text-align: justify;">Background: Coffee is the foundation of Ethiopia’s economy, but the wastewater generated by coffee processing cannot be properly treated, therefore, causing various environmental problems. Methods: In this research, electrochemical oxidation(ECO) and photo electrochemical oxidation(PECO) are combined with UV and hydrogen peroxide (UV/H2O2) to reduce organic compounds in coffee processing effluent with color and turbidity effect. The effects of various experimental parameters such as hydrogen solubility (pH), sodium chloride and calcium chloride (NaCl and CaCl2) concentrations, current and electrolysis time, and H2O2 dose were investigated. Results: The results were investigated and analyzed using response surface methodology (RSM) and Microsoft Excel. The color (99.6%) and turbidity (99.4%) were removed by combining ECO with UV/H2O2, which produces high amounts of hydroxyl ions (OH-), oxidizes large amounts of contaminants, and increases efficiency. These results were obtained at pH 7, current of 0.40 AMP, and 1.5 g CaCl2 after 40 minutes of electrolysis. The operating factors were pH, electrolyte dosage, time, current and H2O2, which plays a major role in increasing the removal capacity of photoelectrochemical oxidation for coffee processing waste water treatment. CaCl2 was once more wonderful in the removal of organic compounds from coffee processing effluents. Conclusion: Therefore, the introduction of this ultraviolet light is a powerful oxidant with H2O2, which can improve pollution control. An analysis of variance (ANOVA) with a 95% confidence interval can be used to determine the magnitude of the independent variable.</div> Coffee, Wastewater, Water purification, Ethiopia 1 15 http://ehemj.com/browse.php?a_code=A-10-1-278&slc_lang=en&sid=1 Firomsa Bidira bidiraabdi84@gmail.com 100319475328460011757 100319475328460011757 No Faculty of Civil and Environmental Engineering, Jimma Institute of Technology, Jimma University P.O. Box 378, Ethiopia Zerihun Asmelash zerihunasmelash2009@gmail.com 100319475328460011758 100319475328460011758 No Faculty of Civil and Environmental Engineering, Jimma Institute of Technology, Jimma University P.O. Box 378, Ethiopia Seifu Kebede kebed2seif@gmail.com 100319475328460011759 100319475328460011759 No Faculty of Civil and Environmental Engineering, Jimma Institute of Technology, Jimma University P.O. Box 378, Ethiopia Abrham Bekele abreham.bekele@ju.edu.et 100319475328460011760 100319475328460011760 Yes Corresponding author: School of Chemical Engineering, Jimma Institute of Technology, Jimma University P.O. Box 378, Ethiopia