Abstract:
d: 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/H2
O2
) 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 H2
O2
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/
H2
O2
, 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
H2
O2
, 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 H2
O2
, 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.
