The presence of phenolic compounds, such as phenol (carbolic acid or phenylic acid) and 2,4-DCP (2,4-dichlorophenol), in trace amounts in the agricultural environment and in chemical industries wastewater has been considered a potentially large risk for the environment and human health. Therefore, it is very important to develop effective techniques for removing phenolic compounds in wastewater. This research was conducted specifically to observe the effect of temperature of ozone production in the ozonation process to remove phenol and 2,4-DCP in the agricultural aquatic environment and industrial wastewater. This experimental study was conducted using a semi-continuous multi-injection bubble column reactor with initial concentrations of phenol and 2,4-DCP 50 ppm for 60 minutes ozonation. The effect of parameters namely, waste water flow rate, air flow rate, pH of the solution, and temperature were evaluated and optimized. Degradation efficiency, COD concentration, hydroxyl radical concentration were also monitored. It was found that the degradation efficiency at room temperature and low temperature (cold conditions) of phenol were 98.79% and 98.22%, respectively, while 2,4-DCP degradation at room and cold temperatures was 99.83% and 99, 99%, respectively.
Chlorophenols are a group of chemical substances given special attention by experts and researchers of industrial wastewater due to their high toxicity and low biodegradability. The degradation of these compounds, often used in studies is 2,4-Dichlorophenol (2,4-DCP), either use conventional processing methods or contemporary approaches such as catalytic ozonation and AOPs (Advanced Oxidation Processes). The laboratory-scale 2,4-DCP degradation technique in this study was carried out in a multiinjection bubble column, with very satisfactory processing results. This is mainly due to the ability of hydroxyl radicals to decompose almost all 2,4-DCP in wastewater as well as not giving out a dangerous product. Specifically, the chlorophenol waste used here is a synthetic wastewater or dilute 2,4-DCP solution focused on investigating the effect of air flow rate, wastewater flow rate, and the amount of iron oxide (FeO and / or Fe2O3) involved. This bench scale processing of 2,4-DCP degradation is a semi-continuous, with an initial concentration of 2,4-DCP of 50 ppm and 60 minutes of ozonation time. In this study, the use of FeO and/or Fe2O3 catalysts does not significantly affect the degradation efficiency of 2,4-DCP. With the non-catalytic ozonation technique, the highest percentage of phenolic and COD degradation obtained was 99.83% and 84.31% at an air flow rate of 12 L / min and a wastewater flow rate of 495 mL / min. For catalytic ozonation, the highest phenolic and COD degradation under the same operating conditions was 99.64% and 86.44%.
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