Hydroquinone is a toxic and hazardous pollutant in the industrial wastewater. This pollutant is toxic for organisms, fish, plants, and humans. It’s removal from industrial wastewater and groundwater is a serious problem. The aim of this study was to investigate the feasibility of photo catalytic oxidation process (UV-Fe 2 O 3 ) for removal of hydroquinone from aqueous solutions. Oxidation process of hydroquinone was studied by adding Fe 2 O 3 nano particles in the form of suspension in a 2.5-liter volume glass batch reactor. The influence of variables such as the concentration of pollutants, ultraviolet light (UV-A) intensity that was supplied with 2 to 4 UV-A lamps fixed outside of the reactor, and the effect of iron oxide nano particles concentration, reaction time, and pH on the efficiency of photo catalytic oxidation process were studied. Biodegradability of the treated solution before and after the reaction was measured by BOD 5 , COD, and its ratio. Results showed that the highest removal efficiency of 63% yielded at pH of 9; the pollutant concentration of 40 mg/L; contact time of 60 min; the nano particle dose of 1 g/L; and light intensity of 16 w/m 2 was achieved. Reaction kinetics results show that this photo catalytic reaction was fitted by the second-order reaction mode. The photo catalytic oxidation process increased the biodegradability of hydroquinone, so that the ratios of BOD 5 /COD for the before and after of photo catalytic oxidation were 0.09 and 0.55, respectively. According to the results, the UV/Fe 2 O 3 process could be used as an effective method for detoxification of hydroquinone from aqueous solutions and to increase its biodegradability.
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Khanahmadi et al. (2018) studied this question.
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