Catalytic ozone oxidation treatment of wastewater from a pesticide enterprise

Pesticide production wastewater has complex water quality, many types of pollutants, and large biological toxicity, and can cause a serious impact on the ecological environment when it is ineffectively treated. In this study, catalytic ozone oxidation was used to treat the actual production wastewater from a pesticide company, and the concept of ammonia nitrogen conversion rate was introduced to investigate the actual treatment performance of catalytic ozone oxidation on wastewater. The effects of ozone dosage, hydrogen peroxide dosage, catalyst dosage, reaction time, and reaction pH on chemical oxygen demand (COD) removal rate and ammonia nitrogen conversion rate in wastewater were analyzed. Results showed that the catalytic ozonation significantly reduced the chromaticity of wastewater, and the maximum COD removal and ammonia nitrogen conversion rates were 38.4% and 47.1%, respectively, at reaction pH 8, 3,000 mg/L ozone dosage, 3 mg/L hydrogen peroxide dosage, 50 g/L catalyst dosage, and 120 min reaction time.