Research on Catalytic Oxidation Pretreatment of Organic Pesticide Wastewater with High Concentration

Pesticide wastewater has the characteristics of high organic pollutant, high concentration, deep color and high toxicity, which has become difficult to treat the organic wastewater with high concentration at home and abroad. This article uses three methods of US(ultrasonic), Fenton(Fe&H2O2) and combination of US&Fenton were used in the comparative research on the treatment of organic pesticide wastewater with high concentration. Experimental conditions: time of 130 min, ultrasonic power of 280W, frequency of 418kHz, pH value of 3.5, H2O2 concentration of 0.3mol/l; dosing mode: two thirds was added at 0 min, the rest one third was added at 65 min. The results showed that the treatment effect of the combination of US&Fenton was significantly better than that of independent US and independent Fenton; after the treatment on the organic pesticide wastewater with high concentration, the degradation rate of COD reached 85%, the chromaticity degradation rate reached 99%; the ratio of COD/BOD was about 1.4, with better biodegradability, which has provided a good condition for the subsequent biochemical treatment. Solved the problem of pesticide wastewater was difficult and expensive to degradation.