Studies In Wastewater Treatment With Reference To Advanced Oxidation Processes

Abstract

In this research work, the degradation of two pesticide pollutants (acetamiprid and newlinethiamethoxam) and pesticide industry effluent have been carried out by using cavitation newlinebased techniques and its combination with intensifying additives. Initially, the newlinedegradation of acetamiprid has been carried out by using ultrasonic cavitation (US) and newlineits combination with intensifying additives such as hydrogen peroxide, Fenton s reagent newlineand photo-Fenton process. The degradation of acetamiprid has also been carried out by newlineusing hydrodynamic cavitation (HC) and its combination with intensifying additives. The newlinegeometric optimization of three different cavitating devices viz. slit venturi, circular newlineventuri and orifice plate have also been carried out using HC and HC based combined newlineprocesses for the degradation of acetamiprid. The degradation of second pesticide newlinepollutant thiamethoxam has been carried out using individual US, HC and its newlinecombination with intensifying additives. Intensification of degradation of thiamethoxam newlineby the application of hydrodynamic cavitation based combined strategies has been newlinecarried using orifice plate, circular and slit venturi. Finally, the treatment of actual newlinepesticide industry effluent has been carried out by individual HC and its combination newlinewith H2O2 using slit venturi as a cavitating device. newlineIn case of ultrasonic degradation of acetamiprid, the degradation of acetamiprid has newlinebeen studied using ultrasonic cavitation (US) and its combination with H2O2, Fenton s newlinereagents and photo-Fenton process. Initially, the optimization of operational parameters newlinehas been carried out to enhance the performance of US under optimized conditions and newlinethe maximum degradation rate of acetamiprid was obtained at power density of 0.22 newlineW/mL, operating pH of 2.5 and acetamiprid concentration of 10 ppm.