Effect of process intensifying parameters on the hydrodynamic cavitation based degradation of commercial pesticide (methomyl) in the aqueous solution |
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| Institution: | 1. Chemical Engineering Department, Vishwakarma Institute of Technology, Pune 411037, India;2. National Chemical Laboratory, Pune 411008, India;3. Chemical Engineering Department, N.I.T. Warangal, Andhra Pradesh 506004, India;4. Chemical Engineering Department, Institute of Chemical Technology (ICT), Matunga, Mumbai 400019, India;1. Department of Chemical Engineering, National Institute of Technology, Warangal 506004, Telangana State, India;2. Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai, MS, India;3. Chemical Engineering Department, Laxminarayan Institute of Technology, RTM Nagpur University, Nagpur 440033, MS, India;1. School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;2. Korea Environmental Industry and Technology, Seoul 03367, Republic of Korea;3. Department of Civil, Environmental and Environmental Engineering, Kumoh National Institute of Technology, Daehak-ro 61, Gumi, Gyeongbuk 730-701, Republic of Korea;1. Chemical Engineering Department, Bharati Vidyapeeth Deemed University College of Engineering, Pune 411043, India;2. Chemical Engineering Department, Institute of Chemical Technology, (ICT), Matunga, Mumbai 400019, India;3. National Chemical Laboratory, Pune 411008, India;4. Chemical Engineering Department, N. I. T Warangal, Andhra Pradesh 506004, India |
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| Abstract: | Methomyl, a carbamate pesticide, is classified as a pesticide of category-1 toxicity and hence shows harmful effects on both human and aquatic life. In the present work, the degradation of methomyl has been studied by using hydrodynamic cavitation reactor (HC) and its combination with intensifying agents such as H2O2, fenton reagent and ozone (hybrid processes). Initially, the optimization of operating parameters such pH and inlet pressure to the cavitating device (circular venturi) has been carried out for maximizing the efficacy of hydrodynamic cavitation. Further degradation study of methomyl by the application of hybrid processes was carried out at an optimal pH of 2.5 and the optimal inlet pressure of 5 bar. Significant synergetic effect has been observed in case of all the hybrid processes studied. Synergetic coefficient of 5.8, 13.41 and 47.6 has been obtained by combining hydrodynamic cavitation with H2O2, fenton process and ozone respectively. Efficacy of individual and hybrid processes has also been obtained in terms of energy efficiency and extent of mineralization. HC + Ozone process has proved to be the most effective process having highest synergetic coefficient, energy efficiency and the extent of mineralization. The study has also encompassed the identification of intermediate by-products generated during the degradation and has proposed the probable degradation pathway. It has been conclusively established that hydrodynamic cavitation in the presence of intensifying agents can effectively be used for complete degradation of methomyl. |
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| Keywords: | Hydrodynamic cavitation Venturi Advanced Oxidation Processes (AOPs) Synergetic coefficient Methomyl |
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