title: Intensification of degradation of methomyl (carbamate group pesticide) by using the combination of ultrasonic cavitation and process intensifying additives.
abstract: In the present work, the degradation of methomyl has been carried out by using the ultrasound cavitation (US) and its combination with H2O2, Fenton and photo-Fenton process. The study of effect of operating pH and ultrasound power density has indicated that maximum extent of degradation of 28.57% could be obtained at the optimal pH of 2.5 and power density of 0.155 W/mL. Application of US in combination with H2O2, Fenton and photo-Fenton process has further accelerated the rate of degradation of methomyl with complete degradation of methomyl in 27 min, 18 min and 9 min respectively. Mineralization study has proved that a combination of US and photo-Fenton process is the most effective process with maximum extent of mineralization of 78.8%. Comparison of energy efficiency and cost effectiveness of various processes has indicated that the electrical cost of 79892.34Rs./m(3) for ultrasonic degradation of methomyl has drastically reduced to 2277.00Rs./m(3), 1518.00Rs./m(3) and 807.58Rs./m(3) by using US in combination with H2O2, Fenton and photo-Fenton process respectively. The cost analysis has also indicated that the combination of US and photo-Fenton process is the most energy efficient and cost effective process.
authors.affiliation: Chemical Engineering Department, Bharati Vidyapeeth University College of Engineering, Pune 411043, India.
authors.forename: Sunita
authors.initials: S
authors.lastname: Raut-Jadhav
authors.affiliation: Chemical Engineering Department, Institute of Chemical Technology (ICT), Matunga, Mumbai 400019, India.
authors.forename: Dipak V
authors.initials: DV
authors.lastname: Pinjari
authors.affiliation: CSIR-National Chemical Laboratory, Pune 411008, India. Electronic address: dsaini2010@gmail.com.
authors.forename: Daulat R
authors.initials: DR
authors.lastname: Saini
authors.affiliation: Chemical Engineering Department, N.I.T. Warangal, Andhra Pradesh 506004, India. Electronic address: shirishsonawane09@gmail.com.
authors.forename: Shirish H
authors.initials: SH
authors.lastname: Sonawane
authors.affiliation: Chemical Engineering Department, Institute of Chemical Technology (ICT), Matunga, Mumbai 400019, India. Electronic address: dr.pandit@gmail.com.
authors.forename: Aniruddha B
authors.initials: AB
authors.lastname: Pandit
mesh_terms: D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008724:Methomyl / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*; D014465:Ultrasonics
chemical_list: D010575:Pesticides; D008724:Methomyl; D006861:Hydrogen Peroxide
keywords: Fenton; Hydrogen peroxide; Methomyl; Photo-Fenton; Synergistic coefficient; Ultrasound cavitation