title: Degradation of imidacloprid containing wastewaters using ultrasound based treatment strategies.
abstract: The present work deals with application of sonochemical reactors for the treatment of imidacloprid containing wastewaters either individually or in combination with other advanced oxidation processes. Experiments have been performed using two different configurations of sonochemical reactors viz. ultrasonic horn (20 kHz frequency and rated power of 240 W) and ultrasonic bath equipped with radially vibrating horn (25 kHz frequency and 1 kW rated power). The work also investigates the effect of addition of process intensifying agents such as H2O2 and CuO, which can enhance the production of free radicals in the system. The combination studies with advanced oxidation process involve the advanced Fenton process and combination of ultrasound with UV based oxidation. The extent of degradation obtained using combination of US and H2O2 at optimum loading of H2O2 was found to be 92.7% whereas 96.5% degradation of imidacloprid was achieved using the combination of US and advanced Fenton process. The process involving the combination of US, UV and H2O2 was found to be the best treatment approach where complete degradation of imidacloprid was obtained with 79% TOC removal. It has been established that the use of cavitation in combination with different oxidation processes can be effectively used for the treatment of imidacloprid containing wastewater.
authors.affiliation: Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
authors.forename: Amar L
authors.initials: AL
authors.lastname: Patil
authors.affiliation: Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
authors.forename: Pankaj N
authors.initials: PN
authors.lastname: Patil
authors.affiliation: Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400019, India. Electronic address: pr.gogate@ictmumbai.edu.in.
authors.forename: Parag R
authors.initials: PR
authors.lastname: Gogate
mesh_terms: D003300:Copper / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry* / Q000528:radiation effects*; D007306:Insecticides / Q000737:chemistry* / Q000528:radiation effects*; D007501:Iron; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000737:chemistry* / Q000528:radiation effects*; D010573:Pesticide Residues / Q000737:chemistry / Q000528:radiation effects; D014160:Transducers, Pressure; D014465:Ultrasonics / Q000379:methods*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D003300:Copper; D006861:Hydrogen Peroxide; D007093:Imidazoles; D007306:Insecticides; D007501:Iron; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010573:Pesticide Residues; D062065:Wastewater; D014874:Water Pollutants, Chemical; C045076:Fenton's reagent; C082359:imidacloprid; C030973:cupric oxide
keywords: Combined approach; Hydrogen peroxide; Imidacloprid; Intensification; Pesticide treatment; Sonochemical reactors