Sunlight-Assisted Photo-Fenton Process for Removal of Insecticide from Agricultural Wastewater
نویسندگان
چکیده
Pesticides and insecticides are harmful and toxic organic chemicals that are used for controlling pests and insects in agriculture, thereby considered as necessary evil. Agricultural wastewater, contaminated with such toxic pesticides, pollutes surface and groundwater. Pesticides are able to reach surface waters either directly or indirectly via the discharge of agricultural drainage water from treated land and via runoff after application on hard surfaces (Leu et al. 2004). Organophosphorus pesticides are produced in mass and are widely used in the developing country. 2,2 dichlorovinyl dimethyl phosphate, commonly referred as Dichlorvos (Fig. 2.1) is an organophosphorous insecticide, which is highly toxic, non-biodegradable and difficult to remove by conventional methods. During 2006–2010 period, consumption of Dichlorvos in India was 5833 metric tons. Due to its fairly good solubility [~10 g. L 1 (at 20 C)] in water (WHO 1978, 1994) it is highly mobile in aquatic environment. Various technologies and processes have been proposed for the treatment of pesticide-contaminated waters. Some conventional techniques including flocculation, filtration and adsorption of activated carbon are only based on a phase transfer of the pollutant. These treatment procedures are either of high cost or a source of secondary pollution due to sludge formation: therefore, there is a need to seek better alternatives (Evgenidou et al. 2005). Advanced oxidation processes (AOPs) are attractive methods for the treatment of wastewaters containing
منابع مشابه
Oil Refinery Wastewater Treatment by Advanced Oxidation Processes for Chemical Oxygen Demand Removal using the Box-Behnken Method
This study investigated the reduction of the chemical oxygen demand from the Kermanshah oil refinery wastewater using Fenton and Photo-Fenton processes. The study investigated the effects of operating variables such as ultraviolet light intensity in values of 0, 15, and 30 W, ferrous ion concentration in values of 10, 50, and 90 mg/l, hydrogen peroxide concentration in values of 100, 500 and, 9...
متن کاملبررسی کارایی فرایند فتوفنتون در حذف رنگ اسید سبز 20 از فاضلاب صنایع نساجی
Background and Objective: Acid dyes are synthetic organic compounds with complicated chemical structures which their treatment are difficult and costly. Discharchig of these dyes into the environmen causes harmful effects on ecosystem and water quality. In this study efficiency investigation of photo-fenton process in removal of acid green 20 dye from wastewater of textile industries was assess...
متن کاملInvestigation of Photo–Fenton–Like Process Efficiency in Diazinon Pesticide Removal from Aqueous Solutions
Diazinon pesticide and its metabolites have been identified in aquatic systems worldwide. It was related to toxicity for aquatic organisms, animals, and humans. Waters contaminated with such persistent insecticides should be treated with suitable treatment processes. In this research, Diazinon removal from aqueous solutions by the photo–Fenton–like process (UV/H2O2/Fe...
متن کاملDecolourisation of textile dyeing Wastewater by modified solar Photo-Fenton Oxidation
In a laboratory study, decolourisation of real textile dyeing wastewater by modified solar photo-Fenton (Steel scrap/ H2O2 ) process under irradiation with sunlight was examined. Batch experiments were conducted to determine optimal operating conditions .The optimal doses of H2O2 and steel scrap were 15 mL/L and 1 g/L, respectively at pH 3.Colour removal of 89% was obtained under optimum condit...
متن کاملFenton and solar photo-Fenton processes for the removal of chlorpyrifos insecticide in wastewater
The degradation of chlorpyrifos in water by Fenton (H2O2/Fe 2+) and solar photo-Fenton (H2O2/Fe 2+/solar light) processes was investigated. A laboratory-scale reactor was designed to evaluate and select the optimal oxidation condition. The degradation rate is strongly dependent on pH, temperature, H2O2 dosing rate, and initial concentrations of the insecticide and Fe 2+. The kinetics of organic...
متن کامل