Removal of organophosphate pesticides from wastewater by supercritical carbon dioxide extraction.
Organophosphate pesticides including fenitrothion chlorpyrifos, diazinon, methamidophos, edifenphos, mevinphos, fenthion, and acephate present in agro-wastewater can be effectively removed by supercritical carbon dioxide (SC-CO2) extraction. Near quantitative removal of the pesticides from the aqueous solution can be achieved by SC-CO2 at 90 degrees C and 325 atm for 20 min of static extraction followed by 40 min of dynamic extraction. The extracted pesticides were collected in a small amount of Fenton's solution. The pesticides in Fenton's solution were degraded completely within an hour after the collection. A combination of SC-CO2 extraction and subsequent degradation by Fenton's reagent may provide an alternative water purification strategy for treating organophosphate pesticides in agro-wastewater.
Yu
Jya-Jyun
JJ
Department of Environmental Engineering and Science, Feng-Chia University, Taichung, Taiwan, ROC. jjyu@fcu.edu.tw
D000383:Agriculture; D002245:Carbon Dioxide / Q000737:chemistry*; D025924:Chromatography, Supercritical Fluid; D006861:Hydrogen Peroxide / Q000737:chemistry; D007306:Insecticides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D009943:Organophosphorus Compounds; D018508:Water Purification / Q000379:methods*
C045076:Fenton's reagent; D007306:Insecticides; D009943:Organophosphorus Compounds; D002245:Carbon Dioxide; D006861:Hydrogen Peroxide; D007501:Iron