Fly ash – A cheap Catalyst in wet oxidation of an industrial pesticide effluent

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-bidi-theme-font:minor-bidi;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Fly ash, a solid waste from thermal power plants, has been used as a catalyst in reduction of COD of an industrial pesticide effluent by wet oxidation with H₂O₂at different temperatures. It has been found that 10% (w/v) fly ash loading enhanced the percent reduction of COD from 28.72 to 88.73 for a&nbsp; H₂O₂ loading of 4.5% at 335 K. The catalytic effect of fly ash remains unchanged even after fifth repeated use and more than 94% of the oxygen librated from&nbsp; H₂O₂is consumed for COD reduction. The spent fly ash exhibit good pozzolanic reaction, which suggests a potential route of utilization of spent materal.</span>