Treatment Of Organic Silicon Wastewater By Fluidized-BED Fenton Process

The compostion of organic silicone wastewater was complex and poor biodegradable. There were still a large number of non-biodegradable organic matters in wastewater after the traditional biological treatment, and need for further processing. The fluidized-bed Fenton process was applied in degradation of recalcitrant organic silicone wastewater, combined the the Fenton’s reagent low capital cost, easy operation and formation of non-toxic by-products, and increased utilization rate of Fe2+and H2O2with reduced production of ferric hydroxide waste sludge in the traditional Fenton process.The coated was baesd on three materials of quartz sand, broken bricks and granular activated carbon (GAC) and conducted characteristic comparison. Three carriers were successfully coated. Comprehensive analysised of the three carriers operating results and iron oxide composition, quartz sand was selected as the best carrier.The optimum operating parameters of fluidized-bed Fenton wastewater treatment was determined by single factor and orthogonal experiments. The iron oxide components such as FeOOH, FeO,Fe2O3, and Fe3O4were found on the coat of quartz sand using X-ray diffraction (XRD) analysis. The optimal operating conditions of organic silicon wastewater treatment were hydraulic retention time (HRT)60min, pH3.5, H2O2/COD (mass ratio)2.6:1, H2O2/Fe2+(molar ratio)13.6:1and quartz sand filling rate of35%. The treated effluent COD value was40mg/L and TOC value was20mg/L, with a removal rate of95%and85%, respectively.Compared to the traditional Fenton process, the effluent COD and TOC removal rate treated by fluidized-bed Fenton process were found to increase by20%and15%respectively at the same conditions. Furthermore, the total iron removal rate was also increased by five times, and greatly reduced the iron ion concentration in the liquid and effluent.