Study On Modified And Granulated Goldmine Waste-solid In Treatment Of Dye Wastewater

With the development of dye industry, effluent of dye wastewater in China have reached157million tons every year. Typical characters of dye molecules in stable chemical structure and low biodegradability make them very difficult to disposal in wastewater treatment. According to generate highly reactive hydroxyl radicals to degrade organics, Advanced Oxidation Processes (AOPs) have the unique advantages of none selectivity and high oxidation efficiency.The goldmine waste-solid is the residue of ore after dressing or smelting. After being modified on the surface, it can not only improve the oxidation efficiency of active components with AOPs, but also realize the utilization of solid waste To treat with the dye wastewater with the surface.It fit the requirements of country which is green technology and energy saving and emission reduction process.Meanwhile, it overcome the disadvantage which is the catalyst Fe2+is easy to lose and it is difficult to operate continuously in normal Fenton reagent oxidation.The removal performance of typical disperse dye wastewater(CODcr=15400mg/L) and reactive dye wastewater(CODcr=58000mg/L) was firstly investigated by NaClO solution and homogeneous catalyzed Fenton reactions in this thesis.The research showed that:The CODcr removal are respectively10%and5%when5mL oxidant was added in100mL solution in oxidation processes with NaClO solution (mass concentration^0%)and normal Fenton reagent(Fe2+=3mmol, H2O2mass concentration=30%).It showed that the method of NaClO solution and normal Fenton reagent to treat with high concentration dye wastewater are low efficiency.To degrade organics from high concentration disperse dye wastewater with AOPs which employ H2O2as oxidant and use iron modified goldmine waste-solid as catalyst. The research showed that:The CODcr removal of1#(CODcr=38000mg/L) and5#(CODcr=15400mg/L) mother dye wastewater are respectively69.3%and62.1%,and the color removal are respectively87.5%and72.3%when4g modified goldmine waste-solid、5mL H2O2were added in100mL solution in iron modified goldmine waste-solid assisted AOPs. The CODcr removal of5#dye wastewater is still reached40.3%when the modified goldmine waste-solid was regenerated4times.The second part of this thesis is to research the granulation of goldmine waste-solid which use the goldmine waste-solid as main raw material,bentonite as adhesive, pulverized coal as excitant and porogenic diluents, ferrous sulfate as additives. The best condition of granulation:slag/bentonite=4:1, pulverized coal and ferrous sulfate are respectively occupied5%and0.2%of the mass of slag ang bentonite. Burning condition:Heating up to350℃in0.5hour and keep warm0.5hour, then go on heating up to900℃in0.5hour and keep warm2hour.The removal performance of4#(CODcr=13000mg/L) dye wastewater was researched by AOPs which employ H2O2as oxidant and use granulated goldmine waste-solid as catalyst. The results showed that:The CODcr removal of4#dye wastewater is reached70.2%,and the color removal is reached90%when4g granulated goldmine waste-solid%5mL H2O2were added in100mL pH5solution in granulated goldmine waste-solid assisted AOPs.The CODcr removal of4#dye wastewater is above44%and the color removal is above40%when the granulated goldmine waste-solid was regenerated4times.