Experimental Study On Treatment Of Dye Wastewater By Honeycomb Cinder

Our social and economic development today,the increasingly serious problem of environmental pollution.Dye wastewater treatment is an important problem facing water pollution control.Therefore,the development of a economy and efficiency dye wastewater treatment technology,for the protection of water environment,promote the sustainable development of the dye industry,is of great significance.Honeycomb cinder is a common solid waste,a lot of piling up will cause harm to the environment.However,the honeycomb cinder has a certain pore structure,and its use as adsorbents or catalyst carrier for the treatment of dye wastewater is promising.Advanced oxidation processes is a new wastewater treatment technology,in dealing with high concentration and refractory wastewater can achieve very good results,used to deal with dye wastewater is very appropriate.In this paper,azo dye wastewater was used as the treatment target,and methylene blue dye was used as the simulation object.The methylene blue simulated wastewater was studied by using adsorption,wet catalytic oxidation and advanced persulfate oxidation technology using honeycomb cinder as raw material.In this paper,the following three aspects are studied:(1)the honeycomb cinder is modified with a variety of reagents,and the honeycomb cinder before and after modification is characterized by a variety of instruments and equipment.The isothermal curves of adsorption of methylene blue on honeycomb cinder before and after modification were studied;(2)using the modified honeycomb cinder as the carrier,using the impregnation method to prepare the wet catalytic oxidation catalyst,the preparation process of the catalyst was studied,the catalysts were characterized using a variety of instruments,the effects of reaction conditions on the catalytic activity of the catalysts and the wet catalytic oxidation kinetics of methylene blue were studied;(3)using the modified honeycomb cinder as the carrier,using the impregnation method to prepare persulfate advanced oxidation catalyst,the preparation process of the catalyst was studied,the catalysts were characterized using a variety of instruments,the effects of reaction conditions on the catalytic activity of the catalysts and the advanced persulfate oxidation kinetics of methylene blue were studied.Through the above experimental research and analysis,this paper obtained the following research results:(1)The results show that the modification effect of KOH is the best.The adsorption capacity increased from 2.256mg/g to 4.714mg/g,and the specific surface area of the honeycomb cinder increased,and the adsorption of the dye molecules showed the adsorptionof the single molecule.The modification condition of honeycomb cinder were: 40% KOH modified at room temperature for 10 h.(2)The wet catalytic catalyst was prepared using the modified honeycomb as a carrier,and the results showed that the catalyst was prepared under the conditions that the active ingredient was Ni,the concentration of immersion liquid was 0.2mol/L,the impregnation temperature was 35℃,the immersion time was 2h,the calcination temperature was 300℃and the calcination time was 2h,the methylene blue degradation experiment was carried out under the condition that the dosage of oxidant was 8ml/L,the dosage of catalyst was 12g/L,the reaction temperature was 30℃,the reaction time was 1h,the concentration of wastewater was 120mg/L and the pH value was 7.Rate of more than 85%.The degradation of methylene blue by wet catalytic oxidation was a first-order reaction by the degradation of 500mg/L methylene blue simulated wastewater.The Arrhenius fit equation was lnk=-4059(1/T)+7.62,the activation energy Ea=33.747kJ/mol.(3)The peroxide advanced oxidation catalyst was prepared using the modified honeycomb as a carrier,and the results showed that the catalyst was prepared under the conditions that the active ingredient was Mn,the concentration of immersion liquid was0.2mol/L,the impregnation temperature was 35℃,the immersion time was 2h,the calcination temperature was 400℃ and the calcination time was 2h,the methylene blue degradation experiment was carried out under the condition that the dosage of oxidant was 1.6mmol/L,the dosage of catalyst was 8g/L,the reaction temperature was 25℃,the reaction time was 15 min,the concentration of wastewater was 1000mg/L and the pH value was 9.Rate of more than98%.The degradation of methylene blue by wet catalytic oxidation was a first-order reaction by the degradation of 2000mg/L methylene blue simulated wastewater.The Arrhenius fit equation was lnk=-1504(1/T)+ 1.2,the activation energy Ea=12.504kJ/mol.