Study On Catalytic Ozone Oxidation Treatment Of Reverse Osmosis Concentrated Water

With the continuous development and development of China's industrial technology,the problem of water scarcity has become increasingly serious,and zero discharge of industrial wastewater and reuse of water have received more and more attention.Reverse osmosis technology can intercept the water to make pure water,and the corresponding reverse osmosis concentrated water is difficult to process due to the concentration of pollutants in the raw water,which greatly limits the further promotion and application of reverse osmosis technology.The reverse osmosis concentrated water has extremely high salt content and organic matter is difficult to degrade.The common process is difficult to handle.In this paper,the degradation of organic matter in reverse osmosis concentrated water is studied.The salt content in reverse osmosis concentrated water is extremely high.The small-scale experimental study on simulated reverse osmosis concentrated water is conducted to investigate the feasibility of catalytic ozone oxidation process in treating reverse osmosis concentrated water,and the simulation of catalytic ozone oxidation process under different salt types and concentrations is investigated.The effect of reverse osmosis concentrated water.Under acidic conditions,Cl^-and SO₄^2-promoted the degradation of potassium hydrogen phthalate by catalytic ozonation.At Cl^-:SO₄^2-=2:1,the COD removal rate was 98.2%,and the UV254 removal rate was 98.8 %.Taking the reverse osmosis concentrated water of a food factory as the research object,the catalysts for the efficient treatment of the actual reverse osmosis concentrated water were screened,and the Mn/Cu catalyst was used to analyze and optimize the reaction conditions,ozone concentration and catalyst conditions.The reaction time was 30 min,the ozone concentration was 80 mg/L,and the catalyst dosage was 400 g.The reverse osmosis concentrated water was treated by catalytic ozonation.The COD removal rate was 52.9% and the UV254 removal rate was 77%.By grading and characterizing the water quality before and after the reaction,the hydrophobic acid and hydrophobic neutrals in the reverse osmosis concentrated water were transformed into the hydrophilic substance during the reaction,the hydrophilicity of the effluent was improved,and the fluorescence characteristics of the organic matter in the raw water were weakened.Taking the reverse osmosis concentrated water of a coking plant in Tangshan as the research object,the removal effect of COD in the coked reverse osmosis concentrated water by Fenton process and catalytic ozone oxidation process was compared by pilot experiment.The Fenton process has a reaction residence time of 2 h,p H=3,[H2O2]=40 mmol/L,[Fe2+]=8 mmol/L,the influent water is 280-309 mg/L,and the COD removal rate is 72.1%⁷7.4%,the effluent COD is 68.2⁸3.6 mg/L,at which time the cost of the medicament is about 6.45 yuan/ton of water?excluding labor and sludge treatment fees?.The catalytic ozone oxidation process has a contact reaction time of 2.5 h and an ozone concentration of 100 mg/L.The influent COD is 280 mg/L to 309 mg/L,the COD removal rate is 74.1%-79.2%,and the effluent COD is 61⁷4 mg/L,the cost of electricity at this time is about 2.45 yuan/ton of water.Compared with the Fenton reagent oxidation method,the catalytic ozone oxidation method has the advantages of simple and high efficiency,no need to adjust p H,and does not cause secondary pollution,and has advantages in deep treatment of coking wastewater.On the basis of the pilot test,preliminary engineering design and economic analysis were carried out on the actual project.The designed treatment capacity was 1500 t3/d,the total investment of the project was 2002.31 million yuan,and the treatment cost per ton of water was 4.74 yuan.