Application Of Coagulation-activated Carbon Adsorption In Advanced Oxidation On Removal Of Organic Matter From Ternary Lithium Electrode Material Wastewater

Since the beginning of the 21st century,the development and application of new energy materials have become a top priority,among which ternary lithium electrode materials have become the representatives of new energy materials,but the production and processing of ternary lithium electrode materials will produce a certain amount of high Salt organic wastewater.In this paper,the ternary lithium electrode material wastewater quality analysis found that the removal of COD_Crin wastewater is a big problem.Because the wastewater contains a large amount of salt and heavy metal ions,it is difficult to treat it with biochemical methods.In this paper,through the combination of physical and chemical technology,that is,coagulation,activated carbon adsorption,Fenton oxidation,potassium permanganate oxidation and other treatment technologies,the best combination technology for removing COD_Crin the ternary lithium electrode material processing wastewater is studied and applied to engineering practice.In the coagulation-activated carbon adsorption experiment,it is determined through the coagulation experiment that when the solution p H=8,the dosage of PAC is 1300mg/L,the dosage of PAM is 15 mg/L,and the precipitation time is 30 min,the removal effect of COD_Cris the best,and the COD_Crremoval rate is up to 32.56%;it is determined in the activated carbon adsorption experiment that when the activated carbon particle size is 30-40 mesh,the solution p H=4,the adsorption time is 1.5 h,the activated carbon dosage is 2.5 g/L,the removal effect of COD_Cris the best,and the COD_Crremoval rate is up to 60.56%.In the advanced oxidation experiment,the effects of Fenton oxidation and KMnO₄oxidation on the removal of COD_Crfrom the ternary lithium electrode material processing wastewater are studied.In the Fenton oxidation experiment,it is determined that when the solution p H=3,the COD_Cr/H₂O₂mass concentration ratio=1:1.5,COD_Cr/Fe²⁺mass concentration ratio=1:1.5,reaction time 3 h,the removal effect of COD_Cris the best,the average removal rate of COD_Crcan reach 40.88%;it is determined in the KMnO₄oxidation method unit experiment that when the solution p H=5,the dosage of KMnO₄is 500 mg/L,the reaction time is 3 h,the removal effect of COD_Cris the best,the average removal rate of COD_Crcan reach 24.93%.In the activated carbon synergistic advanced oxidation experiment,the effects of activated carbon synergistic Fenton oxidation and activated carbon synergistic KMnO₄oxidation on the removal of COD_Crfrom the ternary lithium electrode material processing wastewater are studied.In the activated carbon synergistic Fenton oxidation method experiment,it is determined that when the solution p H=3.5,activated carbon is added amount 1.5 g/L,COD_Cr/H₂O₂mass concentration ratio=1:1.5,COD_Cr/Fe²⁺mass concentration ratio=1:1.5,reaction time 1.5h,the removal effect of COD_Cris the best,the average removal rate of COD_Crcan reach 80.42%;Activated carbon and KMnO₄oxidation method experiments confirmed that when the solution p H=4,the dosage of activated carbon is 1.5 g/L,the dosage of KMnO₄is 250 mg/L,the reaction time is 2 h,the removal effect of COD_Cris the best,and the average removal rate of COD_Crcan reach 70.12%.In the actual engineering application,the final project uses coagulation precipitation+activated carbon adsorption and Fenton oxidation treatment process.The average removal rate of the final effluent COD_Crreaches more than 90%,and the effluent COD_Cris far less than 90 mg/L,which can can stably reach the class I of second period level of water pollution discharge limits of Guangdong province（DB44/26-2001）.