Ceramic Adsorption-gaseous Membrane Method For Treating Manganese And Ammonia Nitrogen In Electrolytic Manganese Wastewater Respectively

Electrolytic manganese industry is an industrial industry with a large amount of pollutants,and the electrolytic manganese wastewater generated by its production process is discharged into the surface water body,which will lead to serious pollution.In this study,the combined process of ceramic adsorption-gaseous membrane was used to explore the feasibility of the combined process for the treatment of manganese and ammonia nitrogen in electrolytic manganese wastewater,as well as the key influencing factors,and obtained the optimal process parameters.The effects of Si O₂ and Al₂O₃ dosage,pore forming agent dosage,ceramic sintering temperature,sodium lauryl sulfate（SDS）modified concentration,Na OH modified concentration,solution p H and shaker shaker speed on the adsorption of Mn²⁺were studied by ceramic adsorption method.The results showed that the prepared ceramic grains could adsorb Mn²⁺with a ratio of 70:30 in the ratio of Si O₂ and Al₂O₃,the addition amount of corn starch was 12%,the sintering temperature was 850°C,and the holding time was 90 min,and the maximum adsorption capacity of the ceramic grains was 3.07 mg/g.The maximum adsorption capacity of the modified ceramic particles at a shaker shaker speed of 180 r/min and 24 h oscillation at room temperature was 5.21 mg/g after a mass fraction of 4%SDS solution,which was 1.70 times higher than that of the original ceramic particles,and the maximum adsorption capacity of Na OH solution with a concentration of 4 mol/L at a shaker shaker speed of 180 r/min and oscillation at room temperature for 2 h was 9.27 mg/g.Compared with the original ceramic grain,it is 3.02 times higher,the p H value of the control solution is about 8,the shaker shaker speed is 180 r/min,the adsorption time is 12 h,and the maximum adsorption capacity of the ceramic grain is 9.88 mg/g.The Langmuir isothermal model and quasi-second-order kinetic model can better describe the adsorption process of ceramic particles,and the maximum adsorption capacity Qmax is 11.267 mg/g.The effects of electrolytic manganese wastewater by gaseous membrane deamination were studied on the effects of feed concentration,absorption concentration,feed liquid flow rate,absorption liquid flow rate,feed solution p H,absorbent solution p H,Na OH and Ca（OH）₂ alkali regulation on NH₄⁺removal rate.The results showed that the concentration of ammonia-containing liquid was 1500 mg/L,the initial p H value was controlled at about 11,and the flow rate was fixed at 1000 m L/min.The concentration of sulfuric acid in the absorption solution was about 1 mol/L,the initial p H was maintained at about 1-1.5,and the removal rate was the highest when the flow rate was fixed at 1000 m L/min.In the 81-day stability experiment,the final ammonia nitrogen removal rate was maintained above 99.5%,and the total mass transfer coefficient K was maintained between 6×10^-6～1×10^-5m/s,which had good operational stability.For the same concentration of ammonia-containing solution,when the relative molar ratio between alkali dosage and ammonia-containing solution is less than 0.4,the p H of Ca（OH）₂ is significantly higher than that of Na OH.When the relative molar ratio is greater than 0.4,the p H of Na OH gradually increases higher than Ca（OH）₂.The results show that under the optimal operating conditions,the removal rates of Mn²⁺and NH₄⁺by the ceramic granule-gaseous membrane method were 98.79%,99.26%,98.31%,99.83%,99.86%and 99.82%,respectively,and the remaining concentrations of Mn²⁺and NH₄⁺were lower than 1 mg/L and 15 mg/L（national emission standard）,respectively,and achieved good experimental results.