Study On The Removal Of Copper From Wastewater By Liquid Membrane With LIX984N As Carrier

Among the industrial wastewater containing heavy metals,the quantity of copper-bearing wastewater is more than others,and it brings lots of damage to the environment.However,at present the methods of the treatment of Cu²⁺have some disadvantages.So it is important to find an efficient method for environmental protection.In this study,the extraction behavior of LIX984N for copper was studied with different extraction time,pH in the feed phase,carrier concentration in organic phase and H⁺ concentration in stripping phase. The extraction process is rapid.It is neglectable of the influence of pH in the feed phase on extraction when it more than 2.0.More LIX984N in the organic phase and H⁺ concentration in stripping phase are propitious to extraction and back-extraction.HFRLM experiments were performed in PVDF hollow-fiber modules,and carried out with a system as CuSO₄-LIX984N dissolved in kerosene- sulfuric acid.The results showed that the HFRLM process was very stable.Higher pH in the feed phase and more LIX984N in the organic phase are in favor of improving the transport performance of HFRLM process.The H⁺ concentration in stripping phase around 4.0 mol·L^-1is better for than others.There is a favorable O/A of 1:10 for the HFRLM process under the ranges studied.From the experimental data,the mass transfer coefficient of each phase was obtained,and the mass transfer model was suggested.It was verified that the model has a good agreement with experimental results.The series experiments showed that HFRLM is a promising method for removal and recovery of copper from aqueous solutions.Up-to 7th stage,the removal efficiency is up to 98.7%,the copper concentration in the outlet of feed phase is 0.9 mg·L^-1,which is lower than discharge standard of water pollutants for copper ions.The enrichment factor up to 25,and the "up-hill" effect.It is indicated that HFRLM is a promising method for removal and recovery of copper from aqueous solutions. Moreover,this study supplies the conclusions and experimental data for further investation and the industrial application of HFRLM technology.