Supported liquid membrane extraction to treat coal gasification wastewater containing high concentra

The hollow fiber supported liquid membrane extraction was introduced to treat coal gasification wastewater to recover phenolic compounds,with tributyl phosphate (TBP) as carrier,kerosene as the membrane solvent,sodium hydroxide solution as the stripping agent and PVDF as the membrane material.Factors having strong impact on the extraction efficiency were studied in detail,including the mass transfer mode,twophase flow rate,stripping phase concentration.As extraction system with 20％ TBP-kerosene,parallel flow mass transfer,stripping phase concentration 0.1 mol/L,the optimal operating conditions could be obtained.Under the optimum operating conditions,the time required to reach equilibrium for the extraction is 50 min,and extraction efficiency of phenol is 86.2％ and the phenol concentration of effluent is 98.64 mg/L.