Experimental Study On Pretreatment High Concentration Of Phenolammonia Wastewater Basing On Emulsion Liquid Membrane

High strength ammonia phenol-containning wastewater is mainly produced inpetrochemical, coking and other industry, due to its large scale and complex components, it is one of the severer contamination. Phenol is a toxicant of prototype, ammonia is a contributing factor for water eutrophication, above all, their high concentrations will inhibit the microbial growth, so this waste water is difficult to deal with and its treatment cost is high.Emulsion liquid membrane is a new technology of efficiency, low-cost and no secondary pollution, in recent years was widely used in environmental protection.In this paper, emulsion liquid membrane pretreatment of the high concentration ammonia simulated wastewater was studied. Firstly the main components of liquid membrane system were determined, then seven main factors including the surfactant dosage, liquid paraffin dosage, membrane inward concentration, the ratio between the volume of oil phase and the sulfuric acid, emulsion-water ratio, the external phase pH value and reaction time were studied by single factors anlysis. Their effect on the stability of emulsion liquid membrane, ammonia and phenol removal efficiency were also analysed, according to orthogonal experiments results, the optimal operating conditions was determined.The most efficient removing phenol conditions were as follows, surfactant mass ratio was 3%, the inner membrane phase was NaOH solution with of 2%, paraffin mass ratio was 11%, the ratio between the volume of oil phase and the sulfuric acid 1:1, emulsion-water volume ratio was 1:7, pH value was 5 and the reaction time was 5 minutes;The most efficient removing ammonia nitrogen conditions were as follows: surfactant mass ratio was 3%, the inner membrane phase was H2SO4 solution with of 20% mass concentration, paraffin mass ratio was 7%, the ratio between the volume of oil phase and the sulfuric acid was in 1:1, emulsion-water ratio volume was 1:7, pH value was 12 and the reaction time was 5 minutes;on these conditions, the removing ammonia test was first carried out, the removing phenol experiment was followed, the simulated wastewater and landfill leachate was treated by emulsion liquid membrane technology respectively.The results indicated this technology was efficient and had reproducibility, simulated wastewater test results were as follows, the phenol removing rates was more than 93%, ammonia removing efficiency was also above 96%, the remaining phenol concentration was less than 70mg / L, the remaining ammonia concentration was less than 32mg / L .on the other hand, leachate treatment results were as follows, ammonia removing efficiency was also above 97.13%, the phenol removing rates was more than 95.98%, the minimum remaining phenol concentration was less than 3.9mg / L, the minimum remaining ammonia concentration was less than 55.19mg / L. these achieved the aim of experiment design(the aim were both ammonia and phenol remainning concentration would be less than 100mg/L), also this pretreatment would do good to subsequent biological treatment process.At last, by emulsion liquid membrane separation of material to introduce new pollution research and technical economic analysis, taking into account the benefits of recovery of ammonium sulfate, the waste tons of water treatment cost is about 0.65 yuan. The technology is no secondary pollution, with economic feasibility.