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Study On Separation Phenol From Phenolic Wastewater Through Supported Liquid Membrane

Posted on:2006-02-18Degree:MasterType:Thesis
Country:ChinaCandidate:J ChenFull Text:PDF
GTID:2121360152975399Subject:Environmental Engineering
Abstract/Summary:PDF Full Text Request
As far as we known, phenol and o-nitrophenol exist in environment commonly, come mainly from specilized chemical plant. So, the study on separating and recovering effectively phenolic compound from phenolic wastewater is important subject. Separation phenolic compound from phenolic wastewater through supported liquid membrane consisting of N, N'-di (1-methyl-pentyl) acetamide (N 503) in kerosene, supported on the microporous polypropylene film, have been studied in this paper. Under the basis of solvent extraction, the effects of pH of the feed solution phase, carrier concentration in the membrane phase, sodium hydroxide concentration in the strip solution phase, initial solute concentration in the feed solution phase, experiment temperature, ion strength in the water solution on transport of phenol and o-nitrophenol in the supported liquid membrane system have been discussed. The optimum experimental conditions and membrane formation have been obtained. From the perspective of interface chemistry and diffusion mass transfer, the transport kinetic equations of phenol and o-nitrophenol have been developed. Thicknesses of diffusion layer (m) and diffusion coefficients (m2/s) in the liquid membrane phase of phenol and o-nitrophenol through SLM have been evaluated respectively. Finally, simulated wastewater containing phenol is treated through supported liquid membrane system which been established by experiment. The conclusions are as follows:(1) The extracted species of phenol with N 503 in kerosene is C6H5OHN503.(2) The optimum conditions of transport phenol though supported liquid membrane system are: initial phenol concentration in the feed solution phase is co=1.06x10"3mol/L, pH=3.6, carrier N 503 concentration in the membrane phase is 0.50mol/L, sodium hydroxide concentration in the strip solution phase is 0.4mol/L, ion strength in the water solution 1=0.4, experiment temperature is 300K, the transport percentage is above 95%. The optimum conditions of transport o-nitrophenol though supported liquid membrane system are: initial o-nitrophenol concentration in the feed solutionphase is 7.19x10~-4mol/L pH=2.7, carrier concentration in the membrane phase is 0.36mol/L, sodium hydroxide concentration in the strip solution phase is 0.2mol/L, ion strength in the water solution 1=0.6, experiment temperature is 300K, the transport percentage attain to 93.83% at the highest.(3) The thickness of diffusion layer and diffusion coefficient in the liquid membrane phase of phenol are = 3.49x10-6m, d0=2.74xl0-10m2/s respectively. The thickness of diffusion layer and diffusion coefficient in the liquid membrane phase of o-nitrophenol are =3.22x10-6m, d0=6-42x10-10m2/s respectively. The transports kinetic equations of phenol and o-nitrophenol in this supported liquid membrane system have been developed. And the transport kinetic equation has been demonstrated to be comparable with the experimental data.(4) Simulated wastewater containing phenol (100mg/L) is treated through supported liquid membrane system which been established by experiment After reaction 120 min at a batch, the transport percentage of phenol attain to 94.85%. The transport percentage of phenol attain to above 90% at average of four times experiment. The treatment result is better.The separation of phenol and o-nitrophenol though supported liquid membrane has been studied systematically in the paper. The available experimental model has been developed, and the model parameters have been evaluated. It is valuable that provide data for treating practical industry wastewater and doing furthering theoretical research.
Keywords/Search Tags:phenol, nitrophenol, supported liquid membrane, N-503, separation, wastewater treatment
PDF Full Text Request
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