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Phenol Removal from Coal Gasification Wastewater by Pervaporation

Author: KouXiangQuan
Tutor: YaoJie
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: Pervaporation Phenolic Wastewater Composite PDMS membrane Film mass transfer coefficient Boundary layer mass transfer coefficient
CLC: X703.1
Type: Master's thesis
Year: 2010
Downloads: 89
Quote: 2
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Abstract


Pervaporation is a new type of membrane separation technology in recent years one of the most active areas of research. Pervaporation is mainly used for the separation of a liquid mixture, suitable for the removal of a small amount of water or removal of volatile organic compounds from the aqueous solution from the organic solvent. Compared with the traditional separation techniques, pervaporation in organic wastewater contaminants removal has outstanding technical advantages of energy saving, and atmospheric pressure operation and good application prospects. The subject work PDMS composite membrane used in pervaporation processing coal gasification wastewater, waste water recycling process, the various operating conditions on pervaporation performance. Mainly on the initial concentration of coal gasification wastewater before and after pretreatment, the operating conditions of the system operating temperature, waste water into the liquid flow and membrane reactor pool inferior vena pressure affect the separation performance of the membrane, the optimum operating conditions. The study showed that with the increase of the concentration of wastewater initial permeate flux of the phenol in wastewater gradually increases, and a linear relationship at low concentrations. Pretreatment before the wastewater concentration is less than 2500mg / L, pretreated wastewater concentration of less than 3000mg / L, the permeate flux increases linearly with the initial concentration; phenol in wastewater permeate flux and the temperature dependence of the Arrhenius equation, permeate flux increases with temperature and monotonically increases; increase the flow of waste water into the liquid, intensifying the flow of the wastewater at the membrane surface, so that the permeate flux increases; lower chamber pressure membrane reaction pool is reduced, the wastewater permeating through a phenol of the film reduces the equilibrium concentration of the membrane lower side, the film on both sides of the phenol concentration difference increases, the mass transfer driving force increases, the permeate flux increases. The best operating conditions before and after the wastewater pretreatment on the experiment, pretreatment of wastewater before the initial concentration of 2500mg / L, the system is running a temperature of 50 ° C, into the liquid flow rate to 3.75 L / h, the reaction cell pressure inferior vena 800 Pa, the pervaporation performance optimal phenols wastewater permeate flux up to 20275mg / h · m2; pretreated wastewater suspended solids (SS) was significantly reduced, decreased from 350mg / L to 114mg / L . Wastewater initial concentration of 3000 mg / L, the system operating temperature is 50 ℃, the inlet flow to 4.50L / h the the reaction pool inferior vena pressure to 800 Pa, the optimal pervaporation performance, phenols wastewater infiltration through of up to 22700mg / h · m2. Constructed PDMS flat composite membrane pervaporation device pretreated coal gasification wastewater treatment, wastewater recycling process of mass transfer problems. Analysis of different flow state mass transfer in pervaporation process. The pervaporation process liquid mass transfer process Sherwood formula analysis, the liquid mass transfer coefficient, application series resistance model and experimental data combined to draw the membrane mass transfer coefficient. Identify experimental According to legend, from the film surface liquid transfer resistance and membrane diffusion mass transfer resistance of the pervaporation system plays a controlling role in the mass transfer resistance.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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