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Study on the EDI for Production of Ultra-pure Water

Author: WangBinBin
Tutor: ZhouZhiJun
School: Zhejiang University
Course: Biochemical Engineering
Keywords: Electrodeionization Water dissociation Hardness ions Film stacks Scaling
CLC: TQ085.41
Type: Master's thesis
Year: 2010
Downloads: 72
Quote: 0
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Abstract


Electrodeionization (Electrodeionization, EDI) technique is the electrodialysis and mixed bed ion exchange to combine to form a new type of separation process, with non-polluting, the continuous production of ultra-pure water advantages, has become the mainstream of the technology of the preparation of ultrapure water. The dissociation mechanism membrane reactor scaling problem is the core issue in the basic research and engineering applications of EDI. This article by examining film stack voltage, concentrated water flow, freshwater flow properties of ultra-pure water preparation process for EDI and hardness ion removal, mainly away from the situation and influencing factors analysis of the hydrolysis of the film stack discuss EDI, EDI membrane reactor run modes and operating conditions of the EDI membrane reactor fouling and prevent EDI membrane reactor fouling. Comprehensive analysis of the various factors by examining the current - voltage characteristic curve, the curve of the pH-current change in the concentration of water and fresh water, EDI membrane reactor under different conditions, draw a the experimental membrane heap hydrolysis from the basic law, at the same time get the with freshwater quality factors. Experimental results show that at a lower voltage, the surface of the cation membrane is first hydrolyzed from the surface of the anion membrane, causing a decline in the pH of the concentrated water and freshwater; membrane stack current continued to rise, and concentrated, freshwater pH increases, mainly The anion exchange membrane surface from the hydrolysis of the anion resin surface. Changes in freshwater flows from the little effect on the hydrolysis, freshwater flow is too large will make freshwater water quality deterioration; concentrated water flow increased inhibition of water dissociation occurred; raw water conductivity make water dissociation is less likely to occur, so that the deterioration of freshwater quality. Simultaneously to obtain the optimum operating voltage of the membrane reactor of the present experiment is 40-45V, the best water recovery of 80% -90%. Through the quality of hardness removal balance analysis, confirmed at a voltage higher than the the EDI film heap voltage operating mode has an important influence on the EDI process: low voltage, EDI in enhanced mass transfer mode, the resin retainer salt type; high, EDI run in electric regenerative mode, the resin bed through the electrical regeneration converted to H and OH type EDI equivalent to a continuous guide to the regenerated mixed bed ion exchange. At the same time, the basic characteristics of the two different running modes EDI process were analyzed and discussed. In this experiment the EDI film stack voltage at the boundaries of the two modes of operation is between 25-30V. On the basis of this study, the experimental device the film stack voltage above 35V freshwater resistivity up to 13MΩ · cm, the the hardness removal rate can reach 96%; study found that EDI run in enhanced mode of mass transfer, EDI The film stack prone scaling, the size of the raw water hardness and high CO2 content in the membrane heap prone to fouling.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical plant > Industrial water,water treatment > Water treatment > Water purification
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