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Application of ultrafiltration technology in water treatment
作者:Steven 发布于:2011/5/13 14:20:54 点击量:

At the beginning of 90's of ultrafiltration technology in the production of mineral water has been widely used in recent years, the ultrafiltration technology in the preparation of pure water and reverse osmosis pretreatment and terminal treatment in ultra pure water system has gradually been recognized. But in the process of water treatment ultrafiltration how to play a role in the normal problems still exist.

When the membrane is in use, because of its high of water or solution bacteria, microorganism, colloid, suspended solids and soluble polymer retention effect, deposited on the membrane surface pollution, so the membrane permeability and rejection performance deterioration. In addition, bacteria, microbial attachment, its metabolites formed in the surface mucous membrane. All these factors will lead to decrease the performance of ultrafiltration membrane. Therefore, must according to the objective law of ultrafiltration operation, makes the ultrafiltration in the best working condition.

Optimization of membrane ultrafiltration membrane material is numerous, the choice of hollow fiber ultrafiltration membrane (Mao Xiguan), the main material for polysulfone (PS), polyacrylonitrile (PAN), polyethersulfone (PES), polyvinylidene fluoride (PVDF), etc.. In addition, polyamide, polysulfone because the preparation causes of price process and membrane materials, there is no production. Cellulose acetate was less restricted use of acid and alkali resistance. Polypropylene microporous membrane of hollow fiber to stretch induced hole in recent years, because of its low manufacturing cost, and served in the market of hollow fiber ultrafiltration membrane use, actually its long mesh pore size than UF 1 ~ 2 orders of magnitude, long hole deformation makes the bacteria, microbial leakage rate is more than 50% the colloidal particles, and the retention effect is poor.

Polysulfone with its unique chemical stability, high oxidation resistance, a wide range of pH values use (pH1 ~ 13), good heat resistance and other factors is preferred. But the PSF is hydrophobic membrane permeability, low, of certain substances adsorption performance, in water treatment has certain limitation. Solvent resistance, heat resistance, resistance to solar and atmospheric stability of polyacrylonitrile membrane, especially the film performance is good, on the preparation of uniform diameter of ultrafiltration membrane is extremely advantageous, with mild in some wastewater, ultrafiltration membrane in the field of foreign priority production, a larger proportion of. Application of our country in recent years in the large-scale use of pure water preparation has been successful. Water permeability, retention properties of film have reached a higher level.

Selection of cross section of the film structure of membrane micro structure with a single layer of finger pore structure and pore structure of two double cortex needle. When small substances through the single layer porous structure can be revealed, from the other side, not plug the pores caused by. While the double cortex needle hole structures such as small molecules can pass through the side of cortex, into the pore, there may be other side cortex interception and retained in the membrane formation plugging holes. But double cortex needle hole structure in favor of backwashing. In the selection of double skin needle hole structure of ultrafiltration membrane water flux in the meet at the same time should choose the cutting should be less than the entrapped molecules of solute molecules by about one order of magnitude. Used as mineral water and pure water pretreatment should select double cortex needle hole structure of capillary ultrafiltration membrane, molecular weight cut off in 1 ~ 20000, has good separation performance of bacteria, microbes, colloid, and is advantageous to the backwashing.

(source: http://wenku.baidu.com)

 

 

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