| Membrane Separation Technology is an independent subject, which belongs to high technology. The study of micro-filtration Membrane has been started from 20th century in overseas. Until 60 ages, following the cellulose acetate filtration film of primitive exploitation, a lot of new variety has been developed, such as polyester, agamid fiber, polyfluorte, traethylene and so on. Initial stage of 70's, commercial of micro filtration Membrane achieved in America at first, which provide an ideal filter Membrane for precision filtration. In the field of precision Technology, classic analysis and separate method has been gradually replaced of Membrane Separation Technology, Which become importance means of increased production's quality, improved study's methods, shorten produce's cycle and raised the efficiency. With the growing of precision filtration technology in industry and scientific research, Membrane Separation Technology will be getting faster development.At present the familiar Membrane Separation Technology : Micro filtration (MF),Ultra filtration (UF),Reverse Osmosis(PO),Electro dialysis(ED),Pervaparation(PV),Liquid Membrane(LM),etc.With the development of industry, a great deal of wastewater of living and industry entered into water. Those water sources, which people depend on, suffer into pollution. Membrane Separation Technology as a growth subject in the high technology, its potential application region was realized. At recent, Membrane Separation Technology has been wildly attention in the field of environmental protection application.JiLin province is an important foodstuff producing area. A lot of large foods processing factories were founded. A lot of protein wastewater comes into being during working. Protein is very important nutritious substance and a mainly factor of causing to COD's increase. If the wastewater enter into environment will bring severe environmental problem and immense waste.Aim at this issue, we adjust pH, which comes up to isoelectric point to make deposit Separation, and adopt hollow fiber ultra filtration apparatus respectively. In order to increase recovery ratio of protein, reduce emission of protein, decrease pollution load, and In the meantime obtain great economic effect.Reaction mechanism: The Organic High Polymer in isoelectric point, which positive and negative charge is equal, net charge is zero, molecule pellet exclude reaction, Solution isn't steady, very easy collide cooperation each other and that to deposit and separate out .By now solubility is the lowest.Ultra-filtration is driven by pressure. Mini-molecules in the solution pass through Membrane, but Macromolecules of the solute is hold back. Basic principle is sieving domino effect, its equipments are simple, operation convenience, separation in level of molecule, no change in potential economize energy sources.Experiment indicates: adjusting isoelectric point and ultra filtrating by ultra filtration apparatus of hollow fiber. Elimination ratio of COD of starch sugar and starch reach is above 90%.In addition, it will be meet the issue of membrane pollutes in the any of technical application. Membrane pollution considered to be a mainly obstacle in ultra filtration. Membrane polluted refers to dealing with the particle, colloid particle or solute heavy in the supplies. Owing to physical chemistry interaction or mechanical function with the membrane, which cause membrane aperture diminish or fill in to bank up, then making water penetrating obstruction of membrane increase, hindering dissolution and diffusion of the membrane, and causing irreversible change phenomenon of characteristic on membrane produce penetrating flow and separate. The broadly-defined polluted membrane is not merely including because irreversible absorption, pollution owing to jam and including because reversible strong difference which causing gel forming (reversible to pollute) of layer to polarize, The two forms cause membrane flux depleted during operation course together. Water washes aims to get rid of...
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