Ultrafiltration equipment
Ultrafiltration (UF) is a membrane separation technique, relying on fluid pressure-driven and tangential flow filtration process, in accordance with molecular size to separate particles, with a pressure difference as the driving force, the flow of starting material liquid in the membrane surface, the raw material mixture solvents and small particles from the solution of the high-pressure feed fluid through a low pressure side of the membrane, dissolved substances and a small pore size than the membrane material will be able to permeate through a membrane permeable to fluid or liquid was filtered off and the lens is generally called overnight, can not be trapped by ultrafiltration through the membrane material, generally referred to as partially trapped concentrate, concentrate the filtrate remaining solution concentration increases, to purify the solution, separation and enrichment purposes.Ultrafiltration is a membrane separation device, but the membrane pore size is much smaller than the microporous membrane, belonging to the molecular level, it can filter out bacteria, viruses, colloid and small molecular weight particles. It is used at room temperature, filtered and reliable performance, high precision, without adding drug that is able to achieve separation, concentration, purification classification purposes. It has a simple structure, easy operation, small footprint, ease of expansion and adding components and so on.
Ultrafiltration technology can achieve a solution purification, separation and concentration of purpose, is an efficient, environmentally friendly, energy-efficient separation process. At a lower pressure as a driving force to achieve separation according to the molecular weight of the particle size. Ultrafiltration process is near at room temperature, low power consumption, no phase transition, in the areas of food processing, pharmaceutical industry, biotechnology and other unique application value.Size and processing power of the ultrafiltration process adapt to a wide range of equipment, compact structure, easy to integrate with other separation unit, to achieve automatic control. Fine oil field injection water treatment, food and beverage processing water, urban and rural water treatment. Surface water and well water for drinking. Advanced treatment of wastewater recycling, liquor, wine, wine, wine sterilization, turbidity, food, dairy in the enrichment process.
Typical process: dope - Tank - pressure pump - Ultrafilter - Hollow ultrafiltration equipment - tank - backwash tank - backwash pump
General conservation knowledge hollow fiber ultrafiltration membrane
Hollow fiber ultrafiltration membrane technology in the most widely used configuration. Because of the hollow fiber membrane production continuous, uniform film quality is easy, good films are generally free of defects, large membrane packing density components, large membrane area, thus volume than other configurations (pipe, plate, etc.) is small.
Hollow fiber ultrafiltration membrane, the quality of the merits, in addition to appearance, internal quality varies greatly. a. Under 0.1-0.2MPa inflation pressure, the hollow fiber membrane surface and no bubble leak, bubbles show film defects, poor retention performance bound. b. Under certain temperature and pressure, (0.1MPa, 25 ℃) water flux should be moderate, about 120-200L / m 2 / h, too easy to plug the film, the low low efficiency.
c. compressive strength of the hollow fiber membranes (inside and outside of the pressure difference) should be above 0.3MPa. To improve the water flux in order to reduce the thickness of the film, increasing the porosity, at the expense of strength of the film is undesirable. d. interception performance to determine through water pollution index (SDI) value to determine, in theory, when the turbidity of the water in general, the UF permeate SDI value should be zero, but limited sampling, testing equipment, and pollution of the environment, usually SDI value is less than 2, at least, the normal value should be 1.0 or less.
Hollow fiber ultrafiltration membrane of life, depending on the following aspects;
1．Quality ultrafiltration membrane, pressure, defect-free uniform pore size, the membrane surface is smooth and the like.
2．Correct process, especially for large equipment ultrafiltration device must have backwash, fast rinse, chemical wash and rinse and other pneumatic piping and automatic control systems. That two out of a simple pipeline system, although the minimum equipment costs, but seriously affect the life of the membrane.
3．Good operating condition parts, must be based on the raw water quality, setting conditions for operating conditions, such as the operating pressure, the proportion of concentrated water ultrafiltration water, backwash, fast rinse frequency, intensity, time, chemical rinse cycle, select drugs, as well as methods of operation .
Hollow fiber ultrafiltration membrane of normal conservation methods:
1．Raw water to kill bacteria and microbes using fungicides. Maintain an appropriate amount of chlorine;
2．Pre-filter to remove solid particles suspended body, at high colloid content, using flocculation pretreatment;
3．Timing backwash quick rinse, chemical wash regularly;
4．Dynamic filtration, emission condensed water, recycling ratio depending on the raw water quality may be;
5．Slow-down, to prevent shock.
Hollow fiber ultrafiltration membrane during continuous running, you must timed, regular cleaning of various methods.
Cleaning methods are currently used are the following:
Backpressure backwash method: to clean water, from the ultra-filtrate side to the front into the rinse, the positive and negative direction of the film due to the extent of the pressure varies, generally only low pressure backwash, backwash little strength, the effect not. You must select a higher compressive strength of the film, at higher pressures, larger flow backwash, the best results. Flushing time of 30 to 60 seconds.
Equal pressure water washing method: ultrafiltration water outlet valve closed, condensed water outlet valve fully open, the membrane surface velocity increases, the removal of soft material attached to the surface more effectively.
Chemical cleaning method: According to the type of film surface contaminants, with select the appropriate chemical dissolution, oxidation or other chemical reaction to achieve the purpose of the removal. Common chemicals must be selected according to the nature of the membrane material selection, such as acids, bases, oxidants, bactericides, surfactants and detergent enzyme and the like. A method identical with the normal process of ultrafiltration, self cleaning fluid into the liquid at the entrance, and ultra filtrate concentrated liquid cleaning fluid container full return after cycle emissions to water wash.
1、The guide is responsible for equipment installation and commissioning.
2、Providing demand-side equipment maintenance personnel training.
3、On the sale of equipment to provide one year warranty (except wearing consumable parts), lifetime maintenance.
4、For users to create computer management files, regular visits.
5、Establish customer satisfaction phone, ready to accept user advisory.
6、Distributed throughout the service personnel will immediately solve problems arising users. |
