Reverse osmosis equipment, one of the common equipment for sewage treatment, is used more and more widely. The equipment adopts advanced reverse osmosis membrane separation technology and is an important equipment to remove most of salt, bacteria, virus and other impurities in the raw water, Equipment water quality of the key processing links. How to ensure the better operation of reverse osmosis equipment? Here to take you to understand the reverse osmosis equipment failure and analysis. The main work of reverse osmosis equipment is essentially the choice of permeability through the reverse osmosis membrane to complete the work of reverse osmosis equipment is the need to exert a certain pressure, the use of reverse osmosis membrane interception of the colloid completed. The following is part of the reverse osmosis equipment and how each link is completed, to help users understand the fundamentals of reverse osmosis equipment.
Composition of reverse osmosis equipment
1, pretreatment often consists of quartz sand filtration device, activated carbon filter device, precision filter device, the main purpose is to remove the sediment, rust, colloidal substances, suspended solids, pigments, odors, biochemical and organic matter, Ammonia value and pesticide contamination and other harmful substances. If the original water calcium and magnesium ion content is high, but also need to increase the water softener device, the main purpose is to protect the reverse-osmosis membrane from large particles of material damage, thereby extending the service life of reverse osmosis membrane.
2, the main reverse osmosis pump booster, membrane shell, reverse osmosis membranes, control circuits and other components of the entire water treatment system is the core part of the quality of water produced the most important also depends on the part. As long as the model of the membrane and the model of the booster pump are properly selected, the reverse osmosis host can achieve over 99% filtration of the salt in the water and the conductivity of the effluent can be guaranteed within 10us / cm (25 degrees).
3, the post-processing part of the main is made of reverse osmosis pure water for further processing, if follow-up process connected ion exchange or electrodeionization (EDI) equipment, you can obtain industrial ultrapure water, if it is used in Direct drinking water on the civilian process, then often followed by sterilization device, for example, can be attached to the outside germicidal lamp or ozone generator, so that the water can be consumed directly.
4, in order to ensure the normal operation of reverse osmosis systems and extend the life of reverse osmosis membrane components, when the reverse osmosis system is running for a period of time to remove calcium carbonate scale, metal oxide scale in water, biological growth (bacteria, fungi, molds, etc.) Other substances need to be cleaned of the system.
Reverse osmosis desalination equipment special washing method
1, air drainage and red water
In this technique, the components are filled alternately with water or cleaning liquid, and then the air and water are used to drain the water and fire cleaning liquid. The cleaning effect depends on the turbulent flow at the air / water interface. When using this technology, to prevent membrane dehydration. Such as the use of cleaning fluid perfusion, pH greater than 10 or less than 4 formula and toxicity of the larger formula, shall not use this technology.
2, reverse flow cleaning
Reverse cleaning is particularly effective on membrane assemblies contaminated with corrosion products and sludge because most of these contaminants are deposited on the feedwater side. The specific practice is to connect the cleaning liquid infusion tube to the RO section of the concentrated water outlet, the cleaning liquid drain pipe connected to the RO section inlet.
For silt-contaminated membrane modules, it is also effective to use an alternating positive wash and backwash. Each run time is about 30s ~ 3min. If frequent commutation, should be equipped with manifolds and valves to reduce leakage of fluid when commutated.
Reversible cleaning can also be used for RO membrane production of water washing, cleaning liquid pre-soaking, etc., in order to improve the cleaning effect. For the hollow fiber type RO module, because backflushing, the fiber squeezed to the water pipe, the flow of cleaning fluid is less than the positive wash, should note the flow, the pressure of the cleaning fluid should also be limited to 0.35MPa or less.
Reverse osmosis equipment cleaning management approach
1, low pressure washing
According to the maintenance regulations on the reverse osmosis equipment on a regular basis low-pressure washing is conducive to remove stains attached to the reverse osmosis membrane, to maintain the stability of membrane performance.
2, outage protection
For production reasons, reverse osmosis equipment often need to be out of service, which will affect the performance of reverse osmosis membranes, severe cases will result in loss of performance, can not be restored.
Short-term shutdown can be used when low-pressure flush to reduce the impact. It is noteworthy that the rinse water temperature should not be too low, otherwise it will affect the reverse osmosis membrane, resulting in deterioration of the membrane corruption. Long-term outage must be disinfectant cleaning and protection work.
3, chemical cleaning reverse osmosis membrane
Under normal conditions, reverse osmosis membrane attached to inorganic substances, microorganisms, metal oxides and other substances will reduce the handling capacity of reverse osmosis membranes, causing fatal losses. In order to maintain the permeability of the reverse osmosis membrane, desalination effect, the reverse osmosis membrane should be chemically cleaned.
Reverse osmosis equipment commonly used technology and scope
Reverse osmosis equipment is based on the principle of the opposite and infiltration made, the essence is to give a solution than the osmotic pressure to a large pressure, the solution of water through the semipermeable membrane separation process. It can remove harmful substances in water, such as bacteria.
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