What are the working principles of reverse osmosis pure water equipment-Ocpuritech-img

What are the working principles of reverse osmosis pure water equipment?

by:Ocpuritech     2021-05-20
What are the working principles of reverse osmosis pure water equipment? Author: reverse osmosis water treatment equipment is mainly used for tap water and seawater desalination, water softening and treatment, many hospitals and purification plant, concentration and separation need to use this equipment. With the gradual and widespread application of reverse osmosis pure water equipment, many production and processing desalinated water treatment projects have achieved good results and are also loved by customers. So, do you know the working principle of pure reverse osmosis equipment? Let the environmental protection to introduce to you today.   reverse osmosis pure water equipment is composed of three parts: raw water pretreatment, reverse osmosis purification system, and ultra-purified post-treatment. The pretreatment is mainly to make the raw water after purification to meet the required standards, and then enter the purification system, so that the raw water after the initial purification will not cause damage to the subsequent equipment. The post-treatment system further removes impurities such as trace ions and organic matter in reverse osmosis pure water through integrated technology to meet the water demand of users.   Reverse osmosis is a separation technology powered by pressure difference, which is simple and efficient, with high separation and no change. The pores of the reverse osmosis membrane are as small as nanometers (1nmu003d10-9m). Under a certain pressure, the pure water in the raw water will penetrate in, leaving behind organic matter and impurities that need to be purified.   Usually when the conductivity of the raw water is less than 200μS/cm, the conductivity of the first-level RO pure water is ≤5μs/cm, which meets the third-level water standard in the laboratory. For areas with high raw water conductivity, in order to save the subsequent replacement cost of mixed-bed ion exchange resin and improve pure water quality, customers can consider choosing a secondary reverse osmosis purification system. The conductivity of secondary RO pure water is about 1~5μS/cm. The quality of raw water is related. The principle function of reverse osmosis: put the same volume of dilute solution (such as fresh water) and concentrated liquid (such as sea water or salt water) on both sides of a container, with a semi-permeable membrane in the middle, so that the solvent in the dilute solution will naturally penetrate Pass the semi-permeable membrane and flow to the concentrated solution side. The liquid level of the concentrated solution side will be higher than the liquid level of the dilute solution to a certain height, forming a pressure difference to reach a state of osmotic equilibrium. This pressure difference is the size of the osmotic pressure. Determined by the type of dope, concentration and temperature have nothing to do with the properties of the semipermeable membrane. If a pressure greater than the osmotic pressure is applied on the side of the concentrated solution, the solvent in the concentrated solution will flow to the dilute solution. The direction of this solvent flow is opposite to the original permeation direction. This process is called reverse osmosis. Reverse osmosis generally tap water or groundwater after the first-level reverse osmosis water treatment equipment, the conductivity of the produced water is less than 10μS/cm, after the second-level reverse osmosis water treatment equipment, the conductivity of the produced water is less than 5μS/cm or even lower. The water treatment equipment system is supplemented by ion exchange equipment or EDI equipment to prepare ultrapure water, so that the resistivity can reach 18 megaohms (conductivity u003d 1/resistivity). Reverse osmosis is the use of sufficient pressure to make the solvent in the solution (generally Often refers to water) through a reverse osmosis membrane (a semi-permeable membrane) to separate the opposite direction of permeation, the reverse osmosis method greater than the osmotic pressure can be used to separate, purify and concentrate the solution. The main separation object of the reverse osmosis membrane is the range of ions in the solution. Reverse osmosis is the most precise membrane liquid separation technology. The operating pressure is applied on the inlet water (concentrated solution) side to overcome the natural osmotic pressure. When the operating pressure higher than the natural osmotic pressure is applied to the concentrated solution side, water molecules naturally permeate the flow The direction will be reversed. The water molecules in the incoming water (concentrated solution) pass through the reverse osmosis membrane to become the purified water on the dilute solution side; the reverse osmosis equipment can block all soluble salts and organics with a molecular weight greater than 100, but allows water molecules Through, the reverse osmosis composite membrane desalination rate is generally greater than 98%, they are widely used in industrial pure water and electronic ultra-pure water preparation, drinking pure water production, boiler feed water and other processes, the use of reverse osmosis equipment before ion exchange can greatly reduce Discharge of water and waste water for bottom operation.
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