The Reverse Osmosis

Reverse osmosis (RO) is a liquid cleaning method in which atoms are separated from drinking water using a partially permeable membrane.

What Is Reverse Osmosis?

Due to the variety in solvent analytic potential, reverse osmosis uses applied pressure to defeat osmotic pressure, coordination features, and thermodynamic parameters.

Reverse osmosis can remove variously dissolved and suspended chemicals and organisms (mainly bacteria). Water can be used in industrial processes and drinking water production to retain dissolved substances on the membrane and the pressure side of the membrane. The pure solvent can reach the other side. The membrane should not “selectively” allow large molecules or ions to pass through the pores (pores), but should allow smaller solution components (such as solvent molecules, such as water, H2O) to pass freely. The solvent naturally moves across the membrane from an area of ​​low solute concentration (aerial liquid potential) to an area of ​​great solute mass (level liquid potential). One of the elements of the solvent is the reduction of free energy. Since there is no difference in the concentration of the solvent on both sides of the membrane in the system when the solvent becomes a more concentrated solution, it will decrease and the pressure will penetrate. Therefore, the natural flow of pure solvent is reverse osmosis. This process is similar to other membrane technology applications. The difference between reverse osmosis and filtration is that the mechanism of liquid flow is based on permeation through the membrane. The main removal mechanism of membrane filtration is to remove stress or size when the pore size is zero.01μm or higher, so theoretically the required processing efficiency can be achieved regardless of parameters such as pressure and solution concentration. The main mechanism of nanofiltration with a pore size of 0.001 µm to remove non-porous membranes or membranes is based on differences in solubility or diffusivity, and the process depends on pressure, solute concentration, and other conditions.

SUMMARY: Reverse osmosis is best known for purifying seawater from drinking water and removing salt and other wastewater from water molecules.

History Of Reverse Osmosis:

Jean-Antoine Nollet earliest recognized the diffusion methodology through a permeable layer in 1748. within the next two hundred years, penetration was simply a development discovered in the laboratory. In 1950, the University of California, la conducted the primary research. Use semi-permeable membranes for H2O desalination. in keeping with the National Water Company, researchers at the University of California, Los Angeles, and therefore the University of Sunshine State success extracted H2O from seawater in the mid-1950s, however before poet physiologist and Srinivasa Surirajan of the University of California, Los Angeles, they found this freshwater. . The resource case is bureau whose water flow is just too low to be commercially viable. The Ottawa analysis Council of British Columbia, a North American nation is learning a technique for making associate uneven membrane structure, that is characterized by the economical temptation of a skinny support layer on a thicker layer. And extremely porous membrane support. John Cadott of FilmTec Corporation determined that the chemical change of m-phenylenediamine and trimethyl chloride will form layers with Brobdingnagian and below seasoning fluxes. Cadott’s patent within the process was questioned and expired. By 2019, there’ll be 16,000 chemical action plants in the world, manufacturing about ninety-five million cubic meters of desalinated water for human consumption each day. regarding half this capability is within the geographic region and North Africa. In 1977, Cape Coral, Sunshine State became the primary community in us to use reverse diffusion on an oversized scale. The initial production capacity is eleven people, thirty-five million liters per day. In 1985, the town had the world’s largest unaggressive reverse osmosis system, which made 56.8 million liters throughout the day.

Clean Liquid Forms:

Clean Liquid Forms

Drinking Liquid Cleaning

Domestic drinking water treatment systems including the reverse osmosis stage are widely used worldwide to improve the quality of drinking water and cooking water. Such a system usually includes the following steps:

  1. Sediment filter used to trap particulate matter including calcium oxide and calcium carbonate.
  2. Optional second sediment filter with smaller pores.
  3. Activated carbon filter, used to capture organic chemicals and chlorine that degrade and degrade certain types of thin organic Membrane composite material membrane.
  4. Reverse osmosis filter, which is a membrane composite membrane.
  5. Optional, UV lamp used to sterilize bacteria that can leave the filtrate through the reverse osmosis membrane.
  6. Optional second carbon filter The filter used for trapping may not be present by removing the reverse osmosis membrane.

In some systems, the carbon filter without pre-cleaning and cellulose triacetate film CTA (cellulose triacetate) is a paper by-product film that is bonded to the synthetic layer and in contact with chlorine in the water. This requires adding a small amount of chlorine to the water source to prevent the formation of bacteria. For membranes, the CTA is 85-95%. If it is not protected by chlorinated water, the cellulose triacetate film is easy to disintegrate. , And thin-film composite membranes tend to rupture when exposed to chlorine gas. Thin-film composite membranes (TFC) are made of synthetic materials and require the removal of chlorine to allow water to penetrate the membrane. In all household reverse osmosis systems, TFC membrane elements and carbon filters formed due to the destruction of chlorine are used for pretreatment. Compared with CTA film, the waste rate of TFC film is higher, 95-98%, and the service life is longer.

Portable reverse osmosis water purifiers are sold everywhere for custom water purification. To work effectively, the water supply system of these devices must be under a certain pressure (usually 280 kPa (40 psi) or higher). Portable reverse osmosis water purifiers can be used for people in rural areas where clean water is not available outside of urban areas. Because the device is easy to use (a special membrane may be required for saltwater), villagers can filter water in rivers or oceans. Some travelers travel long distances on the island or in the country by boat, go fishing, or camp. /A regional reverse osmosis water purifier with a local water source is used together with one or more UV sterilizers.

When making bottled mineral water, the water passes through a reverse osmosis water purifier to remove pollutants and microorganisms. In European countries, this treatment of natural mineral water (according to the provisions of the European Directive, according to European law is not allowed). Some live bacteria can and must pass through the small defects of the RO membrane, or bypass the RO membrane completely by small leaks in the surrounding seals. Avoid microbial contamination.

The pore size of the membrane can vary from 0.1 to 5000 nm, depending on the filter type. Particle filtration removes particles 1 micron or larger. Microfiltration removes 50 nm particles, and ultrafiltration removes 3 nm or larger particles. Remove particles 1 nm or larger. Reverse osmosis belongs to the last category of membrane filtration (ultrafiltration), which can remove particles larger than 0.1 nm.

Decentralized use solar reverse osmosis-solar desalination system uses photovoltaic systems to produce drinking water from saltwater, which converts solar energy into energy for reverse osmosis. Solar reverse osmosis is very suitable for treating drinking water in remote areas without power grids, while solar energy exceeds the overall high operating costs and greenhouse gas emissions of infiltration systems. Conventional reverse osmosis makes them a compatible sustainable freshwater solution. For example, it has successfully tested solar desalination plants in remote communities in the Northern Territory of Australia. Although the intermittent nature of the sun and its changes in intensity throughout the day make it difficult to predict the efficiency of photovoltaic systems and the desalination effect under severe night weather, there are several solutions: for example, batteries can provide desalination sites during hours without sunlight. The required energy can be used to store solar energy throughout the day. In addition to using conventional batteries, there are other ways to store solar energy.

For instance, thermal power storage designs.

Military use reverse osmosis water purification system-reverse osmosis water purification system (ROWPU) is a portable stand-alone water purification system for military use. It can supply drinking water from almost any water source. Models of the armed forces of the United States and Canada. Some models are containers, some are trailers, and some are their vehicles. Each U.S. military unit has its own set of reverse osmosis water treatment systems, but they are all similar. The water is pumped from the original water source to the reverse osmosis water treatment module, then treated with a polymer in the water to induce condensation, and then passed through a multimedia filter, where it is initially purified by removing the haze. It is then pumped through a cartridge filter, which is usually spiral-wrapped cotton. This process removes any particles larger than 5 microns from the water and eliminates almost all urination. Then, the clarified water is pumped by a high-pressure piston pump to a series of water tanks where reverse osmosis is performed. The water in the product does not contain dissolved solids in the raw water, and the content is 90.00 to 99.98%. According to military standards, each kilowatt-hour of electricity should not exceed 1000 to 1500 ppm. The US Marine Corps uses a reverse osmosis water purification system. The lightweight water treatment system can be delivered by Humvees and can filter 470 liters per hour. The tactical water treatment system can be transported by truck to replace medium-sized tactical vehicles and can filter 4,500 to 5,700 liters per hour.

Water and Waste of Water Disinfection
After the rainwater extracted from rainwater is treated by a reverse osmosis water purifier, it can be used to irrigate gardens and provide industrial cooling for Los Angeles and other cities to solve the problem of water shortage. Distill the water several times. It should be as clean as possible so as not to leave deposits on the equipment and not cause corrosion. Deposits inside or outside the boiler tube will affect the performance of the boiler and reduce its efficiency. This will result in poor steam generation, resulting in a reduction in the power generation of the turbine. It is also used to treat sewage and brackish groundwater. A large amount of wastewater (more than 500 m3 per day) must be treated in the sewage treatment plant first, and then the clarified wastewater is sent to the reverse osmosis plant. The treatment cost is greatly reduced, and the service life of the reverse osmosis system membrane is prolonged. reverse osmosis can be used to make deionized water.

The reverse osmosis process used for water purification does not require any heat energy.

Food Manufacturing

In addition to desalination, reverse osmosis is a more economical method of concentrating food liquids (such as fruit juice) than traditional heat treatment processes. Check the concentration of orange juice and tomato juice. Its benefits include lower operating costs and the ability to avoid heat treatment processes, making it suitable for heat-sensitive substances present in most foods, such as proteins and enzymes. Reverse osmosis is widely used in the dairy industry to make whey protein powder. And attentive. When using whey, the whey (liquid remaining in cheese making) will be concentrated from 6% solids to 10-20% total solids before passing through reverse osmosis ultrafiltration. Various whey powders, including whey protein isolate. Also, the ultrafiltration permeate containing lactose is concentrated from 5% of the total solids to 18-22% of the total solids by reverse osmosis to reduce the cost of crystallizing and drying lactose powder. Although this process was previously avoided in the wine industry, it is now widely known and used. The reverse osmosis system was deployed in Bordeaux, France in 2002. Well-known users include many elite companies (Kramer), such as Chéteau Léoville-LasCases in Bordeaux.

Maple Sorghum Making
In 1946, some maple syrup manufacturers began to use reverse osmosis technology to remove water from the juice before it was converted into syrup. Using reverse osmosis technology can remove about 75-90% of the water from the juice, thereby reducing energy consumption and the impact of high temperature on the syrup. Microbial contamination and membrane degradation must be controlled.

Many proprietors of rock fishbowls use reverse osmosis methods to artificially stir seawater. Tap water may contain excessive amounts of chlorine, chloramines, copper, nitrates, nitrites, phosphates, silicates, or many other chemicals that are harmful to sensitive organisms in the reef environment. For example, nitrogen composites and phosphates can produce toxic algae lumps. If there are chlorine and chloramines in the water, carbon filtration is required before the membrane, because the conventional household membranes used by coral reef keepers cannot handle these compounds. In many tropical glasses of water, although much tropical fish can survive under suitable conditions and in pure tap water, reproduction is impossible. Therefore, many water storage tanks sell reverse osmosis water tanks.


Areas with little or no surface water or groundwater can be desalinated. Due to its relatively low energy consumption, reverse osmosis is becoming an increasingly popular desalination method. In recent years, with the development of more efficient energy recovery equipment and better membrane materials, energy consumption has been reduced to 3 kWh/m3. According to data from the International Desalination Association, by 2011, reverse osmosis technology has been used for 66% of the installed desalination capacity (0.0445 is 0. 0674 km3/day), and reverse osmosis technology has been used in almost all newly installed installations. The factory mainly uses thermal distillation methods: multi-stage and multi-stage flash evaporation. Since the early 1970s, the desalination of seawater through reverse osmosis (SWRO) (a membrane process) has been put into commercial use. Sidney Loeb of the University of California, Los Angeles, and Srinivasa Surirajan of the California National Research Council proved its first practical application. Because there is no heating or phase change, compared with other desalination processes, the energy demand is lower, about 3 kWh/m3, but it is still much higher than other forms of water supply (including reverse osmosis wastewater treatment), which is 0.From 1 to 1 kWh/m3. Although the reduced amount of recycling can reduce membrane pollution and energy consumption, up to 50% of incoming seawater can be recycled as freshwater. Reverse osmosis for saline water is usually used to desalinate water with lower salinity than seawater, usually from estuaries or salt wells. This process is almost the same as reverse osmosis of seawater, but the required pressure is smaller, so the required energy is also smaller. According to the salt content of the feed water, up to 80% of the feed water can be recovered as freshwater. Ashkelon’s reverse osmosis desalination plant is the largest in the world. The project was developed by a consortium of three international companies: Veolia Water, IDE Technologies, and Elran.

A typical reverse osmosis system with seawater channels includes:
1: water inlet
2: pretreatment
3: high-pressure pump (if not used in combination with energy recovery) 4: membrane module
5: energy recovery (if used)
6: remineralization and pH Adjustment
7: Disinfection
8: Operation -/Alarm Center

High-Pressure Pump
Even if the diaphragm prevents salt from passing through the diaphragm, the high-pressure pump will provide the pressure required to push the water through the diaphragm. The typical pressure of saltwater is 1.6 to 2.6 MPa (225 to 376 psi). The range is 5.5 to 8 MPa (800 to 1180 psi). This requires a lot of energy. When using energy recovery, some of the work of the high-pressure pump is performed by the energy recovery device, thereby reducing the energy consumption in the system.

Membrane Module

The membrane module is composed of a pressure vessel with a membrane through which the inlet water can be pressed onto the membrane. The membrane must be strong enough to withstand any pressure applied to it. Reverse osmosis membranes have a variety of configurations, of which the two most common configurations are spiral and hollow fiber. Only a small portion of the physiological influent pumped into the membrane module passes through the membrane, thereby removing salt. The remaining “concentrated” stream is directed along the salt side of the membrane to remove the concentrated salt solution. The percentage of desalinated water produced relative to the original brine flow is called the “recovery rate”. This depends on the salinity of the feed water and system design parameters: small seawater systems are usually 20%, large seawater systems are 40-50%, and brackish water is 80-85%. The concentrate flow rate is usually only 3 bar / 50 psi. The pressure is greater than the supply pressure and therefore still carries most of the input energy of the high-pressure pump. The purity of desalinated water depends on the salinity of the feed water, the choice of the membrane, and the recovery rate. To obtain higher purity, a second channel can be added, which usually must be pumped again. Purity (expressed as total dissolved solids) in raw seawater is usually 100 to 400 ppm (parts per million or mg/L). It is generally considered the upper limit for drinking water, and the FDA sets bottled water to be at least 250 ppm.

Energy Recovery

Energy recovery can reduce energy consumption by 50% or more. Most of the input energy of the high-pressure pump can be recovered from the concentrate stream. Improving the efficiency of the energy recovery device has greatly reduced the energy demand for reverse osmosis desalination. According to the present invention, the following devices are used: 1: Turbine or the Pelton wheel: a hydraulic turbine driven by the concentrate, the concentrate flow is coupled to the gear shaft of the high-pressure pump to provide part of its power consumption. A positive displacement axial piston motor is also used. Used for turbines in small systems. 2: Turbocharger: a hydraulic turbine driven by a concentrated water flow, which is directly connected to a centrifugal pump and increases the output pressure of the high-pressure pump, thereby reducing the pressure required by the high-pressure pump, thereby reducing its input energy, similar to turbocharging Device. The design principle of the turbocharger of automobile engine 3: Pressure exchanger: Under pressure, direct contact or use the concentrated liquid flow through the piston to increase the pressure in the membrane feed section to the pressure of the concentrated liquid flow. Relative to the diaphragm supply pressure, this pressure is usually 3 bar / 50 psi. This reduces the required flow from the high-pressure pump by the amount corresponding to the concentrate flow (usually 60%), thereby reducing its energy input. They are usually used in large energy systems with lower energy consumption, with a capacity of 3 kWh/m3 or less. 4: Energy recovery pump-piston pump, where a pressurized stream of concentrated liquid is supplied to the side of each piston, thereby helping to control the supply flow through the membrane from the opposite side. They are the easiest energy recovery equipment to use and combine high-pressure pumps and energy recovery in a self-regulating unit. They are usually used in small power systems with low energy consumption. Electricity consumption does not exceed 3 kWh/m3. Liquid (water) can be ignored. Such a system can achieve 60 percent efficiency of the second law.

Remineralizing and Potential of Hydrogen Adjustment:

Normally by combining lime or alkaline soda to inhibit corrosion from the lining concrete surface, stabilize the desalinated water to protect downstream pipelines and storage facilities. Lime material is used to adjust the pH value in the range of 6.8 to 8.1 to meet the specifications of drinking water and is mainly used for effective disinfection and antiseptic effects. Although the process has proven to be expensive and inconvenient, remineralization may be required to replace the removed water minerals with desalination. When it should meet the mineral needs of humans and plants. In the past, the demand for minerals from freshwater was the same as before. For example, the water from the Israeli National Water Transportation Company usually contains 20 to 25 mg/L of dissolved magnesium, while the water from the Ashkelon plant does not contain magnesium. Symptoms occur in crops such as tomatoes, basil, and flowers, which must be treated with fertilizer. Israel’s current drinking water standards set the minimum calcium content at 20 mg/L. In the subsequent desalination treatment at the Ashkelon plant, sulfuric acid is used to dissolve calcite (limestone) to a calcium concentration of 40 to 46 mg/L. 45 to 60 mg/L in typical Israeli freshwater.


If you are looking for a water filter that can provide clean, delicious drinking water for your home or business, reverse osmosis filtration (RO) is one of the most popular and affordable water filtration methods. When water is forced to pass through the semi-permeable filter, the reverse osmosis filter will work. Penetration + Reverse + (RO)> RO + filter + & + membrane and search_return = all & Customfield filter type = RO + membrane “style =” border: 0px; fill: 0 pixels; color: RGB (0, 144, 212); background Color: RGB (255, 255, 255); Cursor: Pointer; Font family: Roboto; Font size: 18 pixels; Space: Normal; ">The film that leaves the pollutants is washed away, and clean drinking water is collected in In a collection.

Frequently Asked Questions:

Q1: Why is reverse osmosis liquid not good for yourself?
A: Because reverse osmosis liquid effects do not include sufficient minerals when used, it will also clean out minerals, which indicates that crystals from food and vitamins can be excreted into urination.

Q2: How does reverse osmosis work?
A: Reverse osmosis uses a high-pressure pump to increase the pressure on the salt side of the reverse osmosis and push water through the semi-permeable reverse osmosis membrane. Therefore, almost all (from 95% to 99%) of the dissolved salt remains behind the reverse osmosis membrane.

Q3: Is reverse osmosis water suitable for you?
A: There is almost no evidence that reverse osmosis water is harmful. If you have a balanced diet and do not have severe acid reflux or gastrointestinal ulcers, drinking reverse osmosis water will not affect your health.

Q4: What is the distinction between osmosis and reverse osmosis?
A: The main distinction between osmosis and reverse osmosis is that osmosis is the diffusion of water molecules with lower water potential in the semi-permeable membrane, and reverse osmosis is the diffusion of water molecules. Use a semi-permeable membrane to withstand the gradient potential.

Q5: What can not be removed by reverse osmosis?
A: Although reverse osmosis filters can reduce the number of various pollutants, such as dissolved salt, lead, mercury, calcium, iron, asbestos, and cysts, they cannot remove certain pesticides. Chemical substances (VOC) include ions and metals, such as chlorine and Ra.

Q6: What kind of water is best to drink?
A: If your direct water source (such as distilled water) is contaminated, then pure water is a good choice. Tap water is clean water in many countries and regions. Therefore, in most cases, you will drink clean water every time you fill the tank.

Q7: What is better than reverse osmosis or filtration?
A: The difference between reverse osmosis and carbon filtration is that high-quality reverse osmosis membranes can be used. Activated carbon filtration most effectively removes or reduces pollutants and pollutants such as chlorine and sludge. , Volatile organic compounds, unpleasant water taste, and smell.

Q8: Can I drink reverse osmosis water?
A: If water flows through the membrane during this process, the product at the other end is completely pure water without impurities. Yes, reverse osmosis water can be 100% drinkable.

Q9: Can reverse osmosis kill viruses?
A: The reverse osmosis system is very effective in killing bacteria (such as Campylobacter, Salmonella, Shigella, E. coli); the reverse osmosis system removes viruses (such as intestines, hepatitis A virus, norovirus, round virus) B.

Q10: Is reverse osmosis water better than bottled water?
A: The reverse osmosis system filters out 98.8% of impurities on average. )very effective. They exist in your water, man-made or natural. They spend a small portion of the cost of bottled water each year.

Q11: Can reverse osmosis water be dehydrated?
A: Reverse osmosis water usually does not moisturize the body well. The residue of the plastic film appeared to fall into the water and then onto the human body. For people who drink reverse osmosis water, this is an eternal discovery. Even if the rest of the water is very pure, it will add new poison to the body.