The Difference Between Reverse Osmosis And Ultrafiltration

In the water purification market, reverse osmosis water purifiers and ultrafiltration water purifiers occupy an important position, and each has its unique advantages, which are welcomed by consumers.

The reverse osmosis water purifier is known for its high filtration accuracy, and the core is the RO reverse osmosis membrane with a filtration accuracy of up to 0.0001 micron. It can remove almost all impurities and harmful impurities in water, including heavy metals, bacteria, viruses, organic matter, etc., the produced water can be directly drinkable, and the effluent tastes good. In the space capsule, the water and even urine after the astronauts wash are treated by reverse osmosis technology before use, and its safety is beyond doubt. However, the reverse osmosis water purifier generally needs to be powered up and will discharge waste water, and the installation location must have a power supply and sewage outlet.

Ultrafiltration water purifier is a relatively primary water purification equipment, the core is ultrafiltration membrane, filtration accuracy of 0.01 microns. It can remove most of the turbidity, polysaccharide, suspended matter, colloids and other impurities, but the removal of minerals in the water is poor, the taste of the water is slightly poor, can not reduce the hardness of the water, and the boiling water container may scale. The advantage of ultrafiltration water purifier is that the flow rate is large, there is no waste water generation, no need to use electricity, environmental protection and practical, easy to install, simple operation and low maintenance cost.

Both reverse osmosis water purifiers and ultrafiltration water purifiers play an important role in water purification and meet the needs of different consumers. Consumers can choose their own water purifier according to their actual situation, such as water quality, budget, water demand, etc.

Ultrafiltration machine with ultrafiltration membrane as the core, filtration accuracy of 0.01 micron. It can remove rust, sediment, macromolecular organic matter, bacteria, viruses, residual chlorine, heterochromatic odor and other substances in water. However, ultrafilters are not effective at filtering viruses and heavy metals. For example, in some areas with poor water quality, the water may contain heavy metal ions such as lead and mercury, which cannot be completely removed by ultrafilters. Although the ultrafilter can retain some minerals in the water, it can pose a potential threat to human health because it cannot filter out heavy metals. In addition, the water filtered by the ultrafilter can not be drunk directly, if the water quality is hard at home, there will be scale generated after filtering with it.

2 Purification advantages of reverse osmosis machine

Reverse osmosis machine with reverse osmosis membrane as the core, filtration accuracy of 0.0001 micron. With such high filtration accuracy, only water molecules can pass through, and almost all bacteria, viruses and heavy metals in the water can be expelled. For example, reverse osmosis water purifiers can effectively remove heavy metal ions such as cadmium, chromium and lead from water, as well as bacteria such as E. coli and salmonella and various viruses. It can ensure the absolute safety of water quality, the output of water is almost pure water, can be directly drinkable. Initially, reverse osmosis technology was applied in the space field, and astronauts could convert any domestic wastewater into pure water to solve the problem of space water shortage. This fully demonstrates the powerful purification capacity of reverse osmosis water purifier. Whether in areas with a high risk of water pollution, or in homes with high water quality requirements, reverse osmosis water purifiers can provide people with safe and pure drinking water.

The ultrafilter does not need electricity to work properly, because it mainly relies on the water pressure of tap water for filtration. As long as the water pressure reaches 0.06Pa, the ultrafilter can operate normally. The minimum water pressure requirement of urban tap water is 0.3Pa, and under normal circumstances, the ultrafilter can work as long as it is connected to the tap water. This characteristic of the ultrafilter makes it more convenient in the process of use and is not limited by the power supply. Whether during a power outage or where there is no power supply, the ultrafilters continue to provide users with filtered water. Moreover, because there is no need for electricity, the ultrafilter does not generate additional electricity costs during operation, reducing the cost of use.

The reverse osmosis machine needs electricity to work properly. This is because the RO membrane aperture of the core component of the reverse osmosis machine is very small, only 0.0001 micron, and the tap water pressure cannot allow water molecules to pass through. In order to solve this problem, it is necessary to install a booster pump in front of the RO film, and apply pressure to the water supply through the booster pump, so that the water pressure reaches the working water pressure of the RO film. The use of the booster pump requires power, so the reverse osmosis water purifier needs to be powered.

Although the reverse osmosis machine needs electricity, its power consumption is not high. The power of the booster pump is relatively low, about 29 watts, and it takes about 20 hours to consume 1 kilowatt of electricity. This means that in the long-term use of reverse osmosis water purifiers, the electricity bill is relatively small. Moreover, the reverse osmosis water purifier consumes electricity only when it is making water, and it does not consume electricity when it is not working. Therefore, as long as people are often at home, there is no need to power off the reverse osmosis water purifier.

In actual use, the power requirements of the reverse osmosis machine also bring some convenience. For example, some high-end reverse osmosis water purifiers are equipped with an intelligent control system, which can remotely control the working state of the water purifier through a mobile phone APP to achieve functions such as timing switching and water quality monitoring. These intelligent functions provide users with a more convenient experience.

The ultrafiltration machine does not produce waste water in the purification work, because the ultrafiltration membrane is mainly filtered by external pressure or internal pressure when working, and impurities such as bacteria, viruses, sand and so on are trapped on the surface or inside the membrane element to achieve the filtering effect. In order to filter impurities, the ultrafiltration membrane usually does not set a special sewage outlet (if there is a sewage outlet should also be closed), impurities will not be discharged with water production, so the ultrafiltration membrane in the working process is no waste water. Although there is no waste water at work, the impurities trapped by the membrane elements still need to be discharged, otherwise it will cause harm to the membrane performance. Usually in the process of physical cleaning and chemical cleaning, the impurities in the membrane element will be removed, and the water discharged during cleaning is actually the wastewater we often say. The characteristics of this non-waste water generation and relative water conservation of the ultrafilter are a great advantage for some users who pay attention to environmental protection and water conservation.

The reverse osmosis machine produces waste water during the purification process. This is mainly because the filtration accuracy of the reverse osmosis water purifier can reach 0.0001 micron, and to plug in, the pure water needs to be squeezed out of the filter membrane through high pressure, and the remaining waste water can only be discharged through the sewer. Different technical levels of reverse osmosis machine wastewater ratio is different, in the past reverse osmosis water purifier produced a lot of wastewater, there is a 1:3 ratio, purify a cup of clean water, to produce 3 cups of wastewater. However, with the introduction of technological improvements and relevant policies, the water efficiency grade of wastewater must not be less than 35%, so the proportion of wastewater that is more common in the market today is 1:1, which greatly reduces the amount of wastewater. For example, a typical family of five will pay 3-4 yuan more for water a month, but it can get purified water for one month. According to the calculation of 10 liters of water used by a family every day, 30 liters of waste water needs to be discharged every day, which is 30 * 30 = 900 liters = 0.9 tons in a month (according to the calculation of 2 yuan per ton of municipal tap water, 1.8 yuan of waste water is discharged in a month). Although reverse osmosis will produce waste water, it has the best purification effect and can meet the needs of family drinking water. For some areas with serious water pollution, reverse osmosis water purifier is necessary, although it will produce a certain amount of wastewater, but the effect is significant.

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The flow of the ultrafiltration machine is basically the same as the flow of tap water, because the ultrafiltration machine mainly relies on the pressure of tap water for filtration, and the filtration process is relatively simple and does not have obvious restrictions on the flow of water. In actual use, users do not need to worry about the size of the flow, whether it is daily washing vegetables, washing dishes, or bathing, laundry and other large flow water needs, ultrafilters can easily meet. For example, the average household tap water flow can reach a few liters or even a dozen liters per minute, and the flow of ultrafilters can also be maintained at this level. This makes the ultrafilter have a great advantage in meeting the various water needs of the home, especially for those users who have high water flow requirements, the ultrafilter is a good choice.

The reverse osmosis machine will greatly reduce the flow of water due to its fine filtration structure. The core component of the reverse osmosis machine is the RO membrane, the RO membrane has a very small aperture, only 0.0001 micron, and water molecules need to pass through the RO membrane under the action of the booster pump. Although this filtration method can ensure the high purity of the water quality, it also limits the flow of water. General household reverse osmosis machine flow is small, such as the common 50G reverse osmosis machine, through conversion, its flow is about 7.8L/H, equivalent to half a barrel of water. However, with the continuous progress of technology, there are also some large flow reverse osmosis machines on the market, such as 400G, 600G, 800G and so on. The larger the RO membrane, the greater the flow, these large flow reverse osmosis machines can improve the flow of water to a certain extent, to meet the needs of users for rapid water intake. However, relatively speaking, its price will be higher, and later maintenance costs will increase. For example, a 400G reverse osmosis machine can produce at least 1.05L of water per minute, and a good RO film can even reach about 1.6L per minute. The reason affecting the size of this flux value is related to the volume of the RO film, and the larger the volume, the larger the flux value. In general, the reverse osmosis machine has certain limitations relative to the ultrafiltration machine in terms of flow, but it has higher accuracy in water purification.

Ultrafiltration water purifier has the advantages of no electricity, no waste water generation, large flow rate, etc., suitable for the following scenarios:

Kitchen washing and cooking: The ultrafilter can effectively remove impurities such as rust, sand and macromolecular organic matter from the water to meet the daily water needs of the kitchen. When washing vegetables and dishes, large flow of water can quickly rinse ingredients and tableware, improving efficiency.

There is a need for mineral retention: ultrafilters are able to retain some minerals in the water during the filtration process, which is a good choice for those who want to obtain certain minerals from the water. For example, some people who pay attention to health care think that the minerals in water are good for the body, and the ultrafilter can meet their needs.

Budget or electricity sensitive: Ultrafilters do not use electricity, do not incur additional electricity expenses, and the price is relatively low, making them an affordable option for households with limited budgets or electricity sensitive.

Reverse osmosis water purifier has the advantages of high filtration accuracy, pure water quality and direct drinking, suitable for the following scenarios:

Direct drinking tea: The water produced by the reverse osmosis machine is almost pure water, which has a good taste and can be drunk directly. For people who like to drink tea and coffee, brewing drinks with water filtered by reverse osmosis machine can better reflect the flavor of drinks.

Poor water quality areas: In areas with a high risk of water pollution, reverse osmosis machines can effectively remove harmful substances such as bacteria, viruses, heavy metals in water, and provide people with safe and pure drinking water. For example, some areas with serious industrial pollution or old residential areas, water quality may have a big problem, reverse osmosis machine is the first choice to ensure family drinking water safety.

High water quality requirements: For some people with special needs, such as infants, the elderly, the sick, etc., they have higher requirements for water quality. The water filtered by the reverse osmosis machine has a high purity, which can meet the special needs of these people.

When choosing a water purifier, it should be considered according to the local water quality and personal preferences:

Choose according to the local water quality: If the local water quality is good, you can choose the ultrafilter water purifier, which can meet the daily water needs and retain some minerals in the water. If the local water quality is poor, containing more heavy metals, bacteria, viruses and other harmful substances, it is recommended to choose the reverse osmosis machine water purifier to ensure the safety of drinking water. For example, the water quality in the north is hard, the content of calcium and magnesium ions and scale is high, and the reverse osmosis water purifier can effectively remove scale and heavy metals; The water quality in the southern region is soft, but the impurities are more, the ultrafiltration machine and reverse osmosis machine can be considered, and the specific can be selected according to the individual’s requirements for water quality.

Choose according to personal preference: If you pay attention to retaining minerals in the water, and the water quality requirements are not particularly high, you can choose a ultrafilter water purifier. If you pursue high-quality drinking water and want to drink pure water directly, then reverse osmosis machine water purifier is a better choice. In addition, you can also consider the appearance, size, installation and other factors of the water purifier to choose a water purifier that is both practical and beautiful.

In short, the ultrafiltration machine and reverse osmosis machine water purifier has advantages and disadvantages, in the selection should be considered according to the actual situation, choose a water purifier suitable for their own family, to provide protection for the family’s healthy drinking water.