Reverse osmosis water purifier principle

Reverse osmosis water purifier principle

Water purifier reverses osmosis working principle:
It uses mainly reverse osmosis membrane technology. Its working principle is to exert a certain pressure on the water so that water molecules and ionic mineral elements pass through the reverse osmosis membrane, and most of the inorganic salts (including heavy metals) dissolved in water, organic matter, bacteria, viruses, etc. are impenetrable. Passing through the reverse osmosis membrane, so that the permeated pure water and the impermeable concentrated water are strictly separated; the reverse osmosis is a driving force higher than the osmotic pressure, and the selective membrane can only pass through the water and cannot The process of separating water molecules from solute from a body of water through the selective permeability of the solute. The reverse osmosis water purifier is a machine that mainly uses the reverse osmosis principle for water treatment.

Water purifier reverse osmosis internal structure
PP cotton compressed activated carbon filter, activated carbon: 5-micron pore filter, remove residual silt, rust and other tiny impurities in the water; further remove residual chlorine, odor, and solid impurities in the water; can better improve the taste of water.
Reverse osmosis water purifier:
Pre-particle carbon filter: Multi-purpose essence, coal, shell (nuclear) and other carbonaceous materials are produced by chemical or physical activation. It has a very large number of micropores and specific surface area, so it has a strong adsorption capacity and can effectively adsorb organic pollutants in water. In addition, during the activation process, some non-crystalline sites on the surface of the activated carbon form oxygen-containing functional groups, which make the activated carbon have chemical adsorption and catalytic oxidation and reduction properties, and can effectively remove some metal ions in the water.
RO reverse osmosis membrane filter: the most effective removal of calcium, magnesium, bacteria, organic matter, inorganic matter, metal ions, and radioactive substances in water, the crystal clear and sweet and sweet alcohol purified by the device. The water filtered by the RO membrane does not contain substances harmful to the body, and the minerals beneficial to the body are preserved. The long-term consumption of the water purified by the RO filter does not cause side effects on the body.

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What is the difference between a reverse osmosis water purifier and an ultrafiltration machine?

What is the difference between a reverse osmosis water purifier and an ultrafiltration machine?

The difference:
First, the principle of purification
First of all, although both water purifiers can purify impurities in water, the purification principle is not the same. RO reverse osmosis water purifier is equipped with RO reverse osmosis membrane. Under the action of pressure, water can pass through RO membrane. Those inorganic salts, heavy metal ions, bacteria, viruses, and other impurities will be blocked by reverse osmosis membranes.
The ultrafiltration water purifier purifies the water source through its internal ultrafiltration membrane. Under the pressure difference, the water source can pass through the membrane and filter the impurities.

Second, purification accuracy
The two water purifiers with different purification methods have different purification precisions according to different principles. There is a layer of RO membrane inside the RO reverse osmosis water purifier. The pore size of this membrane is as small as a nanometer, while the size is as small as the virus and bacteria, and its volume is also a thousand times that of the RO membrane. The RO membrane is basically only water, does not contain other elements, and the filtered water can be boiled or boiled.
The ultrafiltration water purifier has an ultrafiltration membrane inside. The pore size of this filter membrane ranges from 0.01 to 0.001 μm, which is an order of magnitude larger than that of the RO reverse osmosis water purifier. At the same time, ultrafiltration membranes not only allow water to pass through but also allow small, small molecules to pass through, such as some mineral elements.
Third, the filter results
RO reverse osmosis water purifier separates water and concentrated water under a certain pressure, which makes the water purifier not only need electricity but also produces a certain proportion of wastewater.
The ultrafiltration water purifier relies entirely on water pressure for adjustment, eliminating the need to plug in the power supply.

The truth of the water purifier, don’t be fooled!

The truth of the water purifier, don’t be fooled!

If you really analyze the water purifier from the principle of environmental protection, you can write it from the waterworks to the end of the water purifier, but the article will become long and smelly, so simply ask everyone’s concerns and some of the industry. The tricky is simplified in the form of a question and answer.

What is the water purifier? How to classify?
A water purifier is a device that converts “not clean water” into “relatively clean water”, and the classification can be divided by its filtration level. The most commonly used on the market are ultrafiltration water purifiers and reverse osmosis water purifiers, in addition to water softeners.

Main use: Effectively filter out harmful substances such as sediment, rust, bacteria, colloids, macromolecular organic substances in water, and retain minerals and trace elements beneficial to the human body.

Advantages: Completely remove bacteria and algae including some viruses, and can safely drink where the metal ion content is low (although it is not recommended to drink directly).

Disadvantages: It is impossible to filter out calcium and magnesium ions and heavy metals, and there is also scale.

Usage: The filter cartridge is replaced regularly, and the replacement cycle of different filter cartridges is slightly different.

Main use: By using the ion exchange principle, the calcium and magnesium ions in the water are replaced by Na+ in the sodium salt in the machine. Thereby obtaining soft water.

Advantages: The water stains splashed by soft water are no longer obvious, the clothes are not easy to be stiff, the faint yellowing, the water heaters and other pipes are not easy to block, the bathing skin is not dry, and the shampoo is not dry and knotted and easy to comb. Generally, the water quality in the south is good and the north is poor. If the hard water tastes bitter, it is better to pack it.

Usage: Periodically replace the filter element (the salt inside), the replacement cycle of different filter elements is slightly different.

What is a reverse osmosis water purifier (RO machine)?

In general, the RO machine has five layers of filters.

Advantages: Currently the best products in the market.

Disadvantages: Waste water is produced, and a cup of pure water is produced with one or more “waste water”.

What is a pre-filter?


Main use: Installed behind the water meter to filter sediment, rust and large particulate matter in tap water, prevent a large amount of sediment impurities in the water net from causing harm to the human body, and pre-protect the water-using appliances.

Advantages: no special after-sales service, no need to replace the filter element, the filter effect is intuitive and transparent (the filter effect and use state can be clearly observed), and the service life is long (up to several decades).

Disadvantages: only coarse filtering.

Usage: After the tap water main road, observe the dirt deposition in the lower part regularly. When there is more dirt, open the lower valve and automatically flush out the dirt.

Is it necessary to install a pre-filter?

Generally, the water quality of the households is poor (with sediment, rust, and large particles). In the few months after the new home is in place, the water from the faucet is getting smaller and smaller. If you remove it, you can see such a situation. You can consider installing it. .

How to reserve a location?

Here is a relatively standard connection. If someone at home will change the water pipe (in fact, it is quite simple), you don’t have to reserve a backup waterway to deal with the emergency. If the water filter is removed, connect it with a stainless steel hose or braided tube.
When do you want to change the filter?

When the water consumption is too large, the filter element should be replaced in advance according to the water consumption. Signs when replacing the household water purifier filter

First, the water is too slow: the pre-filter or filter is clogged.
Second, the taste is not good: the service life of the rear activated carbon filter has arrived.

How to choose the water purifier that suits you?

If the water source has large particles such as sand, be sure to install a pre-filter to protect the waterway hardware and water appliances in the home. Xingge suggested that the general family can install, it is inevitable that one day the community water tank cleaning can still be a little protective, installed with a backwash function, can be used repeatedly, the service life can reach more than 10 years, the price is quite high, see When the color is dirty, clean it up and continue to use it.

If it is a heavy industry polluting city, choose RO water purifier to filter out heavy metal ion insurance.

If there is a lot of scale in boiling water (generally the water quality in the north is hard), or the pursuit of drinking water is relatively high, you can choose RO water purifier.

In areas with softer water quality (generally in the south), if you want to save money, you can use ultrafiltration.

Is the water in the waterworks really dirty?

Water plants use much better equipment than household water purifiers, and water plants in each region (for local unique pollutants such as heavy metals) will have different measures to deal with. The factory indicators also have national standard monitoring. (I didn’t contact the author, so I can’t reprint the original text. For details, please refer to the user: Lele Xiaoyi. Answer to the question “Our tap water is really dirty?”

Why is there a problem with the tap water coming out?

Generally, heavy metal pollution, pipe network pollution, secondary pollution, residual chlorine and other issues are the key to affecting users’ water use. Most of the reasons are in the water tanks for transportation and community living water!

The residual chlorine is so terrible, what if I don’t have the money to install the water purifier?

What you are afraid of is the carcinogen chloroform (chloroform), but it requires a high concentration of chlorine gas and special equipment to generate, and the reaction process can easily become carbon tetrachloride. The residual chlorine content of the water plant is 0.05~4mg/L. Do not have the conditions for the formation, and the low content after boiling is poor, don’t worry.

Call on those brainwashed dealers and salespeople to stop using their ridiculous reasons to market their water purifiers.

Do drinking regular water often make people lack minerals?

It does take away some of the minerals, but it is smaller than the daily food and mineral intake. You can rest assured that it is important to use pure water to wash the milk.

Is the pipeline machine useful?

The water coming out of the water purifier is clean enough. The pipeline machine is to ensure that there is no secondary pollution in the middle to directly boil water. The key to the purchase depends on the internal sealing degree.

But the bacteria floating in the air are more fragile, boiling the water, and these weak bacteria will die.

So buying or not buying is all right.

Does RO produce more wastewater? Will it be wasted?

First of all, these waste waters are not dirty water, washing clothes, washing the bathroom, taking a bath, etc., no problem at all.

Most of the “waste water” outlets of the RO machine are pressure drainage (even if there is no water in the clean water), my family will drain the drainage pipe to the water tank of the bathroom. The connection is as follows.

Which water purifiers need electricity?

General RO machines and water softeners need electricity.
The ultrafiltration machine can work with water pressure and does not need electricity.
Front water filter does not require electricity
In any case, a place where the water purifier is prepared (general kitchen sink) can be reserved for a socket.

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How to choose a water purifier

How to choose a water purifier

Is the weather in your home now blowing air conditioners or air conditioners?
Although the autumn has passed yesterday, it seems that the “cool autumn” seems to be far away~~~
In the hot summer, the best “beverage” is cool and white, but under high-temperature conditions, drinking water is undergoing subtle changes all the time, invisible, but there are health threats. Therefore, installing a water purifier at home is a guarantee for water safety.
The current water purifier industry has developed rapidly in recent years, and the water purifier branding market has gradually formed. The water purifier products are diversified and diverse. So how do you buy a water purifier?

Key point 1: According to the water quality of the area
The Ministry of Ecology and Environment notified the state of surface water environmental quality in December 2018.

The water quality is excellent (I to VIII), the proportion of the section is 74.2%, and the proportion of the inferior V section is 7.1%;
The proportions of the Yangtze River, the Yellow River, the Pearl River, the Songhua River, the Huaihe River, the Haihe River, the Liaohe River, the Zhuhe River in the northwest, the Zhuhe River in the northwest, the Zhuhe River in the southwest, and the Zhejing Plate in the southwest are excellent in water quality (I to VIII), which is 74.3%, up 2.5 percentage points year-on-year; The proportion of the V-type section was 6.9%, a decrease of 1.5 percentage points year-on-year. The main pollution indicators are chemical oxygen demand, ammonia nitrogen, and total phosphorus.
Among the 111 key lakes (libraries) monitored, the water quality was excellent (I~III), the lake bank accounted for 66.7%, up 4.2% year-on-year; the inferior V water quality accounted for 8.1%, down 2.6 percentage points year-on-year. The main pollution indicators are total phosphorus, chemical oxygen demand, and permanganate index.
– Ministry of Ecology and Environment

It can be seen that the water quality varies greatly from region to region, so the conditions for choosing a water purifier are also very different.
In some places, water quality conditions are very good. At this time, a simple ultrafiltration water purifier is used, and the problem is generally not big.
However, in areas with poor water quality, the ultrafiltration household water purifier appears to be stretched and cannot achieve the desired results. At this time, a reverse osmosis water purifier is needed.
In addition, the general water quality in the northern region is relatively hard. It is recommended to install a water softener to soften the water!

Key point 2: filter type and water purification material
At present, the mainstream filter elements on the market are PP cotton filter, activated carbon filter, ultrafiltration membrane, and RO membrane.
PP cotton filter mainly used to remove coarser particulate impurities in water;
Activated carbon filter element with the multi-pore surface, mainly used for adsorbing water, odor, residual chlorine and organic chemicals in water;
Ultrafiltration membrane with a filtration precision of 0.01 micron can effectively remove harmful substances such as sediment, rust, suspended solids, microorganisms, bacteria, viruses, rust and macromolecular organic substances in water;
RO membrane (also known as reverse osmosis membrane) is mainly used to remove all harmful substances such as pesticides, bacteria, viruses, heavy metals and ions in water. RO membrane filtration precision can reach 0.0001 microns.
One thing to note is that the water purifier level is not as good as possible. The key point is that the material is reliable.
The effectiveness of clean water is in principle determined by raw materials and production processes. A water purifier that does not meet the standard quality will not only fail to purify the water but may even cause pollution due to the material falling off.

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