Is it necessary to install water treatment equipment in hotel canteens?

Hotel canteen water treatment equipment generally uses a central water purifier (pure water) with multi-stage water treatment. This can not only solve the hygiene problems of washing vegetables, rice washing and other cleaning water in the kitchen, but also solve the problem of kitchen cooking. Health issues related to drinking water for rice and soup, as well as scale issues in ice machines, steam engines, and rice steamers. Hotel canteen water treatment equipment can effectively remove sediment, rust, suspended pollutants, dust, colloids, bacteria, organic matter and other harmful substances in the water, bringing you healthy water quality and a safe life and work.

1. There are many types of water treatment equipment in hotel canteens:

1. Different water purifier structures have different water purification effects. Generally speaking, the first-level filtration water purifier has a simple structure and is mainly based on activated carbon. Its filtration capacity is limited and can only be used for coarse filtration. The filtered water is best heated and boiled for drinking.

2. Multi-stage filter water purifier. This kind of water purifier has two stages of rough filtration and a set of fine filtration, and the fine filtration mostly uses hollow fiber filter elements. The filtered water can be drank directly.

3. The reverse osmosis water purification machine has the best water purification effect. It has three-stage pre-filtration, one-stage reverse osmosis membrane precision filtration and one-stage post-filtration. The filtered water is free of bacteria, viruses, heavy metals, pesticides, organic matter, minerals and peculiar colors and odors. It is pure water and can be drank without heating.

2. Choose hotel canteen water treatment equipment based on water quality

1. The water hardness in different regions is different. The high hardness water in northern my country and the limestone areas in the south have calcium and magnesium ions in the water. It is high and easy to scale. You should choose an advanced filtration water purifier with an ion exchange resin filter element.

2. If the water contains chlorine, has a strong color and odor, and contains a lot of organic matter in city tap water, you can choose a water purifier with a larger amount of activated carbon. Because activated carbon has a strong adsorption effect on residual chlorine, strange colors and odors in water, it has a significant removal effect on organic matter.

3. If you want to drink it directly without heating, you should buy a reverse osmosis pure water machine.

3. Working principle of hotel canteen water treatment equipment

Most water bodies in the world are seriously polluted, exacerbating the contradiction of water shortage. Traditional tap water treatment methods can no longer guarantee the provision of high-quality drinking water, and there are still secondary pollution problems in municipal water supply, such as water supply from high-rise water tanks and long tap water delivery pipelines, which will cause potential rust, scale and Microbial and other pollution problems, therefore, various brands of water purifiers have emerged. Currently, water purifiers on the market can be divided into the following types according to water quality treatment methods:

1. Activated carbon adsorption

(can be divided into the following three forms) is more commonly used, and is mostly made of carbonaceous substances such as essence, coal, and nut shells (cores) through chemical or physical activation methods. It has a lot of micropores and specific surface area, so it has strong adsorption capacity and can effectively absorb organic pollutants in water. In addition, during the activation process, the amorphous parts of the activated carbon surface form some oxygen-containing functional groups. These groups enable the activated carbon to have chemical adsorption and catalytic oxidation and reduction properties, and can effectively remove some metal ions in the water.

2． Reverse osmosis membrane method

A type of membrane separation technology. This method uses pressure to pass water through a synthetic membrane. The membrane only allows pure water to pass through, while contaminants are eliminated. The R/O reverse osmosis technology used is a high-tech achievement carefully developed after years of hard work by the U.S. government and the Space Agency spending hundreds of millions of dollars to solve the problem of drinking water for astronauts on the moon. The cost is higher and suitable for areas with poor water quality.

3. Microfiltration and ultrafiltration methods

Microfiltration method is a microporous filter membrane made of cellulose or polymer materials, which uses its uniform pore size to intercept particles, bacteria, colloids, etc. in the water and prevent it from passing through the water. filter membrane and be removed. This microporous membrane filtration technology, also known as particle density filtration technology, can filter micron or nanoscale particles and bacteria. Both ultrafiltration and microfiltration are membrane separation technologies. There is no obvious boundary between the two. The working pressure of ultrafiltration is generally around 0.3 MPa, which can remove macromolecular substances, bacteria, viruses, etc. in the water, but the flux is low. .

4. Composite type

When one process is difficult to remove harmful substances in water, two or more processes are used, which is the composite type. Such as activated carbon adsorption, ultraviolet sterilization, activated carbon adsorption, reverse osmosis, activated carbon adsorption, microfiltration (ultrafiltration), polypropylene ultrafine fiber, activated carbon, microfiltration (ultrafiltration), etc. Among composite water purifiers, membrane technology composite water purifiers have excellent water purification performance, especially in removing microorganisms (bacteria, algae, etc.). The water produced by some high-quality water purifiers can be drunk directly. It has been welcomed by the majority of consumers and has become a hot spot in the current development of water purifiers.

It is not difficult to see from the above classification method of water purifiers that hotel canteen water treatment equipment is essentially a miniaturization of advanced water supply treatment. Its main treatment objects are turbidity, color, and abnormality in tap water. Smell and organic matter, etc. It generally consists of three parts: prefiltration (coarse filtration), adsorption, and fine filtration (microfiltration, ultrafiltration, reverse osmosis). Among them, adsorption (usually using activated carbon adsorption) and fine filtration are the main means to remove organic matter, odor and color in water. The objective operating conditions directly affect the quality of the water purifier. Household water purifiers serve thousands of households, but due to the large differences in water quality and water pressure conditions in the areas where they are used, users lack the necessary operating knowledge, and the current product design cannot cope with ever-changing situations. Therefore, water purifiers The manufacturer should consider allowing users to master certain professional knowledge and standardize the installation and operation of water purifiers, so that the water quality can achieve the desired effect and users can rest assured.

The design and manufacturing of water purifiers is a comprehensive science and technology. The design principles of water purifiers should be based on users. In terms of water quality characteristics in various regions of my country, organic matter pollution is serious along the Yangtze River and in densely populated areas, while bacterial contamination problems exist in small water supply companies in towns and cities and in groundwater use areas across the country. Therefore, only some high-quality water purifiers can adapt to different water qualities across the country. Therefore, water purifier manufacturers should carefully design water purifiers that can adapt to different water sources but have good treatment effects according to the water quality conditions in different regions.

IV. Principle of ultrafiltration membrane filtration of hotel canteen water treatment equipment

Ultrafiltration is a screening process using membrane separation technology, with the pressure difference on both sides of the membrane as the driving force. , using the ultrafiltration membrane as the filter medium, under a certain pressure of the ultrafiltration stainless steel water purifier, when the raw liquid flows through the membrane surface, the many tiny pores densely covered on the surface of the ultrafiltration membrane only allow water and small molecular substances to pass through. Permeate liquid, while substances in the original liquid whose volume is larger than the micropore size on the membrane surface are trapped on the liquid inlet side of the membrane and become concentrated liquid, thereby achieving the purpose of purifying, separating and concentrating the original liquid.

There are about 6 billion 0.01 micron micropores on the wall of each meter of ultrafiltration membrane wire. The pore size only allows water molecules, beneficial minerals and trace elements in the water to pass, while the smallest bacteria The volume is above 0.02 microns, so bacteria and colloids, rust, suspended solids, sediment, macromolecular organic matter, etc. that are much larger than bacteria can be intercepted by the ultrafiltration membrane, thus realizing the purification process.

The specific process is as follows:

1. Water production process of ultrafiltration membrane

Tap water first enters the ultrafiltration membrane tube. Under the action of water pressure difference, The many 0.01 micron micropores densely distributed on the surface of the membrane only allow water molecules, beneficial minerals and trace elements to pass through, becoming purified water. Harmful substances such as bacteria, rust, colloids, sediment, suspended solids, and macromolecular organic matter are trapped in the ultrafiltration membrane tube and are discharged when the ultrafiltration membrane is flushed.

2. Ultrafiltration membrane flushing process

After the ultrafiltration membrane is used for a period of time, harmful substances such as trapped bacteria, rust, colloids, suspended solids, and macromolecular organic matter will adhere to On the inner surface of the ultrafiltration membrane, the water production of the ultrafiltration membrane gradually decreases. Especially when the tap water quality is serious, it is more likely to cause clogging of the ultrafiltration membrane. Regular flushing of the ultrafiltration membrane can effectively restore the water production of the membrane.

5. RO membrane filtration principle of hotel canteen water treatment equipment

The pure water machine uses RO reverse osmosis technology. Reverse osmosis is also called reverse osmosis, which is driven by pressure difference. force, a membrane separation operation that separates solvent from solution.

Apply pressure to the material liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent will reverse osmosis in the direction of natural penetration.

The RO reverse osmosis membrane used in pure water machines is generally made of polymer materials. Such as cellulose acetate membrane, aromatic polyhydrazide membrane, aromatic polyamide membrane. The diameter of surface micropores is generally between 0.5 and 10nm, which is usually said to be one ten thousandth of a micron in filter pore size. Including the removal of impurities in the ionic state. Today, with various impurities emerging in an endless stream, pure water is attracting more and more attention.

The principle of reverse osmosis is to apply a pressure greater than the natural osmotic pressure on the raw water side, so that water molecules can reverse osmosis from the side with higher concentration to the side with lower concentration. Since the pore size of the reverse osmosis membrane is far smaller than hundreds or even thousands of times of viruses and bacteria, various viruses, bacteria, heavy metals, solid soluble matter, polluted organic matter, calcium and magnesium ions, etc. cannot pass through the reverse osmosis membrane at all. Thereby achieving the purpose of water purification.