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In nature, most surface water and groundwater contain a large amount of chemical dissolved substances, insoluble impurities and microorganisms. If they are directly used as drinking water without treatment, they will have adverse effects on the human body. Such as heavy metal ions in water, bacteria and viruses and harmful chemicals can cause the human body to contract various diseases. The various elements needed by the human body contained in the water will also affect the human body if it exceeds the allowable limit for health in one day, ranging from discomfort to life-threatening in severe cases, especially brackish water with high hardness and high salt content, which cannot be drunk at all. Natural water is generally treated before it can be used as drinking water.
At present, the most common water desalination methods in the world are: electrodialysis, evaporation and reverse osmosis. Among them, the reverse osmosis method is suitable for raw water with a salt content of 500-35000 mg/L liter. It removes bacteria and most organic matter while desalting, and the water quality of the water is not like the evaporation method. The reverse osmosis product water retains a very small part of the salt content (permeability <3%), and with the change of the raw water salt content, the product water has the same change. Therefore, reverse osmosis membrane separation technology is currently widely used in the treatment of civil drinking water in the world, such as desalination of seawater and bitter brine to produce drinking water.
The principle of reverse osmosis membrane separation technology is based on the fact that various liquids have osmotic pressure. A natural infiltration device is the infiltration of water from a low salt concentration to a high salt concentration. Until a pressure equilibrium equal to the osmotic pressure difference is established. In reverse osmosis, the high-concentration solution is pressurized to make it greater than the osmotic pressure on both sides of the membrane. At this time, water will preferentially pass through the membrane from the high-concentration solution into the low-concentration solution. The structure of the reverse osmosis membrane is not an ordinary filter membrane, and it can only be seen with a high-power electron microscope to be as fine as less than 10A. The smallest bacteria are 300 times larger, and the smallest germs are more than eight times larger.
First we must understand the role of water in the movement of life. When relatively pure water enters the human body, since the water can contain very few soluble substances, it can accommodate a large amount of foreign soluble substances. Everywhere: On the other hand, a large number of toxins and various impurities in the body will also quickly diffuse into the water and be excreted through various ways, which will undoubtedly play a good role in promoting human health. Therefore, some scholars believe that less soluble substances are the characteristics of high-quality drinking water, and this water is beneficial to health. If the human body ingests water containing a large amount of chemical dissolved substances from the outside, the nutrients that may be dissolved in the water after entering the human body will be reduced, and the function of water transporting nutrients cannot be effectively played. At the same time, after the impure water enters the human body, not only the internal The discharge of toxins and metabolites will be reduced, and a large number of inorganic ions and organic substances will destroy the normal mass balance in the human body and increase the burden on the internal organs, especially the kidneys. Therefore, the medical community advocates that people with kidney disease should drink reverse osmosis water.
Most of the raw water from nature contains elements necessary for life, but the content of some elements in the bitter brine often exceeds the maximum allowable concentration, which will affect human health after drinking, and bring adverse effects to human diet. Such as fluorine, the normal human body contains a total of 26 grams of fluorine, which has important physiological functions in the body. When fluoride is deficient or excessive, it will affect the human body. In addition, since many elements coexist in water, when they are taken into the human body together, intricate antagonism or synergy will often occur between each other, affecting the physiological balance in the body, and some non-essential elements are replaced or replaced. Elements necessary for the human body, the excess of some elements will affect the absorption of other elements, etc., the harm to human health is more serious, the impure water itself can contain toxic and harmful elements and bacteria that can make people sick, such as organic Mercury can cause Minamata disease and more.
Drinking reverse osmosis water can be beneficial to the metabolism of the human body, so that the human body can better absorb nutrients and excrete toxins in the body, which is beneficial to health. Of course, it is undeniable that while applying reverse osmosis membrane separation technology to remove harmful substances in water, it also removes most of the elements necessary for the human body in the water, so that the amount of these elements that the human body can absorb from drinking water is correspondingly reduced. However, the way the human body obtains these elements mainly relies on food. Compared with the content of these elements in food, the types of these elements in water are limited and the content is extremely small.
Since the water quality of each area is affected by other geographical conditions, it is impossible to provide the human body with the required minerals in a comprehensive and sufficient manner, and the impact of water quality on human health is a slow long-term effect, because the reflection of compliance with sanitation standards Permeate water is safe and reliable as drinking water.
