1. Mineralization method
It refers to adding mineral elements beneficial to the human body (such as calcium, zinc, strontium and other elements) to the water on the basis of purification. The purpose is to exert The health benefits of mineral water. Commercially available water purifiers generally achieve mineralization by adding medical stone to the water purifier.
2. Activated carbon adsorption
It is more commonly used and is mostly made of carbonaceous materials such as essence, coal, and fruit 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 give the activated carbon chemical adsorption and catalytic oxidation and reduction properties, and can effectively remove some metal ions in the water.
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 in the water. , bacteria, colloids, etc., so that they are removed without passing through the filter membrane. 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.
Extended information:
The reverse osmosis system is the core component of the entire water purification system. Only through reverse osmosis can water purification standards be achieved. Reverse osmosis systems mainly use membrane filtration technology. Water molecules can then pass through the reverse osmosis membrane. Other ions such as calcium, magnesium, sodium, etc. are discharged with the wastewater.
The principle of reverse osmosis desalination is to apply a pressure greater than the natural osmotic pressure to salty water (such as raw water), causing the osmosis to proceed in the opposite direction, pressing the water molecules in the raw water to The other side of the membrane becomes clean water, thereby achieving the purpose of removing salt from the water. This is the principle of reverse osmosis desalination.
Baidu Encyclopedia-Water Purification Technology