What are the methods of water treatment

Water treatment methods include physical treatment and chemical treatment. Human beings have used water treatment methods for many years. Physical methods include the use of various filter materials with different pore sizes, and the use of adsorption or barrier methods to exclude impurities in water. The most important adsorption method is to use activated carbon for adsorption. The barrier method is to pass water through the filter material, so that the larger impurities cannot pass through, and then obtain cleaner water. In addition, the physical method also includes the precipitation method, which is to let the impurities with a small specific gravity float on the water surface to remove them, or the impurities with a large specific gravity to settle down, and then obtain them. The chemical method is to use various chemicals to transform the impurities in the water into substances less harmful to the human body, or to concentrate the impurities. The chemical treatment method with the longest history can be regarded as adding alum to the water. After the impurities in the water are collected, the volume changes. Large, you can use filtration to remove impurities.