Application of activated carbons in water treatment

According to statistics, the industrial wastewater discharged every year in my country is about 8×108 m3, which not only contains highly toxic components such as cyanide, but also contains metal ions such as chromium, zinc, and nickel. There are many wastewater treatment methods, mainly chemical precipitation method, electrolysis method and membrane treatment method, etc. This article introduces the activated carbons adsorption method. Activated carbon has a huge surface area and has high physical adsorption and chemical adsorption functions. Therefore, the activated carbon adsorption method is widely used in wastewater treatment. And it has the characteristics of high efficiency and good effect.

Activated carbons is a specially treated carbon with numerous small pores and a huge surface area, with a surface area of ​​500-1500 square meters per gram of activated carbon. Activated carbon has strong physical adsorption and chemical adsorption functions, and it also has detoxification effects. The detoxification effect is to use its huge area to adsorb the poison in the micropores of the activated carbon, thereby preventing the absorption of the poison. At the same time, activated carbon can be combined with a variety of chemical substances to prevent the absorption of these substances.

There are many types of activated carbon used in production. Generally made into powder or granular. Powdered activated carbon has strong adsorption capacity, is easy to prepare and low in price, but it is difficult to regenerate and generally cannot be reused. The granular activated carbon is more expensive, but it can be reused after regeneration, and the working conditions during use are better, and the operation and management are convenient. Therefore, granular activated carbon is often used in water treatment. Activated carbon adsorption refers to the use of the solid surface of activated carbon to adsorb one or more substances in water to achieve the purpose of purifying water.