Due to the rapid development of modern industry, the sources of acid-base sewage are very extensive. In industrial areas, some industrial sewage has a certain pH, which contains low-concentration acidic solutions, organic acids and other acidic substances, or low-concentration alkaline solutions, ammonia and other alkaline substances.

Acidic sewage is mainly the sewage discharged from the production process of the mining industry, electroplating industry, dye industry, chemical industry and steel industry, or the loss of heavy metal salts. Alkaline sewage is mainly the loss of raw materials discharged during the production process of oil refining industry, paper industry, leather industry, printing and dyeing industry. In addition to acids and alkalis, the acid-base wastewater usually contains acid salts, alkaline salts and other inorganic and organic substances.

What is the principle of industrial sewage treatment and purification

Since acid-base sewage is highly corrosive and needs to be properly treated before it can be discharged, the methods and principles of industrial sewage treatment mainly include the following points:

(1) For high-concentration acid-base sewage, priority should be given to whether such sewage can be recycled. According to water quality, water quantity and different process requirements, the factory or regional dispatch should be reused as much as possible. If it cannot be reused, acid and alkali can be recovered by concentration.

(2) For low-concentration sewage, if the amount of water is large, it will be concentrated into high-concentration acid-base sewage for use, such as the washing water of the pickling tank and the rinsing water of the alkali washing tank. If it cannot be used, the neutralization method can be used to neutralize acid and alkali sewage treatment.