Method for treating leather sewage

Abstract

The invention discloses a method for treating leather sewage. The method using coagulant for treatment of leather sewage has the advantages of good sewage treatment effect, sufficient reaction of the coagulant, few residual in the water and small dosage of the agent. A technical scheme is as below: adding coagulant in the sewage pipe or at the outlet by a spraying pipe. At least one additional pipe is connected to the spraying pipe, composite elements (or composite materials) used to improve the efficiency of the coagulant is added to the coagulant through the additional pipe, and the composite elements and the coagulant are mixed and sent into the sewage pipe or the sewage at the outlet. The coagulant is polymeric ferric sulfate, polymeric aluminium chloride diallyldimethylammonium chloride, diallyldimethylammonium chloride or acrylic amide copolymer; and the composite element is calcium chloride, magnesium chloride, magnesium sulfate, zinc sulfate, zinc chloride, phosphoric acid, sulfuric acid, hydrochloric acid, activated silicic acid, diallyldimethylammonium chloride, diallyldimethylammonium chloride or acrylamide copolymer.

Description

technical field [0001] The invention relates to a treatment method for leather sewage, which belongs to the technical field of sewage treatment. Background technique [0002] In leather sewage treatment and water purification, coagulation is one of the very important units. It uses coagulants to change the state of particles in water, so that suspended components and colloidal components in water are separated, and under certain conditions, they can be formed Sedimentation or air flotation separates flocs, and then separates this part of flocs by sedimentation or air flotation. In the coagulation treatment, the coagulant used for different types of sewage is the key to the treatment, so many researchers are actively researching and developing new composite coagulants or flocculants, while the existing treatment of leather sewage The various coagulants mainly use iron salt or aluminum salt, and do not make a good distinction for leather sewage; at the same time, the compoun...

AI Technical Summary

Problems solved by technology

In the coagulation treatment, the coagulant used for different types of sewage is the key to the treatment, so many researchers are actively researching and developing new composite coagulants or flocculants, while the existing treatment of leather sewage The various coagulants mainly use iron salt or aluminum salt, and do not make a good distinction for leather sewage; at the same time, the compounding process is also an important unit in sewage treatment, and there is a compounding time in the compounding process Some problems with the dosage, for example, in the process of treating leather sewage, there are problems such as the slow reaction between the coagulant and the leather sewage and the coagulant does not react with the suspended solids in the water, resulting in the metal elements in the coagulant remaining in the water , resulting in secondary pollution, at the same time the reaction of the coagulant is not complete, but also caused the waste of coagulant, and increased the cost of sewage treatment