Method for treating sewage from leather making

Abstract

The invention discloses a method for treating sewage from leather making, which comprises: performing the flocculating and settling treatment of the sewage; absorbing ammonia ions, proteins, amino acids, organic matters and pigment macromolecules in the sewage out by using active carbon columns in an acidic environment and realizing the treatment of the sewage; releasing the matters which are absorbed on the active carbon column from the active carbon column by using alkaline solution; and evaporating and concentrating releasing solution to obtain ammonia, proteins and amino acids. In the method, a biochemical basin with high energy consumption and operation cost is not used, sewage treatment and a production process and production operation are synchronized, production and management cost is reduced, a large amount of raw material is saved and electric cost is reduced. The sewage treatment is quick and efficient. In the swage treatment, the byproducts such as ammonia, proteins and amino acids can be extracted, economic benefit in sewage treatment is created, and the cost load of the sewage treatment is reduced.

Description

technical field [0001] The invention relates to a method for treating industrial sewage produced in leather manufacturing engineering. Background technique [0002] In the process of leather processing, a large amount of industrial sewage will be produced. There are a large number of chemical substances, heavy metal substances (chromium elements) in these industrial sewage, and nutrients such as animal protein and amino acids driven out of leather in a large number of tanning processes. Direct discharge will seriously pollute the environment. Therefore, the sewage generated by leather processing in tannery must be treated before discharge to make it meet the national discharge standard. [0003] At present, the industry generally adopts the combination of flocculation sedimentation method and biochemical pool oxidation method to treat leather industry sewage, as follows: first discharge the sewage into pools and ditches for exposure to the sun, so as to encourage wild micro...

AI Technical Summary

Problems solved by technology

The oxidation treatment process of the biochemical pool cannot be synchronized with the production of the factory, and its maintenance and labor costs are also very high

[0007] Furthermore, pigments will be produced during the growth of microorganisms, which will still have a certain impact on emissions

[0008] It can be seen that the above sewage treatment methods not only have unsatisfactory treatment effects, but also take a long time and have low efficiency. The heavy metal elements, proteins, amino acids and other economically beneficial substances in the sewage are wasted and cannot be separated and extracted, and they also consume a lot of electric energy. Water resources and the addition of a large amount of nutrients make the cost higher and bring a heavy burden to the leather industry

[0009] In addition, the organic nutrients such as protein and amino acid consumed by the biochemical pool of microorganisms are almost all digested and utilized by microorganisms. During this process, microorganisms emit carbon dioxide, which increases carbon emissions. From another perspective, This can also be said to have caused secondary pollution to the atmosphere