Printing and dyeing sewage classification treatment process

Abstract

The invention discloses a printing and dyeing sewage classification treatment process. Printing and dyeing sewage is divided into two broad categories of chemical fiber sewage and cotton comprehensivesewage, the chemical fiber sewage is divided into two sub-categories of alkali-reduced sewage and chemical fiber general sewage, and then treatment is carried out; an alkali-reduced filtrate is incorporated into a chemical fiber general filtrate, subsequent physicochemical process is carried out after adjustment, a medicament can be effectively saved, and thus the operation cost is reduced; the cotton comprehensive sewage is subjected to alkaline process treatment, and is use as an alkali source for reversed adjustment of a mixed sewage III, and thus an alkali use amount of chemical fiber sewage can be saved; cotton desizing sewage, cotton printing sewage and cotton dyeing sewage are combined into one category of sewage, namely the cotton comprehensive sewage, the concentration of pollutants can be averaged each other through mixing of three kinds of sewage, and treatment difficulty is reduced; at the same time, a construction area is reduced; and a pH value of the cotton comprehensive sewage can be controlled centrally to create prerequisites for the next step of mixing with the mixed sewage III.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a sorting treatment process for printing and dyeing sewage. Background technique [0002] In the traditional printing and dyeing sewage treatment process, only the alkali reduction water is separated from other sewage, and the alkali reduction water is pretreated and then merged into other sewage. Its disadvantages are: cotton sewage is suitable for alkaline process treatment (ie, effluent PH>7.0 after reaction); and common chemical fiber sewage is suitable for acid process treatment (ie effluent PH <4.0) because of the requirements of antimony and TA removal. The agents and process control points applicable to the two processes are different. If they are not separated and mixed together for physical and chemical treatment, both chemical fiber sewage and cotton sewage will fail to achieve the purpose of physical and chemical treatment, and the waste of chemicals wi...

AI Technical Summary

Problems solved by technology

[0002] In the traditional printing and dyeing sewage treatment process, only the alkali-reduced water is separated from other sewage, and the alkali-reduced water is pretreated and then merged into other sewage. This kind of process has high physical and chemical costs and general effect.

Its disadvantages are: cotton sewage is suitable for alkaline process treatment (ie, effluent PH>7.0 after reaction); and ordinary chemical fiber sewage is suitable for acid process treatment due to the requirements of antimony and TA removal (ie reaction effluent PH<4.0)

The agents and process control points applicable to the two processes are different. If they are not separated and mixed together for physical and chemical treatment, both chemical fiber sewage and cotton sewage will fail to achieve the purpose of physical and chemical treatment, and the waste of chemicals will increase Operating costs

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