Pretreatment method for neutralizing printing and dyeing waste water by using recovered carbon dioxide instead of waste acid

A technology for carbon dioxide, printing and dyeing wastewater, applied in neutralizing water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc., can solve the problems of sulfur poisoning biochemical treatment efficiency reduction, etc. The effect of carbon emissions
CN108545819AInactive Publication Date: 2018-09-18HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HOHAI UNIV
Publication Date
2018-09-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a pretreatment method for neutralizing printing and dyeing waste water. The carbon dioxide which is recovered, purified and liquefied in a chemical engineering garden is used for replacing the waste acid (sulphuric acid) to neutralize high alkalinity printing and dyeing waste water. Liquid state carbon dioxide in a storage tank is introduced into a tubular mixer by a self control feeding system through a vaporizer so as to be mixed with the printing and dyeing waste water; meanwhile, an online pH monitor is arranged in front of a mixing pool; the waste water pH value isfed back to the feeding system for automatically regulating and controlling the carbon dioxide adding quantity. The method has the advantages that the problem of anaerobe sulfur poisoning is relieved; the biochemical treatment efficiency is improved; meanwhile, the treatment cost of the printing and dyeing waste water is reduced; the carbon resource recovery and utilization are promoted.
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Description

Technical field:

[0001] The technical solution of the invention belongs to the field of industrial wastewater treatment, and in particular relates to a pretreatment method for printing and dyeing wastewater. Background technique

[0002] Printing and dyeing refers to the process of chemical treatment of textile materials (fibers, yarns, threads and fabrics). Printing and dyeing mainly includes several processes such as desizing, scouring, bleaching, mercerizing, dyeing, printing and finishing. Printing and dyeing wastewater refers to the wastewater discharged from the pretreatment, dyeing, printing and finishing processes of cotton, wool, hemp, chemical fiber or blended products. Printing and dyeing wastewater has the characteristics of high concentration of organic matter, large chroma, complex composition, large changes, and difficult treatment. It is a difficult-to-treat industrial wastewater.

[0003] There are four main treatment methods for printing and dyeing wastew...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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