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Textile dyeing wastewater treatment and reclamation technique

A wastewater treatment, textile printing and dyeing technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as unsatisfactory effect, high chroma, and shortened membrane service life , to achieve the effect of enhancing competitive advantage, high pollutant concentration, and reducing operating costs

Active Publication Date: 2015-05-13
浙江巨能环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the investment and operating costs of the membrane process are too high, and the water quality characteristics of textile printing and dyeing wastewater can easily lead to membrane pollution and shorten the service life of the membrane.
At the same time, because the membrane treatment is a physical separation process, the concentrated wastewater after membrane treatment needs to be reprocessed to meet the discharge requirements. At this time, the concentrated wastewater treatment technology will be more difficult and more expensive. Other commonly used treatment methods usually have complicated processes. cumbersome, high operating costs and unsatisfactory effects in actual wastewater treatment operations
The main reason is that the wastewater quality is unstable, the chroma is high, or the additives used in some processes are not conducive to the growth of biological strains, so it is difficult to achieve standard discharge or reuse of wastewater

Method used

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  • Textile dyeing wastewater treatment and reclamation technique
  • Textile dyeing wastewater treatment and reclamation technique
  • Textile dyeing wastewater treatment and reclamation technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In conjunction with the accompanying drawings, the technical solution of the present invention is further described. It should be understood that these examples are only used to illustrate the present invention, not to limit the application scope of the present invention.

[0022] The waste water is pumped into the primary air flotation tank through the lifting pump of the regulating tank, the reflux ratio of the air flotation tank is adjusted to 10%, and the air holding pressure is controlled to 2.0MPa, so that the impurities in the waste water are adhered by the tiny bubbles formed and brought to the liquid The scum is formed on the surface, and then the scum is collected and discharged by the scum scraper to achieve the purpose of removing impurities in the wastewater, and the dissolved oxygen content in the wastewater is increased by air flotation.

[0023] The effluent from the first-stage air flotation directly enters the CBR reaction tank, and degrades the organi...

Embodiment 2

[0029] The waste water is pumped into the primary air flotation tank through the lifting pump of the regulating tank, the reflux ratio of the air flotation tank is adjusted to 40%, and the air holding pressure is controlled to 3.5MPa, so that the impurities in the waste water are adhered by the tiny bubbles formed and brought to the liquid The scum is formed on the surface, and then the scum is collected and discharged by the scum scraper to achieve the purpose of removing impurities in the wastewater, and the dissolved oxygen content in the wastewater is increased by air flotation.

[0030] The effluent from the first-stage air flotation directly enters the CBR reaction tank, and degrades the organic matter in the wastewater through the domesticated and membrane-hanging composite membrane mud reactor. Control the volume load in the CBR reaction tank to 5kgCOD / (m 3 d), the volume load of the ASB reaction tank is 1kgCOD / (m 3 d), control the dissolved oxygen concentration in th...

Embodiment 3

[0036] The waste water is pumped into the primary air flotation tank through the lifting pump of the regulating tank, the reflux ratio of the air flotation tank is adjusted to 20%, and the air holding pressure is controlled to 3MPa, so that the impurities in the waste water are adhered by the tiny bubbles formed and brought to the liquid surface , Form scum, and then collect and discharge the scum through the scum scraper to achieve the purpose of removing impurities in the wastewater, and increase the dissolved oxygen content in the wastewater through air flotation.

[0037] The effluent from the first-stage air flotation directly enters the CBR reaction tank, and degrades the organic matter in the wastewater through the domesticated and membrane-hanging composite membrane mud reactor. Control the volume load in the CBR reaction tank to 3kgCOD / (m 3 d), the volume load of the ASB reaction tank is 0.7kgCOD / (m 3 d), control the dissolved oxygen concentration in the aerobic rea...

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Abstract

The invention discloses a textile dyeing wastewater treatment and reclamation technique. The invention aims to provide a textile dyeing wastewater treatment and reclamation technique. According to the characteristics of textile dyeing wastewater, the existing biochemical and physicochemical treatment systems are reasonably combined to form a textile dyeing wastewater treatment technique which has the advantages of low cost, high treatment efficiency and stable system operation. The technique comprises the steps of pretreatment, secondary biochemical treatment and after-treatment. Floatation, CBR, ASB, precipitation, floatation, ozone and other processes are performed for treatment, so that the treated wastewater can finally be discharged after reaching the standard and satisfy the reclamation standard. The technique is suitable for textile dyeing enterprises with restricted water supply or restricted drainage capacity, and can implement energy saving and emission reduction for the enterprises and lower the operating cost.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a textile printing and dyeing wastewater treatment and recycling process. Background technique [0002] The textile printing and dyeing industry will produce highly polluted wastewater during the production process. This type of wastewater has a high concentration of suspended solids, high pollution indexes such as CODcr, BOD, and chroma, and the quality and quantity of the wastewater are unstable, making it difficult to treat. [0003] The treatment and reuse of textile printing and dyeing wastewater generally includes three treatment processes: the first step is to use ordinary physical, chemical and biochemical treatment processes to meet the standard discharge treatment of wastewater, and the second step is to conduct advanced treatment of wastewater that meets the discharge requirements; The third step is to further purify the tail water treated in the second step so that th...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 凌明沈学拯叶国祥
Owner 浙江巨能环境工程有限公司
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