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Coupling treatment of ao printing and dyeing wastewater

A technology for printing and dyeing wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problems of high COD content, large treatment load, and low nitrogen removal efficiency. , to achieve the effect of obvious treatment effect, saving infrastructure costs and shortening wastewater treatment time

Inactive Publication Date: 2017-06-30
SHAOXING WATER TREATMENT DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing A / O method, such as low nitrogen removal efficiency, large processing load, and high COD content, the present invention provides a method for treating printing and dyeing wastewater with a new AO coupling process that can stably and efficiently remove nitrogen and phosphorus

Method used

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  • Coupling treatment of ao printing and dyeing wastewater

Examples

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Effect test

Embodiment 1

[0016] The method of the new AO coupling process of this embodiment to treat printing and dyeing wastewater, combined with figure 1 , the equipment adopted in this process is composed of a hydrolytic acidification tank 1, a middle sedimentation tank 2, an aeration tank 3 and a sedimentation tank 4. The corridor of the hydrolytic acidification tank 1 is a broken line structure, and an agitator is installed in it. The agitator stirs along the diagonal of the hydrolytic acidification tank 1; several aeration heads are installed in the aeration tank 3, and both the hydrolytic acidification tank 1 and the aeration tank 3 are plug-flow reaction tanks.

[0017] The above-mentioned equipment is used to treat the comprehensive printing and dyeing wastewater: the printing and dyeing wastewater enters the hydrolysis acidification tank 1, and after the average residence time (HRT) of the sewage in it is 13 hours, two parts of the water from the hydrolysis acidification tank 1: 2 / 3 enters t...

Embodiment 2

[0021] The method of the new AO coupling process of this embodiment to treat printing and dyeing wastewater, combined with figure 1 , the equipment used in this process is the same as that of Example 1, the difference is that: the printing and dyeing wastewater enters the hydrolytic acidification tank 1, and after the average residence time (HRT) of the sewage in it is 15 hours, the water from the hydrolytic acidification tank 1 is divided into two parts: 2 / 3 enters the intermediate sedimentation tank 2, and the remaining 1 / 3 directly enters the aeration tank 3; after the sewage reacts in the intermediate sedimentation tank 2, the facultative sludge deposited at the bottom of the intermediate sedimentation tank 2 flows back into the hydrolytic acidification tank 1, according to Production demand, the reflux ratio of facultative sludge is 65-70%; while the effluent from intermediate sedimentation tank 2 joins the sewage from hydrolysis acidification tank 1 and directly enters a...

Embodiment 3

[0024] The method of the new AO coupling process of this embodiment to treat printing and dyeing wastewater, combined with figure 1 , the equipment used in this process is the same as that of Example 1, the difference is that: the printing and dyeing wastewater enters the hydrolytic acidification tank 1, and after the average residence time (HRT) of the sewage in it is 11 hours, the water from the hydrolytic acidification tank 1 is divided into two parts: 2 / 3 enters the intermediate sedimentation tank 2, and the remaining 1 / 3 directly enters the aeration tank 3; after the sewage reacts in the intermediate sedimentation tank 2, the facultative sludge deposited at the bottom of the intermediate sedimentation tank 2 flows back into the hydrolytic acidification tank 1, according to Production requirements, the reflux ratio of facultative sludge is 75-80%; while the effluent from intermediate sedimentation tank 2 joins the sewage from hydrolysis acidification tank 1 and directly en...

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Abstract

The invention relates to a coupling treatment method of AO novel printing and dyeing wastewater, and belongs to the technical field of printing and dyeing wastewater treatment. The method comprises the following steps: printing and dyeing wastewater enters a hydrolysis-acidification tank, averagely stays for 10-18h and are divided into two parts, and the two parts respectively enter a mid-sedimentation tank and an aeration tank; facultative sludge obtained through a reaction in the mid-sedimentation tank flows back to the hydrolysis-acidification tank, water from the hydrolysis-acidification tank directly reacts with water distributed by the hydrolysis-acidification tank in the aeration tank for 15-25h, and obtained water is sent to a sedimentation tank; and water obtained after a reaction in the sedimentation tank is directly discharged, obtained aerobic sludge is divided into two parts, and the two parts of the aerobic sludge respectively flow back to the aeration tank and the hydrolysis-acidification tank and participate in corresponding reactions. The method used for treatment of comprehensive printing and dyeing wastewater has the advantages of low cost, short treatment time and obvious treatment effect, improves the COD removal rate by above 10%, and allows the nitrogen content and the phosphorus content of finally discharged water to be respectively lower than standards.

Description

technical field [0001] The invention relates to a method for treating printing and dyeing wastewater by a novel AO coupling process, and belongs to the technical field of printing and dyeing wastewater. Background technique [0002] Dye wastewater contains mostly nitrogen and phosphorus elements. In wastewater treatment, A / O method is widely used. For example, for anaerobic process, a variety of anaerobic reactors have been developed, such as EGSB, ABR, UASB, IC, etc.; for hydrolysis and acidification , derived a variety of hydrolysis acidification reactor types; for nitrogen and phosphorus removal, developed a treatment process with the function of nitrogen and phosphorus removal; however, with the maturity of the printing and dyeing process, the composition of printing and dyeing wastewater is becoming more and more complex, while the conventional The A / O method adopts an anaerobic section and an oxygen-enriched section. The anaerobic section is used to remove nitrogen and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 虞伟权宋华龙奚晓东钱建华
Owner SHAOXING WATER TREATMENT DEV