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Method for efficiently removing total nitrogen from printing and dyeing wastewater by combining multiple methods

A technology for printing and dyeing wastewater and printing wastewater, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. Effect

Active Publication Date: 2019-12-31
ZHEJIANG JIAMING DYEING & FINISHING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the total nitrogen content of sewage after treatment is still high and it is difficult to meet the discharge standards.

Method used

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  • Method for efficiently removing total nitrogen from printing and dyeing wastewater by combining multiple methods
  • Method for efficiently removing total nitrogen from printing and dyeing wastewater by combining multiple methods
  • Method for efficiently removing total nitrogen from printing and dyeing wastewater by combining multiple methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step, S1 ammonification, first introduces printing wastewater (total nitrogen about 600mg / L, ammonia nitrogen about 15 mg / L) into the ammoniation tank filled with activated sludge, and pours it into the printing wastewater in the ammoniation tank Add mercerizing lye to adjust the pH value of the printing wastewater to between 9 and 11; the higher the pH value, the better the ammoniation effect. During this period, the printing wastewater is kept in the ammoniation tank for 14 to 18 hours to ensure that the microorganisms in the activated sludge in the ammoniation tank fully decompose the organic nitrogen in the printing and dyeing wastewater into ammoniacal nitrogen. In this step, the ammonia nitrogen conversion rate of the printing wastewater after ammoniation treatment can reach 60% ± 5% to about (total nitrogen content about 600mg / L, ammonia nitrogen about 360mg / L), at this time, the ammonia nitrogen at the bottom of the ammonification pool Activated sludge...

Embodiment 2

[0046] The difference between this example and Example 1 is that the removal in the above step S2 can also be replaced by chemical sedimentation. The detailed steps are: after the printing wastewater is treated in step S1, ammonia nitrogen is converted into struvite: using magnesium salt and phosphate, according to the following formula:

[0047] Mg2+ + PO43- + NH4+ + 6H2O= MgNH4PO4.6H2O (1); Mg2+ + HPO42 - + NH4+ +6H2O=MgNH4PO4 .6H2O + H+ (2); Mg2+ + H2PO4- + NH4+ + 6H2O=MgNH4PO4 .6H2O + 2H+ (3 );

[0048] After the printing wastewater is blown off, the total nitrogen can be reduced by 60%±3% to about 240mg / L.

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Abstract

The invention provides a method for efficiently removing total nitrogen from printing and dyeing wastewater by combining multiple methods, wherein the method sequentially comprises: ammonification, air stripping, uniform mixing, scum removal, primary sedimentation, hydrolytic acidification, A2 / O efficient short-flow process treatment in an SBR pool, coarse filtration, fine filtration, ultrafiltration, and reverse osmosis membrane separation treatment. According to the invention, through the treatment of the steps, the removal rate of total nitrogen in printing and dyeing wastewater is effectively increased, the treated printing and dyeing wastewater can be recycled, the discharge rate and the utilization rate of sewage are reduced, and the method is worthy of vigorous popularization.

Description

technical field [0001] The invention relates to a method for treating printing and dyeing wastewater, in particular to a method for efficiently removing total nitrogen in printing and dyeing wastewater by combining multiple methods. Background technique [0002] The sewage discharged from textile printing and dyeing mainly contains total nitrogen, which is the most difficult to degrade, especially for cotton, rayon, MODAL, and LYCELL. For reactive printing, urea needs to be added to the slurry to moisturize, and steaming is required to improve color fastness. , Therefore, the water quality of the wastewater will change, especially the concentration of total nitrogen in the wastewater will increase. Therefore, the existing wastewater treatment facilities should be transformed to create a biological denitrification function, and implement short-process and efficient denitrification to reduce treatment costs and ensure that the effluent can stably meet the discharge standards. ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16C02F101/38
CPCC02F9/00C02F1/66C02F3/00C02F1/001C02F2001/007C02F1/5236C02F1/44C02F1/444C02F1/441C02F3/30C02F1/76C02F2101/16C02F2101/38Y02W10/10
Inventor 莫炳荣莫荣明杨广权莫东海
Owner ZHEJIANG JIAMING DYEING & FINISHING CO LTD
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