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Comprehensive treatment method for fluorescent brightener production wastewater

A technology of fluorescent whitening agent and waste water production, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, mechanical oscillation water/sewage treatment, etc. The problem of high cost, to achieve the effect of reducing cleaning costs, reducing equipment footprint, and slowing down pollution

Active Publication Date: 2012-02-15
HANGZHOU CREFLUX MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few researches on the wastewater produced by fluorescent whitening agents at home and abroad, and the existing treatment methods generally have the disadvantages of poor treatment effect or high treatment cost.
For example, the patent with the publication number CN 101423313A discloses the use of adding an ozone oxidation process after the aerobic treatment unit. The quality of the effluent water after treatment is better but the cost is higher, and because of the high oxidation of ozone, it brings inconvenience to the operation.
The patent with the publication number CN101538105A discloses a process for treating wastewater produced by fluorescent whitening agents by combining physicochemical and biochemical methods. The wet oxidation and biological filter unit are used, and the treatment cost is relatively high. In order to ensure the quality of the effluent, the aerobic unit is equipped with There is a sedimentation tank, which covers a large area

Method used

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  • Comprehensive treatment method for fluorescent brightener production wastewater
  • Comprehensive treatment method for fluorescent brightener production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Discharge the wastewater discharged from the fluorescent whitening agent production workshop into the adjustment tank; the effluent from the adjustment tank enters the coagulation sedimentation tank, and the chemicals polyaluminum chloride and polyacrylamide are added to the coagulation sedimentation tank. The dosage is: 100mg / L, respectively. 0.5mg / L, the coagulation time is 30min; then enter the hydrolytic acidification pool, the residence time is 15h; then enter the aerobic pool, the residence time is 12h, the dissolved oxygen content is 3mg / L, after the wastewater passes through the aerobic pool, the COD cr The removal rate of the aerobic tank reaches 80% to 90%; the effluent from the aerobic pool enters the ultrasonic degradation device with a frequency of 30KHz and an intensity of 50W, and then enters the membrane bioreactor tank. The membrane bioreactor adopts high-strength, anti-pollution hollow fiber curtain modules , The membrane module is installed vertically,...

Embodiment 2

[0015] Discharge the wastewater discharged from the fluorescent whitening agent production workshop into the adjustment tank; the effluent from the adjustment tank enters the coagulation sedimentation tank, and the chemicals polyaluminum chloride and polyacrylamide are added to the coagulation sedimentation tank. The dosage is: 500mg / L, 3mg / L, the coagulation time is 30min; then enter the hydrolytic acidification tank, the residence time is 18h; then enter the aerobic pool, the residence time is 15h, the dissolved oxygen content is 5mg / L, after the wastewater passes through the aerobic pool, the COD cr The removal rate of the aerobic tank reaches 80% to 90%; the effluent from the aerobic pool enters the ultrasonic degradation device with a frequency of 40KHz and an intensity of 60W, and then enters the membrane bioreactor tank. The membrane bioreactor adopts high-strength, anti-pollution hollow fiber curtain modules , The membrane module is installed vertically, the material is...

Embodiment 3

[0018] Discharge the wastewater discharged from the fluorescent whitening agent production workshop into the adjustment tank; the effluent from the adjustment tank enters the coagulation sedimentation tank, and the chemicals polyaluminum chloride and polyacrylamide are added to the coagulation sedimentation tank. The dosage is: 200mg / L, 0.5mg / L, the coagulation time is 30min; then enter the hydrolytic acidification pool, the residence time is 16h; then enter the aerobic pool, the residence time is 13h, the dissolved oxygen content is 4mg / L, after the wastewater passes through the aerobic pool, the COD cr The removal rate of the aerobic tank reaches 80% to 90%; the effluent from the aerobic tank enters the ultrasonic degradation device with a frequency of 25KHz and an intensity of 55W, and then enters the membrane bioreactor tank. The membrane bioreactor adopts high-strength, anti-pollution hollow fiber curtain modules , The membrane module is installed vertically, the material ...

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Abstract

The invention discloses a comprehensive treatment method for fluorescent brightener production wastewater. The fluorescent brightener production wastewater sequentially enters an adjusting tank, a coagulative precipitation tank, a hydrolytic acidification tank, an aeration tank, an ultrasonic wave degradation device and a membrane bioreactor; a flocculating agent and a flocculation aid are added into the coagulative precipitation tank; the wastewater stays in the hydrolytic acidification tank for 15 to 18 hours, and stays in the aeration tank for 12 to 15 hours; the frequency of the ultrasonic wave degradation device is 20 to 50 KHz, and the intensity is 30 to 80 W; the wastewater stays in the membrane bioreactor for 6 to 8 hours, and the MLSS reaches 20,000 to 30,000 mg / L; meanwhile, partial sewage is refluxed to the hydrolytic acidification tank from the membrane bioreactor, and the ratio of the reflux quantity of the sewage to the water inlet quantity is 100 to 300 percent. The method can effectively degrade refractory compounds in the fluorescent brightener production wastewater, and has denitrification effect simultaneously. The water quality of effluent completely meets the national 3-grade discharge standard; the problem that the fluorescent brightener production wastewater difficultly meets the standard is radically solved; and a secondary sedimentation tank is saved, so the wastewater treatment cost is low.

Description

technical field [0001] The invention relates to the field of refractory industrial wastewater treatment, in particular to a comprehensive treatment process for fluorescent whitening agent production wastewater. Background technique [0002] Fluorescent whitening agent is resistant to chlorine bleaching agent, oxygen bleaching agent and strong acid and strong alkali, and is widely used in textile, papermaking, coating, detergent, printing, ink and other fields. However, a large amount of wastewater will be produced during the production of fluorescent whitening agents. This wastewater is a special type of high-concentration, refractory organic wastewater. Wastewater COD cr 5000-10000mg / L, chloride ion concentration 14000-16000mg / L, suspended matter 350-450mg / L, ammonia nitrogen 400-500mg / L. Wastewater contains a large amount of benzene and its derivatives. These organic substances have substituent groups such as amino, nitro and sulfonic acid groups, and are highly toxic. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/36
Inventor 张星星包进锋
Owner HANGZHOU CREFLUX MEMBRANE TECH