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Stripping-ultrasound/electrolysis coupled degradation method and device for high-concentration nitrobenzene-containing wastewater

A nitrobenzene wastewater, ultrasonic technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of long treatment time, high cost, low treatment efficiency, etc., and shorten the treatment time. , the effect of reducing the processing cost

Inactive Publication Date: 2015-06-24
ZHONGBEI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of low treatment efficiency, long treatment time and high cost in the existing advanced oxidation method for degrading wastewater containing high concentration of nitrobenzene, the present invention provides a method for degrading wastewater containing high concentration of nitrobenzene by blowing off-ultrasonic electrolysis coupling Method and device for waste water

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  • Stripping-ultrasound/electrolysis coupled degradation method and device for high-concentration nitrobenzene-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Using figure 1 The flow shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the wastewater is 500mg / L, and the pH value is 6.8. The inner diameter of the supergravity reactor packing is 40 mm, the outer diameter is 75 mm, and the rotation speed is 900 rpm. The gas-liquid ratio of fresh air and waste water in the high-gravity equipment during the stripping process is 200 m 3 / L. When the concentration of nitrobenzene in the wastewater is reduced to 80 mg / L, the treatment time can be shortened by 80% compared with the traditional stripping equipment, and the stripping efficiency is significantly reduced afterwards. At this time, the wastewater is sent to the wastewater coupling reactor, and the ultrasonic / electrolytic oxidation technology is used for advanced treatment, and the ultrasonic sound intensity is 0.1W / cm 2 , when the frequency is 20kHz, the increased current density is 20mA / cm 2 , Ti-coated RuO...

Embodiment 2

[0029] Example 2: Using figure 1 The procedure shown treats a water sample containing nitrobenzene at a concentration of 800 mg / L. The inner diameter of the supergravity reactor packing is 30 mm, the outer diameter is 60 mm, and the rotation speed is 1200 rpm. The gas-liquid ratio of fresh air and waste water in the high-gravity equipment during stripping is 400 m 3 / L, when the concentration of nitrobenzene in the wastewater is reduced to 90 mg / L, the treatment time can be shortened by 80% compared with the traditional stripping equipment, and the stripping efficiency will be significantly reduced afterwards; at this time, ultrasonic / electrolytic oxidation technology is used for Deep treatment, ultrasonic sound intensity is 0.3 W / cm 3 , when the frequency is 40 kHz, increase the current density to 10mA / cm 2 , Ti-coated RuO 2 The electrode is the anode, and the copper sheet is the cathode. The removal rate of nitrobenzene is 95% after the total process treatment for 60 mi...

Embodiment 3

[0030] Example 3: Using figure 1 The shown procedure treats a water sample containing nitrobenzene at a concentration of 1200 mg / L. The inner diameter of the supergravity reactor packing is 0.6 m, the outer diameter is 1.4 m, and the rotation speed is 1500 rpm. The gas-liquid ratio of fresh air and waste water in the high-gravity equipment during the stripping process is 600 m 3 / L, when the concentration of nitrobenzene in the wastewater is reduced to 100 mg / L, the treatment time can be shortened by 80% compared with traditional stripping equipment, and the stripping efficiency will be significantly reduced afterwards; Deep treatment, ultrasonic sound intensity is 0.5 W / cm 3 , when the frequency is 50 kHz, increase the current density to 5mA / cm 2 , Ti-coated RuO 2 The electrode is the anode, and the copper sheet is the cathode. The removal rate of nitrobenzene is 98% after the total process treatment for 70 minutes. Under the above experimental conditions, the ultrasoni...

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Abstract

The invention belongs to the technical field of nitrobenzene wastewater treatment, and provides a stripping-ultrasound / electrolysis coupled degradation method and device for high-concentration nitrobenzene-containing wastewater, which are designed for solving the problems that existing methods for degrading nitrobenzene wastewater are low in treatment efficiency, long in treatment time and too high in cost. The high-concentration nitrobenzene containing wastewater is fully contacted and reacted with fresh air in a supergravity facility so as to complete stripping mass-transfer for reducing the nitrobenzene content of the wastewater, the wastewater produced after the stripping mass-transfer is completed is conveyed to a coupling reactor consisting of an ultrasound field and an electrolysis field, and then nitrobenzene substances are degraded under the synergistic effect of ultrasound and microelectrolysis. By using a stripping method, after the target pollutant content of wastewater is reduced, the wastewater is subjected to an oxidation reaction, so that the water quality change of the wastewater is minimized and the generation of intermediate products is lowered, therefore, the generation of hydroxyl radical expendables is reduced, and the oxidation efficiency is improved. An effect that the treatment time is reduced by 60-80% and the treatment cost is reduced by 50% under the condition that no ozone oxidizer is additionally added is achieved.

Description

technical field [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, and specifically relates to a process method for degrading wastewater containing high-concentration nitrobenzene by coupling blow off-ultrasonic electrolysis, which adopts blow off method, ultrasonic technology and electrolysis to act together. Background technique [0002] Nitrobenzene compounds are toxic organic pollutants that are difficult to degrade. They are volatile and highly toxic, and are listed as priority pollutants at home and abroad. Due to the stable structure of nitrobenzene, in practical engineering applications, it is often difficult to achieve satisfactory treatment results in the treatment of this type of wastewater with conventional processes and biological treatment methods. [0003] Air blowing is generally installed at the bottom of the water treatment with an aeration device. The air sent by the fan is dispersed into tiny bubbles, forming a gas-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/38
Inventor 刘有智焦纬洲栗秀萍申红艳高璟张巧玲祁贵生罗莹袁志国郭亮
Owner ZHONGBEI UNIV
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