Method and device for strengthened ozone treatment of nitrobenzene waste water in high gravity filed

An ozone treatment, supergravity technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2015-06-17
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the low ozone utilization rate and high ozone concentration in the tail gas in the application of the existing rotary packed bed in the application of the ozone oxidation technology, resulting in waste of ozone resources and exhaust gas demand. Discharge can only be discharged after destruction treatment, which increases the cost of treatment. A method and device for treating nitrobenzene wastewater with supergravity enhanced ozone are proposed.

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  • Method and device for strengthened ozone treatment of nitrobenzene waste water in high gravity filed

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Effect test

Embodiment 1

[0036] Example 1: Using figure 1 The flow shown is for the treatment of wastewater containing nitrobenzene. COD in wastewater is 600mg / L. First, wastewater and ozone gas enter the high gravity rotating packed bed 4 to carry out the ozone oxidation unit. Gas volume ratio (liquid flow to gas flow) is 600 L / m 3 . After the reaction, the tail gas and wastewater enter the supergravity-electrolysis unit for electrolysis reaction. The electrolysis voltage is controlled at 2V, the speed is 600 rpm, and the liquid-gas volume ratio is 650 L / m 3 . The wastewater (containing hydrogen peroxide) after the electrolysis reaction is pumped into the high-gravity rotating packed bed 4, and then undergoes ozonation reaction with ozone gas again, and the cycle is like this. Finally, the effluent of the ozone oxidation unit is obtained, the COD is 60~80 mg / L, and the ozone in the tail gas discharged from the supergravity-electrolysis unit is lower than 0.1 ppm. The COD of the same wastewater...

Embodiment 2

[0037] Example 2: Using figure 1 The flow shown is for the treatment of DNT-containing wastewater. COD in wastewater is 1000mg / L. First, waste water and ozone gas enter the high gravity rotating packed bed 4 to carry out the ozone oxidation unit. The rotating speed of the high gravity rotating packed bed is 600 rpm, and the inlet gas phase ozone concentration is 45 mg / L. Gas volume ratio (liquid flow to gas flow) is 80 L / m 3 . After the reaction, the tail gas and wastewater enter the supergravity-electrolysis unit for electrolysis reaction. The electrolysis voltage is controlled at 14V, the speed is 400 rpm, and the liquid-gas volume ratio is 150 L / m 3 . The wastewater (containing hydrogen peroxide) after the electrolysis reaction is pumped into the high-gravity rotating packed bed 4, and then undergoes ozonation reaction with ozone gas again, and the cycle is like this. Finally, the effluent of the ozone oxidation unit is obtained, the COD is 80~100 mg / L, and the ozone ...

Embodiment 3

[0038] Example 3: Using figure 1 The flow shown is for treating wastewater containing TNT. COD in wastewater is 800 mg / L. First, the wastewater and ozone gas enter the high gravity rotating packed bed oxidation unit, the rotating speed of the high gravity rotating packed bed is 1000 rpm, the inlet gas phase ozone concentration is 25 mg / L, the liquid-gas volume ratio of wastewater to ozone in the high gravity rotating packed bed ( Liquid flow and gas flow) is 200 L / m 3 . After the reaction, the tail gas and wastewater enter the supergravity-electrolysis unit for electrolysis reaction. The electrolysis voltage is controlled at 8V, the speed is 300 rpm, and the liquid-gas volume ratio is 300 L / m 3 . The wastewater (containing hydrogen peroxide) after the electrolysis reaction is pumped into the high-gravity rotating packed bed 4, and then undergoes ozonation reaction with ozone gas again, and so on. Finally, the effluent of the ozone oxidation unit is obtained, the COD is 4...

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Abstract

The invention aims to provide a method and device for strengthened ozone treatment of nitrobenzene waste water in a high gravity filed, belongs to the field of nitrobenzene organic waste water treatment, and solves the problem of low ozone utilization ratio of a conventional rotating packed bed in the ozonation technology application. The method comprises the following steps: exhaust gas generated by ozonidation-oxidation reaction in the rotating packed bed and waste water are introduced into a hypergravity-electrolysis unit reactor, ozone and oxygen in the exhaust gas in the hypergravity-electrolysis unit reactor are reduced into hydrogen peroxide through electrocatalytical reduction; the generated hydrogen peroxide, along with the waste water, enters the rotating packed bed again in a circulation manner to be subjected to ozonidation-oxidation reaction; ozone is catalyzed to generate hydroxyl free radicals due to the fact that the content of the generated hydrogen peroxide is in the ozone decomposition acceleration concentration range, therefore organic matters in the waste water are decomposed through mineralization; the problem of exhaust gas treatment is solved, the recycle of the exhaust gas resources can be realized, the ozone can be catalyzed, the oxydative degradation efficiency is improved, when the method is compared with a process with a treatment process without hypergravity electrolysis stage, the oxidation efficiency is improved by 50%, the water treatment cost is reduced by 30%.

Description

technical field [0001] The invention belongs to the field of nitrobenzene organic wastewater treatment, and in particular relates to a method and a device for treating nitrobenzene wastewater with supergravity enhanced ozone. Background technique [0002] The organic substances contained in nitrobenzene wastewater are usually difficult to biodegrade. These organic substances have the "three causes" of carcinogenicity, teratogenicity and mutagenicity, which are extremely harmful and must be removed in depth. Ozone-based advanced oxidation technology has the advantages of high oxidation efficiency and non-selectivity, especially with the industrialization of large-scale high-efficiency ozone machines, making ozone oxidation more technically competitive. Hypergravity technology is a new technology with advantages such as high mass transfer efficiency, low energy consumption, and intensive equipment. Under the condition of supergravity, the gravitational acceleration g is very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 焦纬洲刘有智袁志国栗秀萍申红艳高璟张巧玲祁贵生罗莹郭亮
Owner ZHONGBEI UNIV
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