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Method and device for degrading nitrobenzene waste water in high gravity field through catalytic ozonation

A technology of ozone degradation and supergravity field, applied in chemical instruments and methods, water treatment of special compounds, oxidized water/sewage treatment, etc., can solve problems such as ferrous ion precipitation, improve oxidation efficiency and prevent iron precipitation , the effect of reducing processing costs

Active Publication Date: 2015-06-17
ZHONGBEI UNIV
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  • Description
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Problems solved by technology

[0006] The purpose of the invention is to solve the problem of ferrous ions (Fe 2+ ) to solve the problem of precipitation, a method and device for catalytic ozone degradation of nitrobenzene wastewater in a supergravity field are provided

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  • Method and device for degrading nitrobenzene waste water in high gravity field through catalytic ozonation

Examples

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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 500 mg / L, and the pH value is 7.0. The inner diameter of the supergravity reactor packing is 0.4 m, the outer diameter is 0.75 m, and the rotation speed is 1200 rpm. Add divalent iron chelating agent to wastewater, the active ingredient is soluble iron salt with a ferrous iron concentration of 1g / L, and an iron salt chelating agent with a concentration of 2g / L, and the soluble iron salt is FeSO 4 ·7H 2 O, the iron salt chelating agent is ethylenediaminetetraacetic acid (EDTA), the ozone mixed gas flow rate is 75 L / h, the ozone concentration is 60 mg / L, and the liquid-gas ratio is 440 L / m 3 , add 10mL of ferrous iron chelating agent per liter of waste water. The waste water was recycled for 30 minutes, the content of nitrobenzene in the waste water was 1.4 mg / L, the removal rate of nitrobenzene reached 99%, and th...

Embodiment 2

[0029] Example 2: Using figure 1 The process shown is to treat waste water containing p-nitrophenol, the concentration of p-nitrophenol in the waste water is 300 mg / L, and the pH value is 8.0. The inner diameter of the supergravity reactor packing is 30 cm, the outer diameter is 60 cm, and the rotation speed is 900 rpm. Add a divalent iron chelating agent to the wastewater, the active ingredient is a soluble iron salt with a ferrous iron concentration of 8g / L, an iron salt chelating agent with a concentration of 10g / L, and the soluble iron salt is FeSO 4 ·7H 2 O, the iron salt chelating agent is ethylenediaminetetraacetic acid (EDTA), the ozone mixed gas flow rate is 75 L / h, the ozone concentration is 80 mg / L, and the liquid-gas ratio is 340 L / m 3 15mL of ferrous iron chelating agent is added per liter of waste water. The waste water was recycled for 25 minutes, and the removal rate of p-nitrophenol in the waste water reached 96%, and the removal rate of COD was 85%. Under...

Embodiment 3

[0030] Example 3: Using figure 1 The process shown is to treat wastewater containing 2,4-dinitrotoluene (2,4-DNT), with a pH value of 9.0. The concentration of 2,4-DNT in wastewater was 400 mg / L. The inner diameter of the supergravity reactor packing is 0.4 m, the outer diameter is 0.75 m, and the rotation speed is 500 rpm. Add divalent iron chelating agent to wastewater, the active ingredient is soluble iron salt with ferrous iron concentration of 3g / L, iron salt chelating agent with concentration of 5g / L, soluble iron salt is FeSO 4 ·7H 2 O, the iron salt chelating agent is ethylenediaminetetraacetic acid (EDTA), the ozone concentration in the ozone mixed gas is 100 mg / L, and the liquid-gas ratio is 240 L / m 3 , add 20mL of ferrous iron chelating agent per liter of waste water. The wastewater was recycled for 35 minutes, and the removal rate of 2,4-DNT in the wastewater was 95%, and the removal rate of COD was 90%. Under the same operating conditions, the removal rate of...

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Abstract

The invention provides a method and device for degrading nitrobenzene waste water in a high gravity field through catalytic ozonation, belongs to the technical field of nitrobenzene waste water ozonation degradation, and solves the problem that sedimentation of ferrous ions is caused when the initial pH value of the waste water is 7 to 10 in the conventional catalytic ozonation treatment method of nitrobenzene waste water. The method comprises the following steps: a ferrous iron chelating agent is mixed with nitrobenzene waste water of which the initial PH value is 7-10, the mixed solution is introduced into a high gravity reactor to react with ozone gas, and ozone dissolved in catalytic water generates hydroxyl free radicals, so that nitrobenzene compounds are degraded through ozonation. When the method provided by the invention is compared with the conventional bubbling reaction, the mass transfer rate of ozone is improved by two times; and besides, the ferrous iron chelating agent is combined with an ozonation process, therefore, ozone in the waste water is quickly decomposed, a lot of hydroxyl free radicals are generated, organic pollutants are quickly decomposed, and the oxidation efficiency is doubled; the process is simple, the treatment cost is reduced to the largest extent, the removal rate of nitrobenzene compounds reaches 95% or above, the mineralization rate reaches 80%, and the utilization ratio of ozone is improved by 1 to 2 times.

Description

technical field [0001] The invention belongs to the technical field of ozone oxidation and degradation of nitrobenzene wastewater, and in particular relates to a method and a device for catalytic ozone degradation of nitrobenzene wastewater in a supergravity field. Background technique [0002] With the rapid development of my country's national defense industry, nitrobenzene wastewater poses a serious threat to my country's precious water resources. Among many methods, the ozone oxidation technology has good treatment effect and less secondary pollution, but the direct oxidation of ozone has high selectivity and low oxidation efficiency, and the addition of catalysts to catalyze the hydroxyl radicals produced by ozonolysis has the characteristics of no selectivity and high oxidation efficiency. be widely used. [0003] Ferrous iron (Fe 2+ ) Catalyzing ozone to generate hydroxyl radicals to oxidize nitrobenzene compounds has many advantages, such as simple method, fast oxi...

Claims

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Application Information

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IPC IPC(8): C02F1/78C02F101/38
CPCC02F1/725C02F1/78C02F2101/38C02F2305/02
Inventor 刘有智焦纬洲祁贵生袁志国栗秀萍申红艳高璟罗莹张巧玲郭亮
Owner ZHONGBEI UNIV
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