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A device for treating nitrobenzene wastewater

A technology for nitrobenzene and wastewater, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc. Equal problems, to achieve the effect of improving ozone utilization, improving treatment efficiency, and simple process flow

Active Publication Date: 2016-04-27
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2001, Sandilya et al. found that the gas-phase mass transfer process in a rotating packed bed has a lower mass transfer coefficient than that in a packed tower. The transfer rate is very small, the gas phase interface cannot be updated quickly, and the uneven distribution of the liquid phase in the packing will further reduce the mass transfer rate.
[0003] The research results show that: compared with the packed column, the liquid film mass transfer coefficient k L Increased by 2 to 8 times, the total volume mass transfer coefficient K of the liquid phase L The increase of a is more significant, reaching 1 to 2 orders of magnitude, which indicates that the supergravity effect has a significant strengthening effect on the gas-liquid mass transfer process controlled by the liquid film; it is also found that: the total volume mass transfer coefficient K of the gas phase G a also increases (but not as much as K L a), but the gas film mass transfer coefficient k G However, the change is very small, which shows that the effect of high gravity on the gas-liquid mass transfer process controlled by the gas film is not good. The main contribution to the increase of the total volume mass transfer coefficient of the gas phase is the use of fillers with a high specific surface area a due to

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  • A device for treating nitrobenzene wastewater
  • A device for treating nitrobenzene wastewater
  • A device for treating nitrobenzene wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Treatment of dinitrotoluene (DNT) in waste water from a propellant and explosive factory. The initial concentration of dinitrotoluene in the wastewater is 190mg / L. Micro-electrolysis is used to treat 2.5L of wastewater. At pH=3, the amount of iron powder added is 28g / L, and the mass ratio of iron to carbon is Fe:C=1:1. The reaction time is 1.5h, and the stirring speed of the stirrer is 200r / min, more than 80% of the nitro compounds are converted into aniline substances, and the liquid-gas volume ratio of the micro-electrolyzed water and ozone is 400L / m 3 , the ozone concentration is 50mg / L, the rotation speed of the rotating packed bed is 500rpm, and after 60 minutes of degradation, the pollutant removal rate is over 98%; while the wastewater without micro-electrolysis pretreatment has the same treatment capacity and ozone concentration The removal rate of its nitro compounds is only 50%. Micro-electrolysis pretreatment can significantly improve the biodegra...

Embodiment 2

[0042] Embodiment 2: Treatment of TNT wastewater. The concentration of trinitrotoluene in the waste water is 16 mg / L, and the pH value is adjusted to 3.0 with dilute sulfuric acid. Take 2L of water samples, and use micro-electrolysis to pretreat the wastewater. The amount of iron powder added is 10g / L, the mass ratio of iron to carbon is 1:1.5, the stirring speed is 400r / min, and the reaction time is 1.5h. More than 100% of nitro compounds are converted into aniline substances, and the liquid-gas ratio of micro-electrolysis water and ozone is 100L / m 3 , the ozone concentration is 25mg / L, the height of the rotating packed bed is 18cm, the diameter is 12cm, and the rotation speed is 1200rpm. After 30 minutes of reaction, the removal rate of organic pollutants in wastewater is almost 100%. However, the micro-electrolysis / ozone process has a pollutant removal rate of only about 40% when the liquid-gas ratio, ozone concentration, stirring speed, and reaction time are constant %, ...

Embodiment 3

[0043] Embodiment 3: Treatment of nitrobenzene wastewater. The concentration of nitrobenzene in the wastewater is 100mg / L, and the pH value is adjusted to 1.5. Take 3.5L of water sample, and use micro-electrolysis to pretreat p-nitrobenzene wastewater. The reaction time is 1h, the stirring speed is 600r / min, the iron powder addition is 20g / L, and the iron-carbon mass ratio is 3:1. , the reduction rate is over 96%, and the liquid-gas ratio of micro-electrolysis water and ozone is 50L / m 3 , the ozone concentration is 40mg / L, the height of the rotating packed bed is 18cm, the diameter is 12cm, and the rotation speed is 2000rpm. After 1 hour of reaction, the removal rate of organic pollutants in wastewater is almost 100%. Under the conditions of the same liquid-to-gas ratio, ozone concentration and reaction time, the removal rate of nitro compounds is only 20%. The micro-electrolysis / ozone process has a pollutant removal rate of about 50% when the liquid-gas ratio, ozone concent...

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Abstract

The invention belongs to the technical field of nitrobenzene waste water treatment, in particular to a device for adsorption, reduction, oxidation and degradation of nitrobenzene waste water, which solves the existing problems in the existing nitrobenzene waste water treatment. The main body of the rotary bed of the rotary packed bed consists of upper and lower parts: the gas collection chamber and the main chamber. The main chamber is equipped with a packing rotor that can rotate in reverse at a high speed. The inlet pipe of the rotating packed bed is connected to the ozone generator, and the liquid inlet pipe is connected to the micro The liquid inlet of the electrolytic cell, the liquid discharge pipe is connected to the liquid outlet of the micro-electrolytic cell, and the exhaust pipe is connected to the KI absorption liquid. The invention has the following beneficial effects: the process flow is simple, the operation is convenient, the three technologies are coupled, the advantages of various technologies are brought into full play, the purpose of treating waste with waste is achieved, and the treatment cost is reduced to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, and in particular relates to a device for treating nitrobenzene wastewater by adsorption, reduction, oxidation, and degradation. Background technique [0002] For example, Chinese patent 201310083327.5 discloses a method and device for adsorption-reduction-oxidation degradation of nitrobenzene waste water, but because the rotors of the rotating packed bed are of integral structure, that is, the packing in the rotor is driven by a single shaft to rotate , the first patent on high-gravity rotating bed was proposed by the British Imperial Chemical Industries (ICI) in 1979, the patent number is EP0002568, and the subsequent patents published at home and abroad basically continued this rotor structure. In 2001, Sandilya et al. found that the gas-phase mass transfer process in a rotating packed bed has a lower mass transfer coefficient than that in a packed tower. The transfe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/38
Inventor 刘有智焦纬洲袁志国祁贵生高璟栗秀萍张巧玲申红艳王建伟刘文丽郭亮
Owner ZHONGBEI UNIV