Method for catalytic ozonization treatment of acidic nitrobenzene wastewater

A technology of nitrobenzene wastewater and ozonation, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., can solve problems such as poor stability, reduced catalyst activity, equipment blockage, etc., and achieve reduced thickness , reduce economic costs, and efficiently remove the effect

Active Publication Date: 2016-08-24
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Fe 2+ It has poor stability and is easily oxidized to Fe in the environment 3+ , greatly reducing the activity of the catalyst, and the generated Fe 3 + Flocculation is prone to occur in water and cause equipment blockage

Method used

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  • Method for catalytic ozonization treatment of acidic nitrobenzene wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] use figure 1 The process shown is to treat acidic nitrobenzene simulated wastewater. The concentration of nitrobenzene in the wastewater is 150mg / L. The pH of the solution is adjusted to 1 with sulfuric acid and sodium hydroxide, the supergravity factor is 300, and the liquid flow rate is 40L / h. A certain amount of MnSO was added to 4 ﹒ h 2 O Make the concentration of manganese ions 400 mg / L, the flow rate of ozone-containing gas is 50 L / h, the ozone concentration is 10 mg / L, and a certain amount of H is added every 5 minutes 2 o 2 makes H 2 o 2 The concentration is 20 mg / L. The removal rate of nitrobenzene reached more than 89.23% after 30 minutes of circulating treatment; at this time, the removal rate of TOC reached more than 52%; and RPB-O 3 / H 2 o 2 Compared with the new technology, the ozone utilization rate is increased by 8%, and the treatment cost is reduced by 10%.

Embodiment 2

[0032] use figure 1 The process shown is to treat acidic nitrobenzene simulated wastewater. The concentration of nitrobenzene in the wastewater is 150mg / L. The pH of the solution is adjusted to 5 with sulfuric acid and sodium hydroxide, the supergravity factor is 80, and the liquid flow rate is 140L / h. Add Mn(NO 3 ) 2 . 4H 2 O Make the concentration of manganese ions 200 mg / L, the flow rate of ozone-containing gas is 70 L / h, the ozone concentration is 100 mg / L, and a certain amount of H is added every 5 minutes 2 o 2 make H 2 o 2 The concentration is 3 mg / L. The removal rate of nitrobenzene reached more than 91.75% after 25 minutes of circulating treatment; at this time, the removal rate of TOC reached more than 54%; and RPB-O 3 / H 2 o 2 Compared with the advanced technology, the ozone utilization rate is increased by 10%, and the treatment cost is reduced by 15%.

Embodiment 3

[0034] use figure 1 The process shown is to treat acidic nitrobenzene simulated wastewater. The concentration of nitrobenzene in the wastewater is 150mg / L. The pH of the solution is adjusted to 2 with sulfuric acid and sodium hydroxide, the supergravity factor is 10, and the liquid flow rate is 100L / h. MnSO 4 . h 2 O Make the concentration of manganese ions 100 mg / L, the flow rate of ozone-containing gas is 75L / h, the ozone concentration is 40mg / L, and a certain amount of H is added every 5 minutes 2 o 2 make H 2 o 2 The concentration of nitrobenzene was 10 mg / L, and the removal rate of nitrobenzene reached more than 99.51% after 15 minutes of circulating treatment; at this time, the removal rate of TOC reached more than 65%; and RPB-O 3 / H 2 o 2 Compared with the new technology, the ozone utilization rate is increased by 20%, and the treatment cost is reduced by 25%.

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Abstract

The invention belongs to the technical field of nitrobenzene wastewater treatment and particularly discloses a method for catalytic ozonization treatment of acidic nitrobenzene wastewater. The problems that in the prior art, the utilization rate of ozone under an acidic condition is low, Fe2+ is poor in stability and prone to be oxidized into Fe3+, the activity of a catalyst is greatly lowered, and generated Fe3+ is prone to flocculation in water to cause equipment blockage are solved. A rotating packed bed is used as a gas absorption and reaction device; the acidic nitrobenzene wastewater in which Mn2+ and H2O2 are dissolved, and ozone containing gas are introduced into the rotating packed bed simultaneously; the pH of the acidic nitrobenzene wastewater is regulated to range from 1 to 5 before the acidic nitrobenzene wastewater is pumped into the rotating packed bed. By means of the method, RPB-O3/H2O2 can generate a large quantity of hydroxyl free radicals under the acidic condition, and the acidic nitrobenzene wastewater can be removed efficiently.

Description

technical field [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, in particular to a method for catalytic ozonation treatment of acidic nitrobenzene wastewater. Background technique [0002] Nitrobenzene, referred to as NB for short, is an important chemical raw material and intermediate, which is widely used in petrochemical, dyestuff, material, pharmaceutical and other chemical fields. The density of nitrobenzene is higher than that of water and it will sink to the bottom of the water. It has a certain solubility in water. Nitrobenzene itself is highly toxic and will produce teratogenic, carcinogenic, and mutagenic effects. Therefore, nitrobenzene that enters the water is caused by Pollution will last for quite a long time, if it is discharged directly without treatment, it will cause serious harm to human body and environment. [0003] Ozone is a green and strong oxidant used in the field of wastewater treatment. At present, Japan,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F101/38
CPCC02F1/725C02F1/78C02F2101/38C02F2305/023
Inventor 刘有智焦纬洲王永红罗莹申红艳栗秀萍祁贵生袁志国张巧玲高璟
Owner ZHONGBEI UNIV
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