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Method for reduction treatment of nitrotoluene wastewater by using jujube-wood-sourced charcoal for catalyzing

A technology of nitrotoluene and jujube wood, which is applied in the field of catalytic reduction treatment of nitrotoluene wastewater from jujube wood source charcoal, achieving significant environmental and economic advantages, simple preparation, and simple and easy methods

Inactive Publication Date: 2012-08-22
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no chemical catalytic reduction treatment method for nitrotoluene substances, so it is necessary to develop a method for treating nitrotoluene wastewater that is mild in reaction conditions, easy to implement, fast and efficient

Method used

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  • Method for reduction treatment of nitrotoluene wastewater by using jujube-wood-sourced charcoal for catalyzing
  • Method for reduction treatment of nitrotoluene wastewater by using jujube-wood-sourced charcoal for catalyzing
  • Method for reduction treatment of nitrotoluene wastewater by using jujube-wood-sourced charcoal for catalyzing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Hydrosulfide reduction of 3-nitrotoluene

[0025] In 8 200ml anaerobic simulated reactors, adding pH is 7 phosphate buffers and concentration is the 3-nitrotoluene waste water of 100mg / L, is filled with 99.99% high-purity nitrogen in reactor (to remove reaction Oxygen in the system forms an anaerobic environment), add 35mg / L, 100mg / L, 170mg / L, 240mg / L reducing agent hydrosulfide respectively in the reactor, then, do not add catalyst in No. 1-4 reactor , in No. 5-8 reactor, add 60mg jujube source charcoal respectively (make its concentration be 0.3g / L) as reaction catalyst. The reactor was sealed and placed in a rotary oscillator, and the reaction was shaken at a speed of 150-200 rpm for 72 hours at normal temperature and pressure. The conversion rate of nitrotoluene is shown in Table 1.

[0026] The conversion rate of nitrobenzene under table 1 hydrogen sulfide reduction condition

[0027]

Embodiment 2

[0028] Example 2: Hydrosulfide reduction of 2-nitrotoluene, 3-nitrotoluene and 4-nitrotoluene

[0029] Different from Example 1, 100 mg / L of reducing agent hydrosulfide was added to 6 reactors respectively, then, no catalyst was added in No. 1-3 reactors, and 60 mg was added respectively in No. 4-6 reactors Jujube source charcoal (to make its concentration 0.3g / L) was used as a reaction catalyst. The reactor was sealed and placed in a rotary shaker, and the reaction was shaken at a speed of 150-200 rpm for 72 hours at normal temperature and pressure. The conversion rate of nitrotoluene is shown in Table 2.

[0030] The conversion rate of nitrotoluene under table 2 hydrosulfide reduction conditions

[0031]

Embodiment 3

[0032] Embodiment 3: Reductive conversion of 3-nitrotoluene under different catalyst concentration conditions

[0033] Different from Example 1, in 5 reactors, add respectively the reductant hydrosulfide of 100mg / L, then, add a certain amount of jujube wood source charcoal respectively in the reactor (making its concentration be 0.1,0.3,0.5 , 0.7, 1.0g / L) as the reaction catalyst. The reactor was sealed and placed in a rotary shaker, and the reaction was shaken at a speed of 150-200 rpm at normal temperature and pressure for 72 hours. The conversion rate of 3-nitrotoluene is shown in Table 3.

[0034] Table 3 Reduction transformation of 3-nitrotoluene under different catalyst concentration conditions

[0035]

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Abstract

The invention belongs to the technical field of wastewater treatment in environmental protection and relates to a method for the reduction treatment of nitrotoluene wastewater by using jujube-wood-sourced charcoal for catalyzing. The method mainly comprises the following steps of: adding a buffer solution and the nitrotoluene wastewater with finite concentration into an anaerobic simulated reactor containing pre-weighed jujube-wood-sourced charcoal powder; inflating 99.99% high-purity nitrogen into a reaction system so as to remove oxygen from the system to form an anaerobic environment; adding reductant hydrosulfide with finite concentration into the system; and finally, putting the reactor into a rotary shaker for carrying out shaking reaction at normal temperature and pressure. According to the method, the reaction system is moderate, the reaction is fast and efficient, and the treatment cost is low, so that the method for treating the nitrotoluene wastewater can solve practical problems and has remarkable economic and environmental advantages.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and relates to a method for treating nitrotoluene wastewater by catalytic reduction of jujube source charcoal. Background technique [0002] Nitrotoluene is an important intermediate of organic chemical raw materials, but it can cause diseases such as liver damage to humans and other organisms, and is mutagenic and carcinogenic to organisms. Most of these organic substances and their transformation products in the environment It is internationally recognized as a widespread dangerous pollutant. Among these compounds, p-nitrotoluene and m-nitrotoluene are two common pollutants. p-Nitrotoluene is an intermediate product in the manufacture of the explosive TNT. m-Nitrotoluene is irritating to the eyes, respiratory tract and skin. After entering the body through various channels, it can reduce the blood transport capacity, inhibit the central nervous system, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/34
Inventor 刘新会巩文雯陶莉刘冠男成登苗付文君
Owner BEIJING NORMAL UNIVERSITY
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