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Low-temperature plasma and microelectrolysis combined treatment method for nitrotoluene production sewage

A technology of low-temperature plasma and nitrotoluene, which is applied in natural water treatment, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as high concentration, high toxicity and difficult treatment, and complex sewage components, so as to eliminate pollution, Conducive to environmental protection, to achieve the effect of recycling

Active Publication Date: 2014-02-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The COD of this kind of sewage is generally above 30000mg / L, the total phenols are about 3000mg / L, and the nitro substances are up to 300mg / L. The sewage components are complex, the concentration is high, and the toxicity is difficult to treat.

Method used

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  • Low-temperature plasma and microelectrolysis combined treatment method for nitrotoluene production sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The sewage generated in the process of producing nitrotoluene is collected uniformly and then enters the adjustment tank, and the pH is adjusted to 2 with sulfuric acid.

[0026] (2) Sewage enters the micro-electrolytic cell for reaction. The mass ratio of iron filings and activated carbon in the micro-electrolytic cell is 2:1. At the same time, blast aeration is carried out. The gas-water volume ratio is 2.5:1. The residence time is 60 minutes. The effluent enters the sedimentation tank for Sedimentation removes sludge.

[0027] (3) The effluent from the sedimentation tank enters the low-temperature plasma reactor for reaction. The high-voltage discharge in the low-temperature plasma reactor is generated by a high-frequency high-voltage power supply. The power of the high-frequency high-voltage power supply is 20-100w, and the generated current frequency is 20kHZ; Needle-plate reactor, the specific specifications of the needle-plate reactor are designed according t...

Embodiment 2

[0030] (1) The sewage generated during the production of nitrotoluene is collected uniformly and then enters the adjustment tank, and the pH is adjusted to 3 with sulfuric acid.

[0031] (2) Sewage enters the micro-electrolytic cell for reaction. The mass ratio of iron filings and activated carbon in the micro-electrolytic cell is 3:1. At the same time, blast aeration is performed. The gas-water volume ratio is 2.5:1. The residence time is 60 minutes. The effluent enters the sedimentation tank for Sedimentation removes sludge.

[0032] (3) The effluent from the sedimentation tank enters the low-temperature plasma reactor for reaction. The high-voltage discharge in the low-temperature plasma reactor is generated by a high-frequency high-voltage power supply. The power of the high-frequency high-voltage power supply is 20-100w, and the frequency of the generated current is 20kHZ; the high-voltage discharge uses a needle-plate reactor, and the specific specifications of the needl...

Embodiment 3

[0035] In step (1), adjust the pH to 2; in step (2), the mass ratio of iron filings to activated carbon in the micro-electrolytic cell is 3:1, and other operating procedures are the same as in Example 1.

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Abstract

The invention discloses a low-temperature plasma and microelectrolysis combined treatment method for nitrotoluene production sewage. The low-temperature plasma and microelectrolysis combined treatment method comprises the following steps of regulating the pH value of the sewage, and then, enabling the sewage to enter a micro-electrolytic cell; settling the effluent, and then, removing sludge; enabling the effluent to enter a low-temperature plasma reactor, and treating the effluent by using plasmas, wherein the plasmas are generated through high-pressure gas-liquid mixed discharging; regulating the low-temperature plasma treated wastewater by adding alkaline, then, enabling the regulated low-temperature plasma treated wastewater to enter a biochemical system, and discharging the sewage after carrying out biochemical treatment. By using the low-temperature plasma and microelectrolysis combined treatment method, the COD (Chemical Oxygen Demand) of the nitrotoluene production sewage can be reduced to below 1500, and the B / C can be increased to over 0.3; in addition, the chemical structures of aromatic compounds with toxic and side effects in the sewage can be changed, so that the biochemical property of the sewage is greatly improved; after the sewage is biochemically treated, all main indexes of the effluent can be up to the first-grade discharging standard. The pollution caused by the discharge of the nitrotoluene production sewage is avoided, the environment is favorably protected, and the energy resources are recycled.

Description

technical field [0001] The invention designs a chemical sewage treatment method. In particular, it relates to a method for jointly treating sewage produced by nitrotoluene with low-temperature plasma and micro-electrolysis, and belongs to the field of industrial sewage treatment. Background technique [0002] In the process of producing nitrotoluene, a certain amount of sewage will be produced. The sewage is mainly produced in the nitrification process in the production process. The sewage mainly contains nitrophenol sodium salt, o-nitrotoluene, p-nitrotoluene, and m-nitrotoluene. Toluene, toluene and other organic substances. The COD of this kind of sewage is generally above 30,000 mg / L, the total phenol is about 3,000 mg / L, and the nitro substances are up to 300 mg / L. The sewage has complex components, high concentration, and high toxicity is difficult to treat. [0003] Micro-electrolysis technology, also known as internal electrolysis, iron reduction, iron-carbon metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F1/461C02F103/36
Inventor 孙亚兵李舜斌赵泽华何东
Owner NANJING UNIV
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