Method for treating aromatic compound nitrification wastewater

A technology for aromatic compounds and nitrification wastewater, which is applied in water/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., and can solve the problems of secondary pollutants, such as solid waste iron sludge, ineffective decomposition of ozone, and increased treatment costs. Achieve the effect of recycling and zero emissions, reducing impact and reducing requirements

Active Publication Date: 2021-04-06
JIANGSU YANGNONG CHEM GROUP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN101597116B discloses a 2,5-dichloronitrobenzene wastewater treatment process, through neutralization of wastewater, catalytic electrolysis, catalytic oxidation, pressure filtration, adsorption treatment process to achieve the discharge of wastewater up to the standard, but due to the existence of Fe ions, a large amount of secondary pollutants, solid waste iron sludge, will be generated, which increases the treatment cost
[0006] CN111018264A discloses a process method for treating waste water of adjacent nitric acid, which adopts the combination scheme of advanced oxidation unit, electrodialysis unit, evaporation unit and biochemical unit, which can simultaneously realize Sodium sulfate recovery, water discharge up to standard and sludge reduction, this scheme uses hydrogen peroxide and ozone as oxidant, the process has the problem of ineffective decomposition of ozone, and the treatment cost is high

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  • Method for treating aromatic compound nitrification wastewater
  • Method for treating aromatic compound nitrification wastewater
  • Method for treating aromatic compound nitrification wastewater

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Embodiment 1

[0090] The present embodiment provides a kind of treatment method to adjacent nitric acid waste water, and described treatment method comprises the following steps:

[0091] (1) pump the adjacent nitric acid wastewater into the acid adjustment tank, add sulfuric acid to adjust the acid until the pH is 3, acidify the sodium phenate in the wastewater into phenol, remove the suspended solids in the wastewater through a 300-mesh filter, and obtain the impurity-removed effluent;

[0092] The adsorption tower is filled with coal-based columnar activated carbon with an iodine value of about 1100. The adsorption tower adopts the form of 3 towers in series, adopts the method of top in and bottom out, the temperature is 30°C, and the inflow flow rate is 1BV / h to obtain the adsorption effluent;

[0093] When the effluent COD of the first adsorption tower reaches 500ppm and reaches saturation, switch to regeneration. After washing, drying, thermal cracking and other processes, the saturate...

Embodiment 2

[0104] The present embodiment provides a kind of treatment method to adjacent nitric acid waste water, and described treatment method comprises the following steps:

[0105] (1) pump the adjacent nitric acid wastewater into the acid adjustment tank, add sulfuric acid to adjust the acid until the pH is 1, acidify the sodium phenate in the wastewater into phenol, remove the suspended solids in the wastewater through a 300 mesh filter, and obtain the impurity-removed effluent;

[0106] The adsorption tower is filled with coal-based columnar activated carbon with an iodine value of about 1100. The adsorption tower adopts the form of 3 towers in series, adopts the method of top in and bottom out, the temperature is 5°C, and the inflow flow rate is 10BV / h to obtain the adsorption effluent;

[0107] When the effluent COD of the first adsorption tower reaches 500ppm and reaches saturation, switch to regeneration. After washing, drying, thermal cracking and other processes, the saturate...

Embodiment 3

[0118] The present embodiment provides a kind of treatment method to adjacent nitric acid waste water, and described treatment method comprises the following steps:

[0119] (1) pump the adjacent nitric acid wastewater into the acid adjustment tank, add sulfuric acid to adjust the acid until the pH is 6, acidify the sodium phenate in the wastewater into phenol, remove the suspended matter in the wastewater through a 300 mesh filter, and obtain the impurity-removed effluent;

[0120] The adsorption tower is filled with coal-based columnar activated carbon with an iodine value of about 1100. The adsorption tower adopts the form of 3 towers in series, adopts the method of top in and bottom out, the temperature is 35°C, and the inflow flow rate is 0.1BV / h to obtain the adsorption effluent;

[0121] When the effluent COD of the first adsorption tower reaches 500ppm and reaches saturation, switch to regeneration. After washing, drying, thermal cracking and other processes, the satura...

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Abstract

The invention provides a method for treating aromatic compound nitrification wastewater, which comprises the following steps of: removing aromatic compounds in water in an adsorption mode after acid regulation, and separating sulfate radicals and nitrate radicals in a mode of adding divalent metal salt to realize recovery of the sulfate radicals and the nitrate radicals in the nitrification wastewater. Secondary pollution such as iron mud is avoided in the process, the influence on the quality of byproduct salt is reduced, the treatment effect is stable and reliable, the operation cost is low, and operation and industrial implementation are easy.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a treatment method for aromatic compound nitrification wastewater. Background technique [0002] The nitration products of aromatic compounds include nitrobenzene, nitrochlorobenzene, dichloronitrobenzene, dinitrobenzene, dinitrochlorobenzene, etc. The above-mentioned nitration products are important chemical intermediates and are widely used in pesticides, medicines, dyes, etc. , pigments and polymer materials and other fields. [0003] At present, the nitration products of aromatic compounds are mainly produced by mixed acid process, and phenol will be produced in the process. In order to ensure the safety of subsequent separation, alkali washing is usually used to remove the phenolic sodium salt formed from phenol, and a small amount of residual sodium phenolate and alkali are removed by water washing. The process will produce a certain amount of washing wastewater. I...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/06C01D5/16C01D9/08C01D9/16C01F11/46C02F101/10C02F101/16C02F101/34
CPCC02F9/00C01D5/16C01D5/06C01D9/08C01D9/16C01F11/468C01F11/46C02F1/283C02F1/66C02F1/001C02F1/722C02F1/02C02F2101/345C02F2101/101C02F2101/163C02F2209/08C01P2006/80
Inventor 王怡明徐林丁克鸿杨树斌王丹徐高明王再飞王建昌
Owner JIANGSU YANGNONG CHEM GROUP
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