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Treatment method for dye intermediate para-ester production wastewater

A technology for dye intermediates and waste water production, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problem of large residual amount of alkylene oxide, high treatment cost and high waste water Concentration and other issues, to achieve good effect, high treatment efficiency, high organic load effect

Inactive Publication Date: 2014-09-10
泰兴锦汇化工有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the COD, high salinity, and large residual amount of alkylene oxide in the para-ester production wastewater are very lethal to the bacteria treated by biochemical treatment, but the wastewater treatment method of the high-pressure oxidation method requires high equipment and high treatment costs. Domestic production enterprises cannot afford
Microbial biochemical treatment method is recognized as one of the methods with high treatment efficiency and good effect, but it is difficult for general biochemical bacteria to treat. There have been a lot of researches on the treatment of waste water from para-ester production, but due to the high concentration, high salt, and refractory waste water characteristics, for some of the refractory characteristic organic substances, it is naturally difficult to completely decompose to achieve complete treatment

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Using acetanilide to synthesize dye intermediate para-ester wastewater, its characteristics: the salt content reaches 250000mg / L, the COD reaches 80000mg / L, the pH value is 7.6, the total phosphorus is 25mg / L, and the sodium sulfate content is 60000-65000mg / L.

[0035] Two: Put the waste water from para-ester production into the MVR desalination device to remove sodium sulfate so that the sodium sulfate content in the wastewater concentrate is 30,000-35,000 mg / L, and the COD reaches 75,000 mg / L. Specific operation: Pour the raw wastewater into the evaporator, start the axial flow pump, MVR and vacuum system, control the steam pressure to 0.5-1.0MPa, the negative pressure in the evaporator to 0.5-0.8MPa, and the temperature T: 95-98°C. Concentrate under high pressure until 25% to 5% of sodium sulfate crystals appear in the wastewater, pass the concentrated solution through a centrifuge to separate the sodium sulfate in the concentrated solution from the wastewater, and...

Embodiment 2

[0043] Use acetanilide to synthesize dye intermediate para-ester wastewater. The salt content in the wastewater is about 250,000 mg / L, the COD is 82,000 mg / L, the pH value is 7.5, the total phosphorus is 26 mg / L, and the sodium sulfate content is about 65,000 mg / L. Adopt the method of embodiment 1, control steam pressure 0.4~0.7MPa in MVR evaporation process, negative pressure in evaporator 0.5~0.7MPa, temperature 90~98 ℃, the dosing ratio of MVR concentrated centrifugal mother liquor and chlorine oxide is 10 : 2.3, other operations are the same as embodiment 1. Finally, the effluent of the sedimentation tank has a COD of 200-300 mg / L, a pH of 7.0-8.0, a total phosphorus of 0.6 mg / L, a BOD of 205 mg / L, and a chromaticity of 1.0.

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Abstract

The invention discloses a treatment method for dye intermediate para-ester production wastewater. The treatment method comprises the following steps: feeding the wastewater into a MVR (mechanical vapor recompression) evaporation system to concentrate and separate high-temperature sodium sulfate, carrying out mixed oxidation on concentrated liquor and chlorine monoxide, and then sequentially carrying out bubbling, dechlorination and filtering on the obtained product; after the obtained wastewater is subjected to water distribution and compound nutrients are added, feeding into a UASB (upflow anaerobic sludge blanket) tower to carry out anaerobic biological treatment, then feeding into a vertical oxidation tank, after the biochemical treatment and aeration of photosynthetic bacteria, feeding water discharged from the vertical oxidation tank into a CASS (cyclic activated sludge system) pool which contains sanitary sewage sludge strains and is provided with an aeration device and carrying out aeration biochemical treatment; and finally, carrying out precipitation on the obtained product. According to the treatment method disclosed by the invention, in accordance with the characteristics of high concentration organic wastewater, high salt, and complicated compositions of para-ester production wastewater, under the interaction of the steps, the para-ester production wastewater can be subjected to high-speed, high-efficiency and low-running-cost treatment, discharged water reaches GB8978-96 standards, and the COD (chemical oxygen demand) is less than 500 mg / L.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and specifically relates to a method for treating wastewater produced by a dye intermediate p-(β-sulfate ethyl sulfone) aniline [commonly known as p-ester]. Background technique [0002] The dye intermediate p-(β-sulfate ethyl sulfone) aniline [commonly known as p-ester] is one of the main raw materials for the production of reactive dyes, and the domestic demand is very large. There are more than 10 domestic enterprises producing p-ester, and the output Ranked first in the world. However, the COD, high salinity, and large residual amount of alkylene oxide in the para-ester production wastewater are very lethal to the bacteria treated by biochemical treatment, but the wastewater treatment method of the high-pressure oxidation method requires high equipment and high treatment costs. Domestic production enterprises cannot bear it. Microbial biochemical treatment method is recognize...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
Inventor 赵卫国陶新民
Owner 泰兴锦汇化工有限公司
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