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Method for purifying carbamide polluted water

A technology for polluting water and urea, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2008-05-21
太原海力丰科技发展有限公司
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Problems solved by technology

All these patents do not involve the purification of urea-containing sewage. The process of purifying urea-containing sewage faces the following technical and economic challenges: First, in the nitrogen oxide removal process, the concentration of urea aqueous solution is as high as 40wt%-50wt%. Very low concentration of urea in medium, usually less than 1%

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  • Method for purifying carbamide polluted water
  • Method for purifying carbamide polluted water

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[0029] The rate of urea-catalyzed hydrolysis is the key to the design of urea desorption water purification process. The following examples further reveal the effectiveness of effective catalysts and their concentrations for water purification by urea hydrolysis.

[0030]Example: Under different reaction conditions, the results of the measured urea hydrolysis rate are listed in Table 1. The urea analysis water is mixed with an appropriate catalyst solution, and the pH value of the reaction solution is adjusted to 14. The hydrolysis reaction is carried out in a high-pressure reactor, and the final reaction temperature is controlled between 100-170°C. The aqueous solution containing the catalyst and urea started to react and was heated for about 12 minutes. The temperature rose from 20°C to 100°C, and then rose to 170°C after 30 minutes. Samples were taken for analysis 30 minutes after the reaction started. For example, the hydrolysis rate at the final reaction temperature of 1...

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Abstract

A urea polluted water purification method is a catalytic hydrolysis method of removing urea pollutants from wastewater, which is discharged from chemical fertilizer plants. The hydrolysis catalysts include water-soluble catalysts or supported catalysts. The pH value of wastewater containing the catalysts is generally controlled to be larger than twelve. The purification and hydrolysis technology adopts a multifunctional reactor to realize the gas-liquid separation, the heat exchange and the catalytic hydrolysis, directly mixes steam and wastewater and separates ammonia through the gas stripping. With the heat exchange of treating water and urea desorbing water, the direct mixing and the heat exchanging of the steam and the urea desorbing water, the method lowers the energy consumption, removes the urea desorbing water in the polluted water which is discharged from the chemical fertilizer plant and recovers the ammonia. The national emission standard and the industrial water standard are achieved. The method can be applied to the improvement and the optimization of original hydrolysis technologies and equipments of plants.

Description

technical field [0001] The invention relates to a method for treating urea wastewater in a chemical fertilizer plant, in particular to a method for purifying urea wastewater by adopting a catalytic hydrolysis method and recovering ammonia and reused water. Background technique [0002] The sewage treatment of chemical fertilizer enterprises, especially the purification of urea analysis water, is mostly treated by deep hydrolysis process, but due to high energy consumption, high reaction temperature and pressure requirements, there are still phenomena of low device operation efficiency and substandard discharge, increasing It burdens enterprises and pollutes the environment. It is the idea of ​​the present invention to seek a low-consumption, high-conversion urea analysis water hydrolysis method. [0003] The urea analysis water discharged from the chemical fertilizer plant producing urea usually has a temperature between 50°C and 80°C, and the urea content is less than 1%. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C01C1/02
CPCY02P20/52
Inventor 张青林陈赵锁王玉平
Owner 太原海力丰科技发展有限公司
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