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A method for recovering and purifying ammonia from ammonia nitrogen wastewater

A technology for ammonia nitrogen wastewater and ammonia gas, which is applied in the preparation/separation of ammonia, chemical instruments and methods, ammonia compounds, etc., can solve the problems of low purity of recovered products and high energy consumption, and achieve a reasonable energy balance and reduce Reaction temperature, the effect of realizing resource reuse

Active Publication Date: 2019-05-31
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at technical problems such as high energy consumption in the ammonia nitrogen stripping process of the existing ammonia nitrogen wastewater, the influence of high temperature on the adsorption material and the influence of water vapor on the adsorption process in the adsorption and purification process of crude ammonia gas, and the low purity of the recovered product (ammonia water or ammonium sulfate), etc., The invention provides a method for recovering and purifying ammonia gas from ammonia-nitrogen wastewater, which uses gas heat exchange and condensation as a characteristic process, and uses condensed water as an absorption liquid for recycling, thereby realizing enhanced removal, efficient recovery and purification of ammonia nitrogen

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  • A method for recovering and purifying ammonia from ammonia nitrogen wastewater
  • A method for recovering and purifying ammonia from ammonia nitrogen wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Utilize the method provided by the present invention to carry out small test experiment to the actual residual ammonia water of a certain coking plant in Shanxi, influent COD and NH 3 -N is about 5200mg / L and 1900mg / L respectively.

[0040] The remaining ammonia water is firstly removed by conventional pretreatment methods to remove oil, suspended solids, etc. in the water, and the pretreated residual ammonia water enters the air stripping system, and 5ppm of denitrification agent is added. The denitrification agent is composed of 10% ethylene glycol deaminase , 5% ferrate, 5% organic carboxylic acids, 5% hydrogen peroxide are miscible in aqueous solution. And 30% NaOH solution was used to control the pH of the wastewater during the reaction process to be 11, the reaction temperature was controlled to be 30°C, the experimental gas-water ratio was 800:1, and the stripping time was 2h. After the crude ammonia gas exported from the air stripping system is cooled by the he...

Embodiment 2

[0043] Utilize the method provided by the present invention to carry out experiment to the actual residual ammonia water of a certain coking plant in Shanxi, influent COD and NH 3 -N is about 5200mg / L and 1900mg / L respectively.

[0044] The remaining ammonia water is firstly removed by conventional pretreatment methods to remove oil, suspended solids, etc. in the water, and the pretreated residual ammonia water enters the air stripping system without adding denitrification agent, and uses 30% NaOH solution to control the pH of the wastewater during the reaction process. 14. Control the reaction temperature to 90°C, and the experimental gas-water ratio to 5500:1. After the crude ammonia gas exported from the air stripping system is cooled by the heat exchanger, the cooled liquid undergoes gas-liquid separation and returns to the stripping tower for secondary stripping. The cooled ammonia gas enters the adsorption device for the adsorption of organic waste , the adsorbent used ...

Embodiment 3

[0047] Utilize the method provided by the present invention to carry out experiment to the actual residual ammonia water of a certain coking plant in Shanxi, influent COD and NH 3 -N is about 5200mg / L and 1900mg / L respectively.

[0048] The remaining ammonia water is firstly removed by conventional pretreatment methods to remove oil, suspended solids, etc. in the water, and the pretreated residual ammonia water enters the air stripping system, and 15ppm of denitrification agent is added. The denitrification agent is composed of 15% ethylene glycol deaminase , ferrate 7%, organic carboxylic acids 15%, hydrogen peroxide 15% miscible in aqueous solution, and use 30% NaOH solution to control the pH of the wastewater in the reaction process to be 9, control the reaction temperature to 70 °C, and the experimental gas The water ratio is 3000:1. After the crude ammonia gas exported from the air stripping system is cooled by the heat exchanger, the cooled liquid undergoes gas-liquid s...

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Abstract

The invention discloses a method for recovering and purifying ammonia gas from ammonia nitrogen wastewater, and belongs to the field of wastewater treatment technology and resource utilization. The method provided by the invention comprises the following steps: step 1, blowing off ammonia and nitrogen-containing wastewater under alkaline conditions in an air blow-off manner, removing most of ammonia nitrogen and volatile organic matters in the wastewater, and discharging the wastewater into a sewage system for treatment after ammonia and nitrogen reach a standard, and performing subsequent treatment on a gas phase part (crude ammonia gas); step 2, conducting heat-exchanging cooling on the crude ammonia gas to separate water vapor in the crude ammonia gas; step 3, conducting adsorbing purifying on the crude ammonia gas through an adsorption process, and removing most of volatile organic matters mixed in the crude ammonia gas; step 4, absorbing the ammonia gas after adsorption and purification with water or sulfuric acid; step 5, adsorbing saturated adsorption material for regeneration, to achieve recycling. The method provided by the invention can greatly improve the ammonia nitrogen blowing-off efficiency under the premise of reducing energy consumption, and the ammonia gas can be recycled and can be effectively purified, to ensure the recyclable value of recovered resources.

Description

technical field [0001] The invention belongs to the field of waste water treatment technology and resource utilization, and more specifically relates to a method for recovering and purifying ammonia from ammonia nitrogen waste water. Background technique [0002] High-concentration ammonia-nitrogen wastewater comes from a wide range of sources, including residual ammonia water from coking plants, coal gasification wastewater, monosodium glutamate wastewater, and landfill wastewater. The ammonia nitrogen concentration of the above various wastewaters is different, and the composition is relatively complex, containing more organic matter. Excessive ammonia nitrogen content in the water body will cause the deterioration of the ecological environment of the water body, endanger aquatic organisms and human health, cause eutrophication of the water body, and increase the cost of water treatment. [0003] At present, for the treatment technology of high ammonia nitrogen wastewater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/10C01C1/242
CPCC01C1/022C01C1/10C01C1/242C01P2006/80
Inventor 张炜铭徐敬生吕路常毅李鹏飞汪林潘丙才
Owner NANJING UNIV
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