Wastewater treatment method

A wastewater treatment and treatment method technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve uneconomical, inability to achieve effective separation and recovery, increase ion exchange method and Membrane wastewater treatment difficulty and other issues

Active Publication Date: 2013-07-17
TSINGHUA UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

The above methods can effectively separate the waste liquid with simple components, but for the waste water produced by the sol-gel method to prepare nuclear fuel, various substances interact with each other, and any conventional method cannot achieve effective separation and recovery of useful components.
For example, in the commonly used radioactive wastewater treatment methods, the evaporation method is suitable for treating medium and high radioactive wastewater, but it is very uneconomical to treat low-level radioactive wastewater. In addition to safety factors, secondary pollution caused by mist entrainment and other reasons must also be considered; However, the high nitrate content in wastewater greatly increases the difficulty of wastewater treatment by ion exchange and membrane methods.
So far, there is no complete process flow for treating this wastewater. Facing the commercialization trend of high-temperature gas-cooled reactors, the production of fuel elements is moving toward scale, and there is an urgent need for a set of fuel element manufacturing wastewater treatment methods that meet production requirements.

Method used

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  • Wastewater treatment method

Examples

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Embodiment 1

[0037] During the production of a certain batch of fuel elements, about 250 liters of ammonia-containing process wastewater needs to be treated. NH in the raw water 3 - The mass concentration of N is 8.9%, the concentration of uranium is about 10mg / L, the concentration of ammonium nitrate is 12.4g / L, and the COD value of organic matter is 4×10 4 . In order to realize the removal and recovery of the main components in wastewater, the following schemes are adopted: recovery of ammonia by evaporation → filtration to remove solid impurities and organic macromolecules → adsorption on silica gel → recovery of uranium by desorption → recovery of ammonium nitrate by crystallization (such as figure 1 shown).

[0038] The waste water is firstly heated by the evaporator in the evaporative ammonia removal device, and the evaporated ammonia is absorbed with deionized water. After ammonia removal, the mass concentration of ammonia in the wastewater is reduced to 0.9%, and the recycled amm...

Embodiment 2

[0044] During the production process of a certain batch of sol-gel preparation process to prepare uranium oxide ceramic particles, about 200 liters of ammonia-containing process wastewater needs to be treated, and the NH in the raw water 3 - The mass concentration of N is 1.3%, the concentration of uranium is about 50mg / L, the concentration of ammonium nitrate is 5g / L, and the COD value of organic matter is 4×10 5 . In order to realize the removal and recovery of the main components in the wastewater, the following schemes are adopted: recovery of ammonia by evaporation → filtration to remove solid impurities and organic macromolecules → adsorption on silica gel → recovery of uranium by desorption → recovery of ammonium nitrate by crystallization.

[0045] The waste water is firstly heated by the evaporator in the evaporative ammonia removal device, and the evaporated ammonia is absorbed with deionized water. After ammonia removal, the mass concentration of ammonia in the was...

Embodiment 3

[0051] About 100 liters of ammonia-containing process wastewater needs to be treated during the production of uranium oxide ceramic particles prepared by a certain batch of sol-gel preparation process, and the NH in the raw water 3 -The mass concentration of N is 5.7%, the concentration of uranium is about 0.05mg / L, the concentration of ammonium nitrate is 50g / L, and the COD value of organic matter is 10 3 . In order to realize the removal and recovery of the main components in the wastewater, the following schemes are adopted: recovery of ammonia by evaporation → filtration to remove solid impurities and organic macromolecules → adsorption on silica gel → recovery of uranium by desorption → recovery of ammonium nitrate by crystallization.

[0052] The waste water is firstly heated by the evaporator in the evaporative ammonia removal device, and the evaporated ammonia is absorbed with deionized water. After ammonia removal, the mass concentration of ammonia in the wastewater ...

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Abstract

The invention provides a treatment method of low-radioactivity wastewater with complex components and high salt content. The wastewater treatment method comprises the following steps of: removing ammonia by evaporating, and recycling ammonia vapor; removing solid substances and macromolecular substances in the wastewater by removing; adsorbing uranium after pre-treating the filtrate; leaching adsorbent, desorbing the uranium and regenerating the adsorbent; and carrying out concentration crystallization separation onto the uranium-removed wastewater to obtain the solid ammonium nitrate. The wastewater treatment method is capable of realizing the recycling of useful substances ammonia, uranium and ammonium nitrate without generating secondary liquid waste and waste.

Description

technical field [0001] The invention belongs to the field of waste water treatment and relates to a treatment method for waste water with complex components, high salt content and low radioactivity. Background technique [0002] The preparation of ceramic particles by sol-gel method has been widely used. The ceramic core of the high temperature gas-cooled reactor nuclear fuel element is prepared by the sol-gel method. The core has good safety after multi-layer cladding, so it has potential application prospects in nuclear reactor types such as molten salt reactors and pressurized water reactors. The preparation process of the spherical core includes wet method and dry method (the preparation of spherical UO2 ceramic particles by Sol-Gel method, Journal of Inorganic Materials, 2007, 22(2), 259). Wherein the wet method includes steps such as dissolving, gelling, dispersing, aging, washing and drying. Firstly, an aqueous solution of uranyl nitrate is prepared by heating and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 陈晓彤权英王阳卢振明刘兵唐亚平
Owner TSINGHUA UNIV
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