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Method for removing radionuclide strontium in water

A radionuclide and water removal technology, applied in radioactive purification, nuclear engineering and other directions, can solve the problem of unsatisfactory removal of radioactive strontium in water, and achieve the effects of low cost, economic benefit, resource saving, and avoidance of secondary pollution

Pending Publication Date: 2020-04-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] In order to solve the problems existing in the prior art, the present invention provides a method for removing radionuclide strontium in water, which solves the problem of unsatisfactory removal effect of radioactive strontium in water in the prior art

Method used

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  • Method for removing radionuclide strontium in water
  • Method for removing radionuclide strontium in water
  • Method for removing radionuclide strontium in water

Examples

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Embodiment 1

[0056] Example 1: The two-stage BAC process has been in operation for 5 years, and the first-stage adsorption pool has failed to meet the requirements of the internal control indicators of the water plant, so it is set as the second-stage adsorption pool. The plant uses coagulation, sedimentation, two-stage BAC(O 3 / GAC) and filtration combined water treatment process, its production capacity is (200,000m 3 / d), the empty bed contact time EBCT of the AC bed is 14 minutes, the height of the AC bed is 2.0 meters, the ozone dose is 2.0-2.5mg / L, and the contact time is 24 minutes. The water source of the water plant comes from the HP River, and the average effluent quality of the water plant is better than the Chinese drinking water quality standard.

Embodiment 2

[0057] Example 2: The two-stage BAC process has been in operation for 6 years, and the first-stage adsorption pool has failed to meet the requirements of the internal control indicators of the water plant, so it is set as the second-stage adsorption pool. The plant used coagulation, sedimentation, filtration and two-stage BAC(O 3 / GAC) combined water treatment process with a production capacity of (260,000m 3 / d), the empty bed contact time EBCT of the AC bed is 14 minutes, the height of the AC bed is 1.8 meters, the ozone dose is 1.8-2.0 mg / L, and the contact time is 20 minutes. The water source of the water plant comes from the CJ River, and the average effluent quality of the water plant is better than the Chinese drinking water quality standard.

Embodiment 3

[0058] Example 3: The two-stage BAC process has been in operation for 7 years, and the first-stage adsorption pool has failed to meet the requirements of the internal control indicators of the water plant, so it is set as the second-stage adsorption pool. The plant used coagulation, sedimentation, filtration and two-stage BAC(O 3 / GAC) combined water treatment process, its production capacity is (100,000m 3 / d), the empty bed contact time EBCT of the AC bed is 14 minutes, the height of the AC bed is 2.0 meters, the ozone dose is 2.0-2.5mg / L, and the contact time is 22 minutes. The water source of the water plant comes from the HP River, and the average effluent quality of the water plant is better than the Chinese drinking water quality standard.

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Abstract

The invention discloses a method for removing radionuclide strontium in water. The method comprises the following steps: measuring the effluent quality of a BAC process, testing and characterizing anactivated carbon sample used in the BAC process, and carrying out practical application. According to the method, the BAC process does not need to be reconstructed or the steps of pretreatment, post-treatment and the like do not need to be added, energy is saved, and in-situ reutilization of the activated carbon used in the BAC process is achieved; according to the method for removing the radionuclide strontium (Sr) in the water by using the BAC process, the actual factors of the traditional water treatment are fully considered, so that the purposes of making the best use of materials and saving resources are achieved. Compared with a single treatment process, the method is combined with a traditional water treatment process, is low in cost, environmentally friendly and good in economic benefit, saves resources and has positive significance in promoting social sustainable development.

Description

technical field [0001] The invention relates to the field of removal of radioactive nuclide strontium (Sr) in water, in particular to the removal of Sr by a biologically activated carbon (BAC) feedwater advanced treatment process. Background technique [0002] 1. Radioactive strontium and its hazards [0003] The atomic number of strontium is 38, the relative molecular mass is 87.62, it belongs to alkaline earth metal, and its density is 2.60g / cm 3 , a melting point of 769°C and a boiling point of 1384°C. It is an active positive metal that is easily oxidized to stable and colorless Sr 2+ , chemical properties similar to calcium and barium. exist in nature 84 Sr, 86 Sr, 87 Sr, 88 There are four stable isotopes of Sr, and the most common of the 16 radioactive isotopes is 90 Sr. [0004] normally, 90 Sr in soluble ionic form Sr 2+ present in water bodies, 90 Sr has high solubility, transferability, and is easily absorbed by the human body. It is a source of bone-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12
CPCG21F9/12
Inventor 董丽华潘淑杰伍成梁侯立安张光辉顾平
Owner TIANJIN UNIV
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