Hydroxyapatite-coating PRB filling material and preparing method and underground-water uranium removing application method thereof

A hydroxyapatite and filling material technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problem of reduced service life of osmotic reaction grids, unusable grids for powders, low adsorption capacity, etc. problems, to achieve the effect of ensuring stability and uniformity, stable coating quality, and high adsorption capacity

Inactive Publication Date: 2017-02-15
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the method for in-situ treatment of uranium pollution in groundwater is to use a reaction grid filled with zero-valent iron, but as the reaction proceeds, zero-valent iron will produce iron hydroxide, which will block the grid, leading to the application of the osmotic reaction grid. Lifespan is greatly reduced
Hydroxyapatite is a high-efficiency adsorption material for uranium and manganese, and is a relatively effective U removal material, but the adsorption capacity of natural hydroxyapatite is low, and the cost of artificially synthesized granular hydroxyapatite is very high, and The powder cannot be used for the grid, as in the existing literature, the report on titanium dioxide and carbon nanotubes coated with hydroxyapatite

Method used

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  • Hydroxyapatite-coating PRB filling material and preparing method and underground-water uranium removing application method thereof
  • Hydroxyapatite-coating PRB filling material and preparing method and underground-water uranium removing application method thereof

Examples

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Embodiment 1

[0031] Take 240 mL, the concentration is 0.25 mol / L H 3 PO 4 The solution is placed in a beaker, and the concentration of 0.25mol / l NH 3 ·H 2O solution into the beaker to adjust the pH value to 10, add crushed and screened rocks, pebbles, coarse sand and other inert materials can be one or more, the added particle size is greater than 100 mesh, stir evenly; 100 mL concentration is 1 mol / l Ca(NO 3 ) 2 4H 2 The O solution was slowly added to the beaker with constant stirring, and NH was continuously added during the reaction. 3 ·H 2 O solution to keep the pH value of the reaction solution constant to 10, let it stand for 24 h, and remove the reaction solution to obtain the hydroxyapatite-coated PRB active filler. In the hydroxyapatite-coated PRB active filler, hydroxyapatite and The composition mass ratio of the inert material is 0.1-0.5:1.

[0032] Fill the filler into a PRB simulation reaction column with a height of 200 mm and an inner diameter of 50 mm, and the urani...

Embodiment 2

[0037] Above the groundwater flow channel of a uranium mine tailings pond, the sand-bearing layer was dug out, rocks, pebbles, coarse sand, etc. were crushed and sieved, passed through a 100-mesh sieve, and the remaining sieved was taken for later use. Prepare 0.25 mol / l phosphoric acid solution, add 0.25 mol / l NH 3 ·H 2 O solution to adjust the pH to 10±1. Put rocks, pebbles, coarse sand, etc. above 100-mesh sieve into the mixture of phosphoric acid and ammonia water in a rated ratio, and add Ca(NO 3 ) 2 solution, and NH was continuously added during the reaction 3 ·H 2 O solution to keep the pH value of the reaction solution constant to 10, let it stand for 24 h, and remove the reaction solution to obtain the hydroxyapatite-coated PRB active filler, and finally control the mass ratio of hydroxyapatite to inert material to be 0.3: 1.0.

[0038] Fill the filler into the PRB reaction wall with a length of 5 m, a width of 5 m, and a thickness of 1 m, and sink it into the g...

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Abstract

The invention discloses a hydroxyapatite-coating PRB filling material and a preparing method and underground-water uranium removing application method thereof. The hydroxyapatite-coating PRB filling material is characterized in that the hydroxyapatite-coating PRB filling material is prepared with a silicon-containing and / or calcium-containing inert natural material as a body and a H3PO4 solution, a Ca(NO3)2.4H2O solution and a NH3.H2O solution as synthetic materials, wherein the particle size of the silicon-containing and / or calcium-containing inert natural material is larger than 100 mesh, and the mass ratio of hydroxyapatite to an inert material is (0.1-0.5):1. According to the hydroxyapatite-coating PRB filling material and the preparing method and underground-water uranium removing application method thereof, coating is carried out with a local inert material; as adsorption is generated on the surface of the material, the adsorption capacity of an adsorbent cannot be reduced when the surface of the inert material is coated with an active material; a PRB reactive barrier is buried into an underground-water flow channel and used for PRB uranium removing, and uranium pollution abatement in underground water is achieved; blocking of iron carbonyl can be avoided, and the hydroxyapatite-coating PRB filling material can also be recycled.

Description

technical field [0001] The invention belongs to the technical field of groundwater pollution treatment, and relates to the in-situ treatment technology of groundwater uranium and manganese permeation reaction grid PRB, in particular to a hydroxyapatite-coated PRB filling material and its preparation method and application method. Background technique [0002] Water pollution control measures and remediation technologies mainly include natural attenuation technology, ex-situ remediation technology and in-situ remediation technology. As the most widely studied and applied groundwater pollution remediation technology in recent years, in-situ remediation technology is to remove pollutants in situ in the aquifer of the polluted site by using various non-physical, chemical and biological techniques. [0003] At present, the most important in-situ remediation technologies for groundwater include hydraulic isolation system, aeration technology, biodegradation technology, osmotic rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12B01J20/10C02F1/28B01J20/30C02F101/20
CPCB01J20/048B01J20/10C02F1/281C02F2101/206G21F9/12
Inventor 张卫民郭亚丹李亦然潘志平
Owner EAST CHINA UNIV OF TECH
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