In-situ covering method for heavy metal in nano agustite immobilized sediment

A nano-hydroxyapatite and sediment technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as ineffective fixation of heavy metals, and reduce bioavailability, Improvement of water quality and wide range of applications

Inactive Publication Date: 2009-04-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials cannot effectively immobilize heavy metals, but only delay their diffusion into the aqueous phase.

Method used

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  • In-situ covering method for heavy metal in nano agustite immobilized sediment
  • In-situ covering method for heavy metal in nano agustite immobilized sediment
  • In-situ covering method for heavy metal in nano agustite immobilized sediment

Examples

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example 1

[0035] 1. Using Ca(OH) 2 Supernatant and phosphoric acid solution (both calcium phosphorus ratio is 1.67), at room temperature, pH value is 9, under reaction time 6 hours condition, adopts co-titration method to prepare nanoscale hydroxyapatite;

[0036] 2. Direct use of nano-hydroxyapatite (Ca 5 (PO 4 ) 3 (OH)) is nano-apatite, and the in-situ fixing material is laid, and the laying thickness is 5 cm;

[0037] 3. Then choose uncontaminated soil and lay it on the in-situ fixed material, with a thickness of 200 cm.

example 2

[0039] 1. Using Ca(OH) 2 Supernatant and phosphoric acid solution (both calcium phosphorus ratio is 1.67), at room temperature, pH value is 9, under reaction time 6 hours condition, adopts co-titration method to prepare nanoscale hydroxyapatite;

[0040] 2. Using nano-hydroxyapatite (Ca 5 (PO4 ) 3 (OH)) and nanofluoroapatite (Ca 5 (PO 4 ) 3 F) 50% each, mixed to prepare in-situ fixation material, i.e. nano-apatite

[0041] 3. Lay in-situ fixing materials with a laying thickness of 5 cm;

[0042] 4. Then choose uncontaminated soil and lay it on top of the in-situ fixed material, with a laying thickness of 200 cm.

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Abstract

The invention discloses an in-situ covering method for heavy metal in nano phosphorite fixed sediment, which comprises the following steps: preparing nano hydroxylapatite; preparing an in-situ fixing material, that is, adopting one or more than one material of the nano hydroxylapatite, nano fluorapatite or nano chlorapatite; and carrying out in-situ covering for polluted rivers or lakes. The method also comprises the step of using an in-situ covering material mixed by one or mixture of more than one of unpolluted sediment, earth or soil, wherein specific usage amount of the in-situ covering material is 10 to 490 centimeters of covering thickness. The total covering thickness of the in-situ fixing material and the in-situ covering material is between 0.05 and 500 centimeters. The in-situ covering method is used for restoring the sediments polluted by organic substances in the rivers or the lakes, can effectively prevent pollutants such as the heavy metal in the sediments from entering water body, has remarkable function of improving water quality, has the functions of fixing the heavy metal in the sediments, reducing biological effectiveness, and the like, and has the advantages of good effect, no secondary pollution, and wide application range.

Description

technical field [0001] The invention relates to a repair method for heavy metal polluted deposits. In particular, it relates to a method of fixing heavy metals in sediments by adding a nano-apatite covering layer, reducing their bioavailability, and reducing the release of heavy metals in sediments to water bodies, which affects human health. In-place coverage method. Background technique [0002] Water body sediment pollution is an important environmental problem worldwide. Its pollutants mainly enter water bodies through atmospheric deposition, wastewater discharge, soil erosion, rainwater leaching and scouring, and finally deposit in the bottom sediment and gradually enrich them. The sediment is seriously polluted. The pollution of water body sediment is an important factor affecting the quality of water body environment. This is because a considerable part of the pollutants entering the water body are usually stored in the sediment through adsorption or precipitation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F1/00
Inventor 祝凌燕张子种常春李孟岩
Owner NANKAI UNIV
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