Preparation method of oxygen slow release preparation for repairing of contaminated site

A site restoration and slow-release agent technology, applied in the environmental field, can solve problems such as high pH value, uneven oxygen distribution, and fast release rate

Inactive Publication Date: 2015-04-29
ESD CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Calcium peroxide, magnesium peroxide, and barium peroxide are widely used solid powder oxygen-releasing agents in the bioremediation of soil and groundwater. However, due to the excessive release rate and oxygen Disadvantages such as uneven distribution, high pH value, and the need for multiple applications, especially the high pH value limits the growth and reproduction of microorganisms and affects the repair efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] At room temperature, pass the calcium peroxide particles through a 100-mesh sieve, weigh 1000 g of the separated calcium peroxide particles, weigh 200 g of potassium dihydrogen phosphate and 100 g of ammonium chloride, disperse and mix them uniformly, and obtain calcium peroxide and dihydrogen phosphate Mixture of solid particles of potassium and ammonium chloride.

[0024] Weigh 2500g of octadecyldimethyl tertiary amine, put it into a 10L stainless steel reactor, slowly heat up to 55°C, start stirring, slowly heat up to 58°C, and melt completely; add calcium peroxide, dihydrogen phosphate, A mixture of solid particles of inorganic ammonium salts; 10 minutes after full stirring, the octadecyl dimethyl tertiary amine is drained; then the solid material is transferred to a dryer for blast drying and recovery of octadecyl dimethyl tertiary amine, The blast temperature does not exceed 120°C, and the coated and dried solid calcium peroxide oxygen release agent particles are ...

Embodiment 2

[0027] At room temperature, pass the magnesium peroxide particles through a 100-mesh sieve, weigh 1200 g of the separated magnesium peroxide particles, weigh 200 g of sodium dihydrogen phosphate and 100 g of ammonium chloride, disperse and mix them uniformly, and obtain magnesium peroxide and dihydrogen phosphate Solid particle mixture of sodium and ammonium chloride.

[0028] Weigh 2500g of dodecyl dimethyl tertiary amine, put it into a 10L stainless steel reactor, slowly heat up to 30°C, start stirring, slowly heat up to 35°C, and melt completely; add magnesium peroxide, sodium dihydrogen phosphate, The mixture of solid particles of ammonium chloride; 10 minutes after full stirring, the dodecyl dimethyl tertiary amine was drained; then the solid material was transferred to a dryer, and the dodecyl dimethyl tertiary amine was blown dry. The wind temperature does not exceed 120°C, and the coated and dried solid oxygen-releasing agent particles are obtained and stored in a desi...

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PUM

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Abstract

The invention provides a preparation method of an oxygen slow release preparation for the repairing of a contaminated site, and belongs to the field of environmental protection technology. The adopted process comprises the following steps: firstly, mixing alkaline earth hyperoxide with dihydric phosphate and inorganic ammonium salt uniformly to obtain mixed solid particles; secondly, the mixed solid particles are coated with a long-chain tertiary amine ionic surface active agent and dried to obtain solid oxygen slow release preparation particles, so as to achieve the purpose that oxygen can be slowly released from the oxygen slow release preparation in soil and underground water; thirdly, the coated solid oxygen slow release preparation particles and permeable materials can be mixed uniformly, so that the permeability of an oxygen release material can be improved. With the adoption of the preparation method of the oxygen slow release preparation for repairing of the contaminated site, the prepared oxygen slow release preparation is especially suitable for in-situ pollution repairing of oil pollutants like benzenes, methyl tert-butyl ether and petroleum hydrocarbon; the oxygen slow release preparation can slowly release reactive oxygen, at the same time, load and slowly release nutrient substances needed by organisms, no pollution is caused to the environment, and the biological degradability is achieved.

Description

technical field [0001] The invention belongs to the field of environmental technology. Background technique [0002] The bioremediation method is used to remediate polluted soil and groundwater. Generally, in the presence of free oxygen, aerobic microorganisms are used to degrade organic pollutants. Therefore, the concentration of free oxygen in soil and groundwater is the key to the pollution remediation activities of aerobic microorganisms. factor. [0003] Calcium peroxide, magnesium peroxide, and barium peroxide are widely used solid powder oxygen-releasing agents in the bioremediation of soil and groundwater. However, due to the excessive release rate and oxygen Disadvantages such as uneven distribution, high pH value, and the need for multiple applications, especially the high pH value limits the growth and reproduction of microorganisms and affects the repair efficiency. Contents of the invention [0004] The invention provides a method for preparing an oxygen slo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/48C02F3/02B09C1/08C02F103/06
CPCB09C1/08C02F3/02C02F2103/06C09K17/40C09K17/48C09K2109/00Y02W10/10
Inventor 龚宇阳李东明穆成华
Owner ESD CHINA LTD
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