A kind of nitrate sustained-release material and preparation method thereof

A slow-release material and nitrate technology, applied in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., to achieve good slow-release effect, slow release process, and inhibit the release of sulfur and phosphorus Effect

Inactive Publication Date: 2011-12-07
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no mature and effective slow-release nitrate material at home and abroad

Method used

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  • A kind of nitrate sustained-release material and preparation method thereof
  • A kind of nitrate sustained-release material and preparation method thereof
  • A kind of nitrate sustained-release material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve 4.3kg of calcium nitrate in 33.2kg of pure water, mix it with 62.5kg of No. 425 ordinary Portland cement, put it in a cement standard curing box for curing for 7 days, and crush the cured material into pieces Small pieces with a thickness of about 10 mm are obtained as nitrate slow-release materials.

Embodiment 2

[0019] Dissolve 15.8kg of calcium nitrate in 29.6kg of pure water, mix 45.5kg of ordinary Portland cement with 9.1kg of kaolin to obtain a mixture, then mix the nitrate solution and the mixture evenly, and then put it in cement for standard curing Carry out curing in the box for 7 days and solidify, and crush the cured material into small pieces with a block size of about 6 mm to obtain the nitrate slow-release material.

Embodiment 3

[0021] Dissolve 10.8kg of calcium nitrate in 23.7kg of pure water, mix 50.5kg of ordinary portland cement with 15kg of kaolin to obtain a mixture, then mix the nitrate solution and the mixture evenly, and then put it in the cement standard curing box Carry out curing in 7 days and solidify, and crush the cured material into small pieces with a block size of about 3 mm to obtain the nitrate slow-release material.

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Abstract

The invention discloses a nitrate slow-release material and a preparation method thereof. The nitrate slow-release material is prepared from the following raw materials, by mass, 45.5-62.5% of cement, 23.7-33.2% of water, 4.3-15.8% of a nitrate and 0-15% of clay mineral powder. The preparation method comprises the following steps: dissolving the nitrate into the water to obtain a nitrate solution; uniformly mixing the cement and the clay mineral powder to obtain a mixture; adding the resulting mixture to the nitrate solution, followed by carrying out concrete curing; crushing the cured material into the particles having a particle size of 3-10 mm to obtain the nitrate slow-release material. The nitrate slow-release material provided by the present invention has characteristics of slow releasing process, good slow-release effect, and easy adding way. In addition, the small amount of the nitrate slow-release material is added to the water body during using, the effect of the nitrate slow-release material can be generated for a long time after the nitrate slow-release material enters the sediment, the released nitrate from the nitrate slow-release material can be adopted as the bacterial to oxidize the electron acceptor of the organic contaminant, raise the oxidation-reduction potential of the sediment, inhibit releasing of sulfur and phosphorus, and has phosphorus adsorption effect so as to reduce the amount of the phosphorus released by the sediment. The nitrate slow-release material can be used in treating contaminated sediment in the river on a large scale.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a nitrate slow-release material for water environment restoration and a preparation method thereof. Background technique: [0002] At present, the technology of injecting nitrate (mainly calcium nitrate) into the polluted sediment for in-situ remediation has been widely researched and recognized. The beneficial effects of adding nitrate to the sediment mainly include: 1. Nitrate can be used as an electron acceptor for microorganisms (mainly denitrifying bacteria) to oxidize organic pollutants in the sediment to promote biodegradation; 2. Nitrate can improve The oxidation-reduction potential of sediment inhibits the release of phosphorus, and if calcium nitrate is added, calcium ions can also play a role in fixing phosphorus; 3. Increase the oxidation-reduction potential, inhibit the formation of sulfide, and eliminate the phenomenon of black and odor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/02C02F11/04
Inventor 陈繁忠余旭禄付广义
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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