Production method of calcium peroxide particles for slowly releasing oxygen

A technology of slow-release oxygen particles and calcium peroxide, applied in chemical instruments and methods, restoration of polluted soil, water/sludge/sewage treatment, etc. Lack of continuity and other problems, to achieve the effect of small secondary pollution, easy implementation and low cost

Inactive Publication Date: 2019-08-30
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology

From the perspective of oxygen release, when calcium peroxide is added to water, an immediate reaction will occur, which will rapidly increase the dissolved oxygen concentration in the water to a very high level, which exceeds the demand for oxidative degradation of pollutants, resulting in easy overdosing And lack of persistence, so controlled release technology is needed to control the rate of oxygen release
[0005] At present, a variety of controlled-release technologies for controlling CP have been reported, mainly relying on a variety of sol-gel-like curable materials to embed calcium peroxide, and the embedding materials mainly involved include concrete, alginate and polymer Vinyl alcohol, etc., but these embedding materials need to be dissolved in water first and then mixed with calcium peroxide. In this process, when calcium peroxide contacts with water, it will inevitably react and release part of oxygen, which is Reduced effective oxygen release from CP

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  • Production method of calcium peroxide particles for slowly releasing oxygen

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preparation example Construction

[0024] A preparation method of calcium peroxide slow-release oxygen particles, the specific preparation steps are as follows:

[0025] 1. Weigh a certain amount of polylactic acid particles, add it to dichloromethane with a mass-volume ratio of more than 2 times (that is, the ratio of the volume of dichloromethane to the mass of polylactic acid particles is greater than 2), and place it in a horizontal magnetic stirrer to stir To dissolve, the number of revolutions is 150rpm. After the polylactic acid is completely dissolved in dichloromethane, the stirring is stopped, and the solution is basically in a clear state.

[0026] 2. Weigh and add calcium peroxide powder equal to the mass of polylactic acid, and continue to stir and mix until the calcium peroxide is in a completely uniform suspension state.

[0027] 3. Volatilize the dichloromethane under constant stirring and ventilating conditions. When the dichloromethane gradually volatilizes until the mixture becomes a gel-lik...

specific Embodiment 1

[0029] Specific Example 1: The slow-release oxygen effect of preparing slow-release oxygen particles by mixing polylactic acid and calcium peroxide by equal mass

[0030] Weigh 7.2g of polylactic acid particles, add it into 500mL of dichloromethane, place it in a horizontal magnetic stirrer and stir to dissolve, the rotation speed is 150rpm. After the polylactic acid is completely dissolved in dichloromethane, the solution is basically in a clear state, weigh 7.2g of calcium peroxide powder, and continue to stir and mix, so that the calcium peroxide is in a completely uniform suspension state. After the dichloromethane gradually volatilized, the mixture was immediately filled into a tubular mold when it was in a gel-like semi-solid state, and formed into balls by extrusion and shearing. Place in a fume hood overnight to evaporate the dichloromethane completely. Finally, spherical calcium peroxide slow-release oxygen agent particles are obtained.

[0031] In a jar with a tota...

specific Embodiment 2

[0032] Specific Example 2: Maintain the aerobic state of activated sludge by using slow-release oxygen particles prepared by mass mixing polylactic acid and calcium peroxide

[0033] Prepare slow-release oxygen granules according to the above conditions of equal mass ratio, add 5g and 10g respectively to 100mL vials, the bottle is filled with 80mL activated sludge, the concentration of activated sludge is 3000mg / L, after adding slow-release oxygen granules Immediately stopper and seal. Among them, the dosage of 0g is used as a control, and the unsealed condition corresponds to the conventional aerobic shaking condition. The bacteria in the three groups of culture flasks were cultured in a shaker with a rotation speed of 150 rpm and a temperature of 30°C.

[0034] At the 72th hour of cultivation, the sludge in the group without slow-release oxygen agent was in a natural aerobic shaking culture, and the color of the sludge did not change significantly, while in the test groups ...

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Abstract

The invention discloses a production method of calcium peroxide particles for slowly releasing oxygen. The production method of the calcium peroxide particles for slowly releasing the oxygen comprisesthe steps of using calcium peroxide powder as an oxygen releasing agent, using polylactic acid particles as an embedding medium, using dichloromethane as an intermediate medium for dissolving the polylactic acid particles, after the dissolved polylactic acid particles and the calcium peroxide powder are completely mixed, conducting volatilizing under a ventilation condition to remove the dichloromethane, placing an obtained mixture in a tubular mold after the mixture is in a gelatinous semi-solid state, and conducting extrusion molding and shearing balling to finally obtain the calcium peroxide particles for slowly releasing the oxygen after the dichloromethane is completely volatilized. By means of the production method of the calcium peroxide particles for slowly releasing the oxygen, the calcium peroxide powder and the polylactic acid particles can be completely mixed and embedded, the oxygen release speed of the calcium peroxide in water can be effectively controlled, and in the production process, loss, due to contact between the calcium peroxide and the water, of an oxygen releasing component is avoided. The produced calcium peroxide particles for slowly releasing the oxygencan slowly and continuously release the oxygen in the water, and meanwhile, due to the biodegradability of the PLA, no secondary pollution is generated during material use.

Description

technical field [0001] The invention belongs to the technical field of soil and groundwater environmental protection, and in particular relates to a preparation method of calcium peroxide slow-release oxygen particles. Background technique [0002] In the removal process of organic pollutants, aerobic metabolism has more technical advantages than anaerobic metabolism because it can achieve complete mineralization. In the process of microbial aerobic metabolism of organic matter, organic matter is used as a carbon source and electron donor, and sufficient oxygen is required as an electron acceptor to achieve complete oxidation of organic matter, so that organic matter can be oxidized to carbon dioxide to achieve efficient removal. At present, in the process of biological remediation of soil and groundwater, there is a limiting bottleneck, that is, the lack of sufficient electron acceptors, which requires air or oxygen injection, ozone injection, microbubble injection, hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C02F1/00B09C1/08B09C1/00
CPCB09C1/002B09C1/08B09C2101/00C02F1/00C09K17/40
Inventor 朱煜谭学军殷瑶黄晟孙瑞高耘飞
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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