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Carbon-iron microbattery slow-release carbon source filler and preparation method thereof

A carbon-iron micro-battery and slow-release carbon source technology, applied in anaerobic digestion treatment and other directions, can solve the problems of low core strength, high pH in the effluent area, and blocked carbon source release, so as to improve biodegradability and avoid water effluent. The effect of high pH, ​​improving effluent quality and carbon source utilization

Inactive Publication Date: 2015-03-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a carbon The iron micro-battery slow-release carbon source filler and its preparation method can increase the strength of the core particles to 70-105N / particle, and at the same time, reduce the thickness of the slow-release shell to 1-1.5mm, so that carbon iron can be evenly distributed in the material

Method used

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  • Carbon-iron microbattery slow-release carbon source filler and preparation method thereof
  • Carbon-iron microbattery slow-release carbon source filler and preparation method thereof
  • Carbon-iron microbattery slow-release carbon source filler and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] In the present embodiment, the carbon-iron micro-battery slow-release carbon source filler used for groundwater pollution restoration, its preparation process is:

[0037] (1) Aerate the corn cob and corn stalk mixture of the core 4 material in ozone for 30 minutes, rinse with water twice, dry for 5 days, and set aside;

[0038] (2) pulverizing the natural carbon source material 1 obtained in step (1) to 60 mesh for subsequent use;

[0039] (3) Sponge iron 2 is crushed to 80 orders for subsequent use;

[0040] (4) Diatomite and quartz sand are pulverized to 60 orders for subsequent use;

[0041] (5) Mix corn cob and corn stalk powder, sodium alginate, water, sponge iron 2, attapulgite and citric acid evenly, and gradually put them into the granulator, start the granulator, spray water gradually, and roll to the ball type. The composition and mass percentage of the core material are as follows: 30% mixture of corn cob and corn stalk, 2% sodium alginate, 37% water, 15% s...

Embodiment 2

[0047] In this example, the preparation process of the slow-release carbon source filler used for the in-situ repair of the carbon-iron micro-battery in polluted groundwater is:

[0048] (1) Soak the peanut shell of the core 4 material in a hydrogen peroxide solution accounting for 5% (mass percentage) of hydrogen peroxide for 10 hours, take it out, rinse it with clean water for 3 times, and dry it for 7 days for later use;

[0049] (2) The natural carbon source material 1 obtained in step (1) is crushed to 50 mesh for subsequent use;

[0050] (3) Sponge iron is crushed to 90 orders for subsequent use;

[0051] (4) Diatomite and quartz sand are pulverized to 40 orders for subsequent use;

[0052] (5) Peanut shell powder, gum arabic, iron sponge, attapulgite and sodium bicarbonate are mixed evenly, and the composition and mass percentage of inner core 4 are as follows respectively: peanut shell 35%, gum arabic 4%, attapulgite 10%, sponge Iron 16%, sodium bicarbonate 5% and wa...

Embodiment 3

[0059] In this example, the preparation process of the slow-release carbon source filler used for the in-situ repair of the carbon-iron micro-battery in polluted groundwater is:

[0060] (1) Soak the core material walnut shell in a hydrogen peroxide solution with 5% (mass percentage) hydrogen peroxide for 12 hours, take it out, rinse it with clean water for 3 times, and dry it for 6 days for later use.

[0061] (2) Crush the natural carbon source material 1 obtained in step (1) to 40 mesh, and set aside.

[0062] (3) Sponge iron 2 is pulverized to 100 mesh and set aside.

[0063] (4) Diatomite and quartz sand are pulverized to 50 orders for subsequent use;

[0064] (5) 10 g of PVA with a degree of alcoholysis of 89% is placed in 90 mL of water, dissolved in water at 60 to 70 ° C and stirred for 20 to 30 min, and the 10% PVA (polyvinyl alcohol) solution is set aside;

[0065] The components of the inner core and the mass percentages of each component are: walnut shell 25%, 10...

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Abstract

The invention discloses a carbon-iron microbattery slow-release carbon source filler and a preparation method thereof, belonging to the field of restoration of underground water pollution. The carbon-iron microbattery slow-release carbon source filler is composed of an inner core and an outer shell, wherein the inner core is made from organic carbon source mixed materials, and the outer shell is prepared from cement and high-permeability raw materials. The inner core is prepared from the following components in percentage by mass: 25-40% of natural carbon source material, 2-5% of adhesive, 20-37% of water, 15-25% of spongy iron, 10-15% of attapulgite and 2-6% of pH regulator; and the outer shell is prepared from the following components in percentage by mass: 45-53% of attapulgite, 22-25% of kieselguhr, 22-25% of ordinary Portland cement and 3-5% of water. By using the filler and method, the particle strength of the inner core can be enhanced to 70-105N / particle, and the thickness of the slow-release outer shell is lowered to 1-1.5 mm, so that the carbon-iron can be uniformly distributed in the material.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration, and more specifically relates to a slow-release carbon source filler and a preparation method thereof. Background technique [0002] When carbon and iron are immersed in the electrolyte solution, due to the electrode potential difference of 1.2V between Fe and C, the carbon source and the sponge iron are fully and uniformly contacted to form countless micro-battery systems, forming an electric field in their action space, which acts to break Ring scission, reduce nitrate, remove color and improve biodegradability. The new ecological ferrous ions produced by the anode reaction have strong reducing ability and can reduce nitrate. In addition, divalent and ferric ions are good flocculants, especially the newly born ferric ions have higher flocculation and adsorption activity. Adjusting the pH of the water body can make the iron ions become hydroxide flocculent precipitation, adsorbi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
Inventor 张雯阮晓红朱晓明尹琳陈欢
Owner NANJING UNIV
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