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

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

Inactive Publication Date: 2014-04-16
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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Embodiment 1

[0035] In the present embodiment, the carbon-iron micro-battery slow-release carbon source filler used for groundwater pollution restoration, its preparation process is:

[0036] (1) Aerate the mixture of corn cob and corn stalk, which is the core 4 material, in ozone for 30 minutes, wash it twice with clean water, dry it for 5 days, and set aside;

[0037] (2) Crushing the natural carbon source material 1 obtained in step (1) to 60 mesh for later use;

[0038] (3) Sponge iron 2 is crushed to 80 mesh for later use;

[0039] (4) Diatomaceous earth and quartz sand are crushed to 60 mesh for later use;

[0040] (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: corn cob and corn stalk mixture 30%, sodium alginate 2%, water 37%, sp...

Embodiment 2

[0046] 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:

[0047] (1) Soak the kernel 4 material peanut shell in a hydrogen peroxide solution accounting for 5% (mass percentage) of hydrogen peroxide for 10 hours, take it out, rinse it with clean water 3 times, and dry it for 7 days for later use;

[0048] (2) Crush the natural carbon source material 1 obtained in step (1) to 50 mesh for later use;

[0049] (3) Crush the sponge iron to 90 mesh for later use;

[0050] (4) Diatomaceous earth and quartz sand are crushed to 40 mesh for later use;

[0051] (5) Mix peanut shell powder, gum arabic, iron sponge, attapulgite and sodium bicarbonate evenly, and the composition and mass percentage of core 4 are as follows: peanut shell 35%, gum arabic 4%, attapulgite 10%, sponge Iron 16%, sodium bicarbonate 5% and water 30%;

[0052] Add water to the granulator and ro...

Embodiment 3

[0058] 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:

[0059] (1) Soak the core material walnut shell in a hydrogen peroxide solution accounting for 5% (mass percentage) of hydrogen peroxide for 12 hours, take it out, rinse it with clean water 3 times, and dry it for 6 days for later use.

[0060] (2) Crush the natural carbon source material 1 obtained in step (1) to 40 mesh and set aside.

[0061] (3) Sponge iron 2 is crushed to 100 mesh and set aside.

[0062] (4) Diatomaceous earth and quartz sand are crushed to 50 mesh for later use;

[0063] (5) Put 10g of PVA with an alcoholysis degree of 89% in 90mL of water, dissolve in water at 60-70°C and stir for 20-30min, and use 10% PVA (polyvinyl alcohol) solution for later use;

[0064] The components of the inner core and the mass percentages of each component are: walnut shell 25%, 10% PVA solution 30%...

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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 Applications(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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