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Synchronous nitrogen and chromium removal light material, and preparation method and application thereof

A lightweight material, denitrification technology, applied in chemical instruments and methods, other chemical processes, water/sewage multi-stage treatment, etc. question

Active Publication Date: 2021-10-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent CN201510342628.4, the preparation of a modified activated carbon adsorbent for removing hexavalent chromium is disclosed. This scheme uses activated carbon adsorbent to treat chromium-containing wastewater, but its adsorption effect is not ideal, resulting in chromium in the activated carbon carrier. It still exists in the form of large-sized particles, and the amount of chromium adsorbed at one time is too small, which greatly reduces the utilization rate of activated carbon adsorbent and increases the cost of chromium removal

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  • Synchronous nitrogen and chromium removal light material, and preparation method and application thereof
  • Synchronous nitrogen and chromium removal light material, and preparation method and application thereof
  • Synchronous nitrogen and chromium removal light material, and preparation method and application thereof

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preparation example Construction

[0037] The present invention also provides a method for preparing a lightweight material for synchronous denitrification and chromium removal described in the above technical solution, comprising the following steps:

[0038] Mix ferric oxide powder, carbon fiber powder, starch and water, and heat to obtain a molten mixture;

[0039] Sulfur powder is subjected to low-temperature melting and high-temperature gasification in sequence to obtain high-temperature sulfur vapor;

[0040] mixing the molten mixture with high-temperature sulfur vapor to obtain a porous composite material;

[0041] The porous composite material is granulated into balls to obtain a lightweight material for synchronous denitrification and chromium removal.

[0042] In the present invention, ferric iron tetroxide powder, carbon fiber powder, starch and water are mixed and heated to obtain a molten mixture. In the present invention, the added mass of the water is preferably 30-40% of the total mass of the ...

Embodiment 1

[0062] Ferric oxide powder is a powder with an average particle size of 45 microns;

[0063] Sulfur powder is a very fine powder between 300 mesh and 400 mesh;

[0064] Carbon fiber powder is a phenolic-based activated carbon fiber powder with an average particle size of 30 microns;

[0065] In terms of mass percentage, 45% of ferric oxide powder, 40% of sulfur powder, 10% of carbon fiber powder and 5% of starch are used as raw materials to prepare a lightweight material for simultaneous denitrification and chromium removal:

[0066] Mix ferric oxide powder and carbon fiber powder, add water and starch, and mix uniformly to obtain a mixture; the added mass of the water is 30% of the total mass of ferric oxide powder, carbon fiber powder and starch;

[0067] heating the mixture to a viscous state at 120°C to obtain a molten mixture;

[0068] Slowly add sulfur powder from the top to the bottom through a non-fixed fluidized bed. First, the sulfur powder is melted at a low tempe...

Embodiment 2

[0079] Ferric oxide powder is a powder with an average particle size of 45 microns;

[0080] Sulfur powder is a very fine powder between 300 mesh and 400 mesh;

[0081] Carbon fiber powder is a phenolic-based activated carbon fiber powder with an average particle size of 40 microns;

[0082] In terms of mass percentage, 45% of ferric oxide powder, 35% of sulfur powder, 15% of carbon fiber powder and 5% of starch are used as raw materials to prepare a lightweight material for simultaneous denitrification and chromium removal:

[0083] Mix ferric oxide powder and carbon fiber powder, add water and starch, and mix evenly to obtain a mixture; the added mass of the water is 40% of the total mass of ferric oxide powder, carbon fiber powder and starch;

[0084] heating the mixture to a viscous state at 120°C to obtain a molten mixture;

[0085] Slowly add sulfur powder from the top to the bottom through a non-fixed fluidized bed. First, the sulfur powder is melted at a low temperat...

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Abstract

The invention provides a synchronous nitrogen and chromium removal light material, and a preparation method and application thereof, and relates to the technical field of wastewater treatment. The synchronous nitrogen and chromium removal light material is prepared from, by mass, 45 to 50 percent of ferroferric oxide powder, 35 to 40 percent of sulfur powder, 10 to 15 percent of carbon fiber powder and 1 to 10 percent of starch. The synchronous nitrogen and chromium removal light material provided by the invention is small in particle size, high in strength, high in porosity and large in specific surface area, has the advantages of high nitrogen removal efficiency, good chromium adsorption effect and low cost, and is suitable for treating leather wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a lightweight material for synchronous denitrification and chromium removal, a preparation method and application thereof. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, a large amount of nutrient nitrogen enters the leather wastewater, resulting in serious eutrophication of the water body. At the same time, due to the development of electroplating, metal processing, tanning, paint, pigment, printing and dyeing and other industries, while promoting economic growth, a large amount of chromium-containing wastewater is also produced. In many cases, it is difficult for leather wastewater to meet the national Class A discharge standard after secondary treatment. Even if the drainage standard is met, for the eutrophic water body, more stringent denitrification treatment is required to ensure the ecolo...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/26B01J20/20B01J20/30C02F9/14C02F101/22C02F101/16C02F103/24
CPCB01J20/06B01J20/26B01J20/20C02F1/285C02F3/28C02F3/34C02F2101/16C02F2101/22C02F2103/24
Inventor 刘波柳聪王梦良张陈永周立松史航隆添翼
Owner NANJING UNIV
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