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High-efficiency slow-release carbon source modified corn cob, preparation method and application thereof

A slow-release carbon source and corn cob technology, which is applied in chemical instruments and methods, water treatment of special compounds, sustainable biological treatment, etc., can solve the problem of unstable release rate of slow-release carbon source, and achieve low quality loss and easier Effect of contact and promotion of decomposition

Inactive Publication Date: 2018-12-14
JIANGSU LONG LEAPING ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to solve the problem of unstable release rate of natural solid slow-release carbon sources, through modification treatment and optimization of modification conditions, to prepare an economical, efficient and stable slow-release carbon source material to improve sewage treatment Medium Denitrification and Nitrogen Removal Efficiency

Method used

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  • High-efficiency slow-release carbon source modified corn cob, preparation method and application thereof
  • High-efficiency slow-release carbon source modified corn cob, preparation method and application thereof
  • High-efficiency slow-release carbon source modified corn cob, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0026] Step 1: Grinding and sieving the corncobs in a pulverizer to obtain samples with a required particle size of about 12 mm, washing them and placing them in natural conditions to air-dry for later use;

[0027] Step 2, taking 8 parts of corncobs and 90 parts of a mixed solution containing 1v / v% hydrogen peroxide and 3w / v% sodium hydroxide, and bathing in a constant temperature water bath at 95-100°C for 4 hours;

[0028] Step 3: Cool the reaction solution in Step 2 to room temperature, wash, neutralize and centrifuge in a low-speed centrifuge at 1800 rpm for 3 minutes, and dry at low temperature to constant weight to obtain a slow-release carbon source. Depend on figure 1 and figure 2 It can be seen from the comparison that the cellulose structure of the untreated corncob structure is dense, and the cellulose, hemicellulose and lignin are cross-linked together. This high degree of cross-linking greatly reduces the contact degree of cellulose and cellulase; After modifi...

Embodiment 2

[0030] Step 1: Grinding and sieving the corncobs in a pulverizer to obtain samples with a required particle size of 9-10 mm, washing them and placing them in natural conditions to air-dry for later use;

[0031] Step 2, take 10 parts of corncobs and 80 parts of a mixed solution containing 1v / v% hydrogen peroxide and 2w / v% sodium hydroxide, and bathe in a constant temperature water bath at 90°C for 2 hours;

[0032] Step 3: Cool the reaction solution in Step 2 to room temperature, wash it, and centrifuge it in a low-speed centrifuge at 1500 rpm for 5 minutes after neutralization, and dry it to a constant weight at low temperature to obtain a slow-release carbon source. The prepared high-efficiency slow-release The degree of cross-linking among the modified corn cob fibers by releasing carbon sources is reduced, the structure is loose and porous, the porosity and pore size are increased, most of the lignin and part of the cellulose are removed, and the lattice structure between t...

Embodiment 3

[0034] Step 1: Grinding and sieving the corncobs in a pulverizer to obtain samples with a required particle size of 12-15 mm, washing them and placing them in a natural condition to air-dry for later use;

[0035] Step 2, taking 9 parts of corncobs and 85 parts of a mixed solution containing 2v / v% hydrogen peroxide and 1.5w / v% sodium hydroxide, and bathing in a constant temperature water bath at 98-100°C for 2.5 hours;

[0036] Step 3: Cool the reaction solution in step 2 to room temperature, wash it, and centrifuge it in a low-speed centrifuge at 1200 rpm for 10 minutes after neutralization, and dry it at low temperature to constant weight to obtain a slow-release carbon source. The prepared high-efficiency slow The degree of cross-linking among the modified corn cob fibers by releasing carbon sources is reduced, the structure is loose and porous, the porosity and pore size are increased, most of the lignin and part of the cellulose are removed, and the lattice structure betwe...

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Abstract

The invention belongs to the field of sewage treatment, and discloses a high-efficiency slow-release carbon source modified corn cob, a preparation method and application thereof, wherein a slow-release carbon source is prepared by modifying 8-10 parts by weight of corn cob with 80-90 parts by weight of alkaline hydrogen peroxide, and the preparation method is simple and quick, low in cost, and good in treatment effect. The prepared high-efficiency slow-release carbon source modified corn cob is loose in structure and increased in surface area, has a porous structure, and has a particle diameter of 8-12 mm and a density of 0.3-0.6 g / cm<3>; when the high-efficiency slow-release carbon source modified corn cob is applied to denitrification biofilters, the removal rate of nitrate nitrogen isas high as 90% or more than 90%.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment fillers, and in particular relates to a slow-release carbon source-modified corn cob with high economical efficiency and stable carbon source release rate, a preparation method and application. Background technique [0002] The effluent of urban sewage plants requires a low C / N ratio, and the deep denitrification process often requires additional carbon sources. The external carbon sources in the biological denitrification process include liquid carbon sources and solid slow-release carbon sources. Liquid carbon sources, such as high cost and serious secondary pollution problems, solid slow-release carbon sources can be used as electron donors for biological denitrification and carriers for biofilm growth at the same time. Common solid slow-release carbon sources include natural cellulose substances And synthetic degradable polymers, where the high price of degradable polymers limits its ...

Claims

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Application Information

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IPC IPC(8): C02F3/10
CPCC02F3/105C02F2305/06Y02W10/10
Inventor 潘龙张瑞斌奚道国赵欣欣王乐阳张强黄金鑫祖白玉佘文娟赵旭明
Owner JIANGSU LONG LEAPING ENG DESIGN
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