Coconut shell-mud composite active carbon as well as preparation method and application thereof

A composite activated carbon and coconut shell technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of low micropore ratio and small specific surface area, and achieve developed pores and specific surface area Large, high adsorption value effect

Inactive Publication Date: 2018-05-15
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sludge activated carbon prepared in the prior art has the problems of small specific surface area and low proportion of micropores

Method used

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  • Coconut shell-mud composite active carbon as well as preparation method and application thereof
  • Coconut shell-mud composite active carbon as well as preparation method and application thereof
  • Coconut shell-mud composite active carbon as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0026] The invention provides a kind of preparation method of coconut shell-sludge composite activated carbon, comprises the following steps:

[0027] (1) drying and crushing the remaining sludge from urban sewage treatment in sequence to obtain sludge particles;

[0028] (2) the sludge granules obtained in the step (1) are mixed with coconut shell granules to obtain a granule mixture;

[0029] (3) carbonizing the particle mixture obtained in the step (2) to obtain a carbonized product;

[0030] (4) drying the carbonized product, potassium hydroxide and water obtained in the step (3) to obtain an intermediate product;

[0031] (5) carbonizing and activating the intermediate product obtained in the step (4) to obtain activated carbide;

[0032] (6) The activated carbon obtained in the step (5) is washed successively with hydrochloric acid and water to obtain coconut shell-sludge composite activated carbon.

[0033] The invention sequentially dries and pulverizes the excess s...

Embodiment 1

[0062] Send the remaining sludge from urban sewage treatment plants with a moisture content of more than 85% into an oven to dry until the moisture content is lower than 10% to obtain dry sludge; grind the dry sludge and coconut shells separately, and sieve through 50 meshes to obtain a particle size not exceeding For 0.3mm sludge particles and coconut shell particles, weigh 10g of dry sludge and 10g of coconut shell particles according to the mass ratio of 1:1, and mix them evenly. The rest of the preparation methods are the same as in Example 1 to prepare coconut shell-sludge activated carbon.

[0063] figure 1 The SEM image of the coconut shell-sludge composite activated carbon that the conventional sludge activated carbon that comparative example of the present invention makes and embodiment 1 make; figure 2 The BET image (test condition: analysis temperature 77.350K, adsorption and desorption time 6 hours) of the coconut shell-sludge composite activated carbon that the ...

Embodiment 2

[0065] (1) Send the remaining sludge of urban sewage treatment plants with a water content of more than 85% into an oven to dry until the water content is lower than 10% to obtain dry sludge; crush the dry sludge and coconut shells separately, and sieve through 50 meshes to obtain granules For sludge particles and coconut shell particles with a diameter not exceeding 0.3mm, weigh 10g of dry sludge and 10g of coconut shell particles according to the mass ratio of 1:1, and mix them evenly.

[0066] (2) Send the above sludge particles into a box-type resistance furnace, carbonize and activate at a temperature of 500° C. for 45 minutes, and control the heating rate at 35° C. / min to obtain carbonized products.

[0067] (3) Add the charred product obtained in step 2 into the potassium hydroxide solution and stir evenly, the concentration of potassium hydroxide is 2mol / L, and the impregnation ratio is 1:1.5 (mass ratio, W solid: W potassium hydroxide=1: 1.5, the same below), immerse ...

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Abstract

The invention provides a preparation method of coconut shell-mud composite active carbon, and belongs to the field of waste water treatment. A two-step chemical activation method is adopted to transform residual sludge coming from urban sewage treatment into the coconut shell-mud composite active carbon having economical value, so that the residual sludge of urban sewage treatment plants is recycled, and stabilization, reduction, hazard-free treatment and recycling of the sludge are realized. The method has the characteristics of simple process and low cost, and the prepared coconut shell-mudcomposite active carbon product has the characteristics of rich pores and high adsorption performance. Coconut shell is doped into the sludge to prepare the coconut shell-mud composite active carbon,so that the carbon content of raw materials is increased, and the defects of lower carbon content of the raw materials mud and higher ash content are overcome. The coconut shell-mud composite active carbon prepared with the method has the advantages of larger specific-surface area, high adsorption value and good adsorption effects on hexavalent chromium and dyes in a water body, and is suitable for being popularized in the field of water treatment.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a coconut shell-sludge composite activated carbon and a preparation method and application thereof. Background technique [0002] Surplus sludge is the main waste produced by urban sewage treatment plants. Sludge has a high water content, is easy to corrupt and produces stench, and contains organic matter, heavy metals, salts and various pathogenic microorganisms. With the development of related technologies of "paying equal attention to cement", the recycling, harmless and reduction disposal of sludge has become an environmental issue that the society pays more and more attention to. Many studies have confirmed that the use of sludge activated carbon to make adsorbents has great application prospects, so it has attracted widespread attention. [0003] At present, the research on the application of sludge activated carbon focuses on the treatment of dyes and metal i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C01P2002/80C01P2004/03C01P2006/12C01P2006/14C01P2006/16C02F1/283C02F2101/20
Inventor 刘宇程刘骞陈明燕梁庆玲肖琴刘炬
Owner SOUTHWEST PETROLEUM UNIV
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