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Preparation method of sludge absorber and applications thereof

A sludge adsorption and sludge technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of arsenic pollution control and removal in water phase without sludge adsorbent , to achieve the effect of resource utilization, low cost and easy operation

Inactive Publication Date: 2009-10-21
TONGJI UNIV
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Problems solved by technology

[0003] So far, there are no research reports on the preparation of sludge adsorbents using sodium bicarbonate as a chemical activation reagent and its application in the treatment and removal of arsenic pollution in water phase at home and abroad.

Method used

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  • Preparation method of sludge absorber and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take the dewatered sludge from the urban sewage treatment plant, put it in a cool and dry place for 15 days, air-dry it, pass it through a 60-mesh sieve after grinding, put the sieved dry sludge in a tubular resistance furnace, and pass it through a nitrogen atmosphere for 30 minutes The heating time is specified, pyrolyzed at 500°C for 30 minutes, and then cooled to room temperature to obtain the first pyrolysis product of sludge.

[0023] (2) Mix the first pyrolysis product of the sludge with industrial-grade solid sodium bicarbonate, the mass ratio of the sodium bicarbonate and the first pyrolysis product of the sludge is 0.5:1, and stir evenly. The above solid mixture was placed in a tube-type resistance furnace again, and after a heating time of 30 minutes in a nitrogen atmosphere, it was pyrolyzed at 800° C. for 30 minutes, and cooled to room temperature to obtain the second pyrolysis product of sludge.

[0024] (3) Firstly, the second pyrolysis product of the...

Embodiment 2

[0027] (1) Take the dewatered sludge from the urban sewage treatment plant, put it in a cool and dry place for 15 days to air-dry, pass through a 60-mesh sieve after grinding, and place the sieved dry sludge in a tubular resistance furnace for 120 minutes in a nitrogen atmosphere Pyrolysis at 600°C for 30 minutes, and then cooled to room temperature to obtain the first pyrolysis product of sludge.

[0028] (2) Mix the first pyrolysis product of the sludge with industrial-grade solid sodium bicarbonate, the mass ratio of the sodium bicarbonate and the first pyrolysis product of the sludge is 1:1, and stir evenly. The above solid mixture was placed in a tube-type resistance furnace again, and after a heating time of 120 minutes in a nitrogen atmosphere, it was pyrolyzed at 650° C. for 120 minutes, and cooled to room temperature to obtain the second pyrolysis product of sludge.

[0029] (3) Firstly, the second pyrolysis product of the sludge is washed with water, and the solid ph...

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Abstract

The invention belongs to the technical field of sludge recycling treatment in solid and waste treatment, in particular to a preparation method of a sludge absorber and applications thereof. The technical steps are as follows: firstly carrying out first thermolysis in the protective gas atmosphere under the temperature of 400 to 600 DEG C; then adding solid sodium bicarbonate for mixing evenly into the products from the first sludge thermolysis with the mass ratio range of the sodium bicarbonate and the sludge of 0.1 to 3; carrying out second thermolysis to solid mixture in the nitrogen atmosphere under the temperature of 400 to 800 DEG C; then carrying out cleaning and drying to the mixture from the second thermolysis with water and diluted acid respectively; and finally obtaining the product of sludge absorber. The absorber has good effect when being applied to absorption and removal of heavy metal and pentavalent arsenic in water. The invention realizes recycling utilization of sludge, namely, solid waste, and the prepared product is application to treatment of water polluted by arsenic, therefore, the invention has the advantages of high utilization rate and low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of sludge resource treatment in solid waste treatment, and in particular relates to a preparation method and application of a sludge adsorbent. Background technique [0002] With the improvement of environmental standards and the development of sludge treatment technology in recent years, the view that sludge is a valuable resource has been widely accepted, and the ways of sludge resource utilization have attracted much attention. Due to its high carbon content, sludge can be prepared into a carbon-containing adsorbent with certain adsorption capacity by physical activation or chemical activation under certain conditions. Usually, the pollution of physical activation method will be relatively small, but the performance of the prepared carbon-containing adsorbent is relatively poor, no matter in terms of specific surface area, pore size distribution, or pore volume distribution, or from the effect of its prac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30C02F9/04C02F1/28C02F1/66
Inventor 朱志良张华李玲仇雁翎陈玲赵建夫
Owner TONGJI UNIV
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