Method for preparing haydite from urban sewage plant sludge

A technology of urban sewage and dewatered sludge, applied in the environmental field, can solve the problems of large capacity, instability, and easy corruption, and achieve the effect of large specific surface area and low water absorption rate

Inactive Publication Date: 2008-03-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of sludge produced every day is about 0.5%-1.0% of the sewage treatment volume. In addition to rich nutrients such as nitrogen and phosphorus, the sludge also contains a large amount of organic matter, heavy metals and various pathogenic microorganisms. Large, perishable, unstable, and foul-smelling, if not properly treated, it will cause

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh 20g, 30g, and 10g of dewatered sludge, fly ash, and clay from urban sewage plants after drying and crushing, put them in a beaker, stir well, then add water and stir until it becomes viscous, and then make raw material ball;

[0017] (2) Put the raw material balls into an electric heating constant temperature blast drying oven and dry at 105°C for 1 hour;

[0018] (3) Put the raw material balls into the box-type resistance furnace and heat up to 200°C, and the preheating time is 10 minutes; continue to heat up to 1100°C in the box-type resistance furnace, and roast for 5 minutes; naturally cool to room temperature, and obtain ceramsite.

[0019] Its appearance is yellow or brown spherical solid, and its bulk density is 650-750kg / m 3 , particle density is 1050-1150kg / m 3 , the water absorption rate is 5.80-10.8%, and the specific surface area is 2.29-5.56m 2 / g.

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PUM

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Abstract

The present invention discloses one kind of haydite produced with dewatered sludge, fly ash and clay as material and its production process, and belongs to the field of environment technology. The haydite is produced dewatered sludge, fly ash and clay as material, and through mixing and sintering at gradually raised temperature. It is yellow or brown spherical solid in the bulk specific weight of 650-750 kg/cu m, granular specific weight of 1050-1150 kg/cu m, water absorption of 5.80-10.8 %, and specific surface area of 2.29-5.56 sq m/g. The production process is simple and low in cost, and the haydite has light weight, high strength, small water absorption, great specific surface area and other features. The haydite has wide use in building, environment protection, metallurgy, chemical industry, and other industry.

Description

(1) Technical field [0001] The invention relates to a method for preparing ceramsite from urban sewage plant sludge, which belongs to the field of environmental technology. (2) Background technology [0002] Sewage plant sludge refers to the flocs produced in the process of water treatment. It contains a large amount of water, rich organic matter and nutrients such as N, P, and K. It also contains harmful substances such as heavy metals and pathogenic bacteria. If it is discharged arbitrarily without treatment , not only pollute the environment, but also a serious waste of resources. According to incomplete statistics, the national sewage discharge is 4.474×107m 3 / d, there are more than 100 sewage treatment plants of different scales and treatment levels. The amount of sludge produced every day is about 0.5%-1.0% of the sewage treatment volume. In addition to rich nutrients such as nitrogen and phosphorus, the sludge also contains a large amount of organic matter, heavy m...

Claims

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Application Information

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IPC IPC(8): C04B33/13C04B33/132C04B33/32
CPCY02P40/60
Inventor 岳钦艳李仁波高宝玉岳敏解建坤
Owner SHANDONG UNIV
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