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Preparation method of waterworks sludge ceramsites for pretreating micro-polluted water

A technology of micro-polluted water and water supply sludge, applied in biological water/sewage treatment, water/sludge/sewage treatment, ceramic products, etc., can solve the problems of sludge recycling in water supply plants, and reach surface and internal micropores Effects of enrichment, protection of cultivated land, and rough surfaces

Active Publication Date: 2013-07-24
丁美华
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above problems existing in the prior art, and provides a preparation method of feedwater sludge ceramsite for pretreatment of slightly polluted water, which provides a good carrier for biological growth and biological pretreatment of slightly polluted water source water. Solve the problem of recycling sludge from water supply plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 80% dry sludge, 15% fly ash and 5% pore-forming agent rice husk powder.

Embodiment 2

[0023] Example 2: 70% dry sludge, 29% fly ash and 1% pore-forming agent rice husk powder.

Embodiment 3

[0024] Example 3: 75% dry sludge, 23% fly ash and 2% pore-forming agent rice husk powder.

[0025] Embodiment 1-3 concrete preparation steps are as follows:

[0026] (1) Drying and dehydration of raw materials: The dewatered sludge with a moisture content of 80wt% in the water supply plant is blast-dried at 105°C-110°C for 2 hours to obtain a water supply dry sludge with a moisture content of 52wt%.

[0027] (2) Crushing and screening of raw materials: crush the dry sludge and pore-forming agent dry rice husk obtained in step (1) with a pulverizer, pass through a 100-mesh electric sieve, and obtain dry sludge and rice husk powder with a particle size of less than 100 mesh .

[0028] (3) Mixing of raw materials: Stir and mix the dried sludge obtained in step (2), rice husk powder and fly ash in a mixing tank for 30 minutes to prepare a mixed material sample.

[0029] (4) Granulation: transfer the mixed material sample obtained in step (3) into a rotary disc granulator, add wa...

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PUM

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Abstract

The invention provides a preparation method of waterworks sludge ceramsites for pretreating micro-polluted water, belonging to the technical field of pretreatment of micro-polluted water. The method comprises the following steps of: uniformly mixing waterworks sludge serving as a major raw material with fly ash and a pore-forming agent in a certain mass ratio; adding a certain amount of water forpelletizing into balls in a ball forming mill; drying a spherical green stock, and performing continuous variable-temperature and constant-temperature baking; and naturally cooling and sieving to obtain finished ceramsites. In the method, waterworks sludge is fully utilized, and sludge is recycled; and moreover, a preparation process is simple, and cost is low. The ceramsites prepared with the method are provided with a plenty of micropores both on the surfaces and inside, and biofilm formation growth of microorganisms on the surfaces of the ceramsites is facilitated, so that the biological pretreating effect on water of a polluted water source is remarkably enhanced, and good social benefit and environmental protection benefit are achieved.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of slightly polluted water, and in particular relates to a preparation method of feedwater sludge ceramsite used for pretreatment of slightly polluted water. Background technique [0002] The use of biological pretreatment technology can effectively degrade dissolved organic matter and ammonia nitrogen pollution in slightly polluted water source water. At present, most of the biological pretreatment technology used to treat micro-polluted source water is carried out by biofilm method, and the core of biofilm method is to choose suitable filler as the carrier of biological growth. Although there are a variety of carriers, lightweight ceramsite is the most mature and commonly used at present. Conventional ceramsite is usually made of clay as the main raw material, but using clay as the main raw material will consume a lot of clay resources and destroy cultivated land. Moreover, clay resources ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C02F3/34C02F3/10
CPCY02W10/10
Inventor 丁磊罗刚张新喜汪明明
Owner 丁美华
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