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Sludge drying treatment method

A treatment method, sludge drying technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., to achieve the effects of low price, easy industrialization, and sufficient sources of additives

Inactive Publication Date: 2010-04-28
浙江清园生态热电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is basically aimed at the sludge produced by urban sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Put 400kg of papermaking sludge into the mixing tank, add 5L of 0.45wt.% polyacrylamide solution (polyacrylamide 22.5g), 6kg of sawdust and 0.2kg of slaked lime powder, stir well and let stand for 20 minutes, then use a pneumatic diaphragm pump Pump the material after static treatment into the filter under the condition that the feeding pressure is 0.3-0.6 MPa, and the material delivery is completed after 1 hour. Turn on the booster pump, and gradually increase the pressure of the filter according to the water flow at the outlet of the filter. The pressure is 0.8-1.2MPa for 20 minutes, and finally the pressure is increased to 1.5MPa. Squeeze until the filter outlet is no longer When water flows out, the booster water pump is closed, and the pressing process ends, and the whole pressing process time is 30 minutes.

[0032] 55.5 kg of mud cake was obtained. After testing, the water content was 50.63%, the calorific value was 2251 Cal / g, the thickness of the mud cake was 30...

Embodiment 2

[0034] Put 400kg of papermaking sludge into the stirring tank, add 9L of 0.45wt.% polyacrylamide solution (polyacrylamide 40.5g), 5kg of sawdust and 0.35kg of slaked lime powder, stir well and let stand for 10 minutes, then use a pneumatic diaphragm pump Pump the material after static treatment into the filter under the condition that the feeding pressure is 0.3-0.6 MPa, and the material delivery is completed after 1 hour. Turn on the booster pump, and gradually increase the pressure of the filter according to the water flow at the outlet of the filter. The pressure is 0.8-1.2MPa for 20 minutes, and finally the pressure is increased to 1.5MPa. Squeeze until the filter outlet is no longer When water flows out, the booster water pump is closed, and the pressing process ends, and the whole pressing process time is 28 minutes.

[0035] Obtain 55kg of mud cake, after testing, its moisture content is 50.73%, calorific value is 2247Cal / g, and mud cake thickness is 30mm.

Embodiment 3

[0037] Put 400kg of papermaking sludge into the mixing tank, add 7L of 0.45wt.% polyacrylamide solution (polyacrylamide 31.5g), 6.3kg of sawdust and 0.3kg of slaked lime powder, stir well and let stand for 10 minutes, then use a pneumatic diaphragm The pump pumps the materials after static treatment into the filter under the condition of the feeding pressure of 0.3-0.6 MPa, and the materials are conveyed after 1 hour. Turn on the booster pump, and gradually increase the pressure of the filter according to the water flow at the outlet of the filter. The pressure is 0.8-1.2MPa and lasts for 22 minutes. Finally, the pressure increases to 1.5MPa. When water flows out, the booster water pump is closed, and the pressing process ends, and the whole pressing process time is 30 minutes.

[0038] Obtain 55.2kg of mud cake, after testing, its moisture content is 49.92%, calorific value is 2137Cal / g, and mud cake thickness is 30mm.

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Abstract

The invention belongs to the field of sludge treatment and discloses a sludge drying treatment method. The method comprises the following steps: adding 50-100 ppm polyacrylamide according to the mass of the sludge, adding 20-25% of sawdust according to the absolute dry mass of the sludge, and evenly stirring; and standing the obtained material for some time, sending the material into a filtering machine by a pneumatic diaphragm pump, and squeezing to obtain a sludge cake, wherein the sending pressure is 0.3-0.6 MPa, the pressure for squeezing gradually rises from 0 MPa to 1.5 MPa, and the squeezing is completed until no water flows out. The method of the invention has the characteristics of abundant sources and low price of the added material, simple operation and obvious dehydration effect; the water content of the dried sludge is about 50%; and the method does not have special requirements for production equipment, thereby being easy for industrial and large-scale treatment of sludge produced by paper making.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a drying treatment method for papermaking sludge. Background technique [0002] A large amount of sludge with high water content is produced in the waste paper and papermaking wastewater treatment process, and the water must be removed as much as possible before final disposal to increase the solid content and facilitate further treatment. After the wastewater is treated by physicochemical and biochemical methods, more than 90% of the suspended solids in it are separated and become sludge. Usually about 5% of waste paper enters the waste water, and 70-80kg of dry sludge is produced per ton of waste paper, which is equivalent to: the water content of air flotation sludge (precipitation concentrated sludge) is 97%, and the amount of sludge is about 2.3-2.6t / t paper; the moisture content of sludge after mechanical dehydration is about 75%, and the amount of dry sludge i...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 喻正其喻涛军喻峰军潘国钢俞丰
Owner 浙江清园生态热电有限公司
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