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A kind of sludge dehydration conditioner, preparation method and use method

A sludge dehydration and conditioning agent technology, applied in the field of environmental engineering, can solve the problems of high chemical cost, slow dehydration speed, dehydration effect, etc., and achieve the effect of avoiding secondary pollution, reducing specific impedance value, and good dehydration effect

Active Publication Date: 2017-09-26
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the deep dehydration methods of sludge at home and abroad mainly include natural drying, heat source drying, mechanical dehydration, etc. Among them, natural drying relies on infiltration and evaporation to reduce the moisture content of sludge, which occupies a large area and has a slow dehydration speed. , the moisture content of the sludge in 7 days is only reduced by about 20%. It is not only easily affected by rainfall, temperature, humidity, etc., but also has a strong smell. The treatment process of rapid evaporation of medium water, at present, the thermal energy drying equipment of sludge is mostly used as supporting facilities of waste incineration plants, and the heat energy generated by waste incineration is recycled to improve the utilization rate of heat energy. After drying, the moisture content of sludge is lower than 10%. It occupies less land and is easy to control, but the investment and operation costs are high, and the requirements for management and operation technology are also high; mechanical dehydration is to pretreat the sludge, improve the dehydration performance of the sludge and then use the equipment for dehydration. At present, the most The general pretreatment method is to add inorganic salt or polymer coagulant such as quicklime, active magnesium salt, aluminum salt, etc. The water content of the sludge after treatment is between 45% and 80%, and the effect is obvious, but the dehydration effect depends on the admixture Therefore, finding a sludge dehydration conditioner with a wide source of raw materials, low cost and good effect is the focus of current research on sludge reduction, harmlessness and resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The sludge dehydration conditioner of this embodiment is composed of carbide slag, marble slag, carbide and solidified sludge, and the components are in mass ratio, calcium carbide slag: marble slag: carbide: solidified sludge = 5:3:3:5; Among them, Ca(OH) of carbide slag 2 The grade is 62%, the particle size is ≦100 mesh; the marble slag particle size is ≦100 mesh; the carbide is crop carbide or sawdust carbide, the particle size is ≦100 mesh; the solidified sludge particle size is ≦2mm.

[0027] Calcium carbide slag contains 65% calcium oxide, 6% quartz, 2% magnesium oxide, 0.5% aluminum oxide, and 1% ferric oxide; marble slag contains 50% calcium carbonate, 50% quartz 8%, alumina 15%; the solidified sludge contains 28% organic matter, 10% quartz, 5% alumina, and 3% calcium carbonate.

[0028] The preparation method of the sludge dehydration conditioner of the present embodiment comprises the following steps:

[0029] Step 1: Carbide slag and marble slag are washed ...

Embodiment 2

[0037] The sludge dehydration conditioner of this embodiment is composed of carbide slag, marble slag, carbide and solidified sludge, and the components are in mass ratio, calcium carbide slag: marble slag: carbide: solidified sludge = 6:4:3:5; Among them, Ca(OH) of carbide slag 2The grade is 72%, the particle size is ≦100 mesh; the marble slag particle size is ≦100 mesh; the carbide is crop carbide or sawdust carbide, the particle size is ≦100 mesh; the solidified sludge particle size is ≦2mm.

[0038] Calcium carbide slag contains 75% of calcium oxide, 15% of quartz, 5% of magnesium oxide, 1% of aluminum oxide, 3% of ferric oxide; marble slag contains 70% of calcium carbonate, 70% of quartz 12%, alumina 25%; the solidified sludge contains 46% organic matter, 20% quartz, 12% alumina and 7% calcium carbonate.

[0039] The preparation method of the sludge dehydration conditioner of the present embodiment comprises the following steps:

[0040] Step 1. After the calcium carbid...

Embodiment 3

[0048] The sludge dehydration conditioner of this embodiment is composed of carbide slag, marble slag, carbide and solidified sludge, and the components are in mass ratio, calcium carbide slag: marble slag: carbide: solidified sludge = 6:4:4:6; Among them, Ca(OH) of carbide slag 2 The grade is 65%, the particle size is ≦100 mesh; the marble slag particle size is ≦100 mesh; the carbide is crop carbide or sawdust carbide, the particle size is ≦100 mesh; the solidified sludge particle size is ≦2mm.

[0049] Calcium carbide slag contains 70% of calcium oxide, 8% of quartz, 3% of magnesium oxide, 0.8% of aluminum oxide, and 2% of ferric oxide. Marble slag contains 60% of calcium carbonate, 60% of quartz 9%, alumina 19%; the solidified sludge contains 33% organic matter, 17% quartz, 8% alumina, and 4% calcium carbonate.

[0050] The preparation method of the sludge dehydration conditioner of the present embodiment comprises the following steps:

[0051] Step 1. After the calcium c...

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Abstract

A sludge dehydration conditioner, preparation method and use method, belonging to the technical field of environmental engineering, in the sludge dehydration conditioner, calcium carbide slag: marble slag: carbide: solidified sludge is (4-6) by mass percentage : (2~4): (2~4): (4~6) formed after mixing, and its preparation method includes: respectively crushing and ball milling calcium carbide slag, marble slag, carbide and solidified sludge Then mix evenly in proportion. The method of using the sludge dewatering conditioner includes: mixing the sludge and the sludge dewatering conditioner evenly at a mass ratio of 1: (0.05-0.1), and dehydrating the sludge mixture after standing for 1 day. After dehydration, the moisture content of the sludge is lower than 50%, pH between 5 and 10. The method has the advantages of low cost, simple operation, and obvious dehydration effect. The raw material of the conditioning agent has a wide range of sources, and it is easy to fully mix with the sludge, which can effectively increase the combustion calorific value of the sludge. The sludge treated by the method of the present invention can be recycled, realizing The harmless, reduction and resource utilization of sludge have been achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a sludge dehydration conditioner, a preparation method and a use method. Background technique [0002] At present, the methods of sludge treatment and disposal mainly include incineration, composting for agricultural use, land sanitary landfill, production of building materials, ocean treatment, etc. Among them, sludge incineration and landfill are the best ways to realize the reduction, harmlessness and resource utilization of sludge. The main disposal method is an ideal method in sludge disposal at the present stage, which can meet more and more stringent environmental requirements. Sludge incineration is the most thorough disposal method. After incineration, the volume of sludge is reduced by 85% to 95%, and the quality is reduced by 70% to 80%. Part of the sludge suitable for resource utilization; sludge landfill is a relatively mature technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14
CPCC02F11/14C02F2303/06
Inventor 王华庆张树光金佳旭
Owner LIAONING TECHNICAL UNIVERSITY
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