Novel sludge dehydrating agent

A sludge dehydrating agent, a new type of technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of environmental secondary pollution, environmental pollution, refractory degradation, etc., achieve small environmental pollution and overcome excessive dosing , easy dehydration effect

Inactive Publication Date: 2015-08-12
唐国萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used sludge dewatering agent is cationic polyacrylamide (CPAM). Although CPAM has a good sludge dewatering effect, its shortcomings of being used as a sludge dewatering agent in large quantities are increasingly apparent. It is difficult to degrade, causing secondary pollution to the environment, and a large amount of organic solvents such as surfactants used in the synthesis of CPAM will also pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Preparation and dehydration

[0041] Take 32 kg of polyaluminum chloride, 28 kg of iron sulfate, 15 kg of calcium oxide, 12 kg of bentonite, 8 kg of starch, and 5 kg of polyacrylamide. After fully mixing, dry them at 80-100°C for 20-40 minutes to prepare a sludge dehydrating agent. .

[0042] The sludge dehydrating agent prepared by the above method is applied to the remaining sludge of a municipal sewage plant, and the water content of the sludge is 98.5%. The method is as follows: add the new sludge dewatering agent prepared above to the sludge, the adding amount is 0.8% of the wet weight of the sludge, and the mixture is stirred for 3-5 minutes to obtain the coagulated sludge. The frame filter press performs positive pressure dehydration, the holding pressure is 1.6Mpa, the holding time is 30min, the pressure is relieved and the material is discharged, and the moisture content of the sludge after dehydration is 48.4%.

Embodiment 2

[0043] Example 2: Preparation and dehydration

[0044] Take 35kg of polyaluminum chloride, 25kg of ferric sulfate, 18kg of calcium oxide, 10kg of bentonite, 9kg of starch and 3kg of polyacrylamide, and then dry them at 80-100℃ for 20-40 minutes to prepare sludge dehydrating agent. .

[0045] The sludge dehydrating agent prepared by the above method is applied to the surplus sludge of a sewage treatment in a pharmaceutical factory, and the water content of the sludge is 97.8%. The method is as follows: add the new sludge dewatering agent prepared above to the sludge, the addition amount is 0.6% of the wet weight of the sludge mass, and the mixture is stirred for 3-5 minutes to obtain coagulated sludge. The filter press performs positive pressure dehydration, the holding pressure is 1.8Mpa, the holding time is 20 minutes, and the pressure is relieved and the sludge moisture content is 45.7%.

Embodiment 3

[0046] Example 3: Preparation and dehydration

[0047] Take 38kg of polyaluminum chloride, 24kg of iron sulfate, 12kg of calcium oxide, 15kg of bentonite, 6kg of starch and 5kg of polyacrylamide, and then dry them at 80-100℃ for 20-40 minutes to make a sludge dehydrating agent. .

[0048] The sludge dehydrating agent prepared by the above method is applied to the surplus sludge of a chemical plant's sewage treatment, and the water content of the sludge is 97.5%. The method is as follows: add the new sludge dewatering agent prepared above to the sludge, the adding amount is 0.5% of the wet weight of the sludge, and stirring for 3-5 minutes to obtain the coagulated sludge, and the above-mentioned coagulated sludge with belt The water content of the sludge after dehydration is 49.3%.

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PUM

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Abstract

The present invention discloses a novel sludge dehydrating agent, a preparation method and applications thereof, and belongs to the sludge treatment field, wherein poly aluminium chloride, calcium oxide, ferric sulfate, bentonite, starch, and polyacrylamide are mixed according to a certain ratio, and then drying is performed for 20-40 min at a temperature of 80-100 DEG C to prepare the novel sludge dehydrating agent. According to the present invention, the novel sludge dehydrating agent has the good dehydrating effect, the water content of the dehydrated sludge is 40-50%, the polyacrylamide content is low, the environmental pollution is low, the preparation process is simple, the cost is low, and the novel sludge dehydrating agent is suitable for large-scale sludge dehydrating treatment.

Description

Technical field [0001] The invention relates to the preparation and application of a sludge dewatering agent, in particular to a novel sludge dewatering agent and a preparation method and application thereof, belonging to the field of sludge treatment. Background technique [0002] The sludge usually contains a large amount of water, and the moisture content is as high as 97.5%-99.5%, resulting in a very large volume of the sludge, which brings great difficulties to the subsequent treatment process and transportation and greatly increases the treatment cost. The sludge must be dehydrated to reduce the volume of sludge. At present, the commonly used method is to use one or several chemical agents to condition the sludge, thereby changing the properties of the sludge particles and facilitating the removal of moisture in the sludge. At present, the most commonly used sludge dewatering agent is cationic polyacrylamide (CPAM). Although CPAM has a good sludge dewatering effect, its la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 不公告发明人
Owner 唐国萍
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