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In-situ dewatering method for sludge of sewage treatment plants

A sewage treatment plant, in-situ dehydration technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., to achieve the effect of reducing water binding potential energy and improving physical and mechanical properties

Active Publication Date: 2013-01-09
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for tens of thousands or even hundreds of thousands of cubic meters of sludge, it is impossible to transport it into the dehydration equipment for deep dehydration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The moisture content of the sludge in the stockyard is 90%, the total amount of sludge is about 50,000 tons, and the depth of the stockyard is 6 meters. It is required that the moisture content of the treated sludge be reduced to below 60%.

[0026] Mix ferric chloride solution and quicklime according to the ratio of 1:10 to prepare dehydrating agent, Fe in ferric chloride aqueous solution 3+ The content is not less than 38%, and the total mass of dehydrating agent is about 1300 tons.

[0027] Drill the prepared dehydrating agent to the bottom of the sludge with a pressure of 0.4MPa, a speed of 50r / min and a speed of 50cm / min, and then lift it up with a pressure of 25MPa, a speed of 20r / min and a lifting speed of 10cm / min. to the top of the sludge. Then drill another hole at an interval of 1.5m and repeat the above process.

[0028] After all the sludge is mixed with the dehydrating agent, lay a working cushion on the surface, lay a filter layer, insert a drainage bo...

Embodiment 2

[0030] The moisture content of the sludge in the stockyard is 85%, the total amount of sludge is about 100,000 tons, and the depth of the stockyard is 9 meters. It is required that the moisture content of the treated sludge be reduced to below 65%.

[0031] Mix ferric chloride solution and quicklime according to the mass ratio of 1:8 to prepare a dehydrating agent. Fe in the ferric chloride aqueous solution 3+ The content is not less than 38%, and the total mass of dehydrating agent is about 2700 tons.

[0032] Drill the prepared dehydrating agent to the bottom of the sludge with a pressure of 0.7MPa, a speed of 45r / min, and a speed of 45cm / min, and then lift it up with a pressure of 30MPa, a speed of 25r / min, and a lifting speed of 13cm / min. to the top of the sludge. Then drill another hole at an interval of 2.0m and repeat the above process.

[0033] After all the sludge is mixed with the dehydrating agent, lay a working cushion on the surface, lay a filter layer, insert ...

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PUM

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Abstract

The invention discloses an in-situ dewatering method for sludge of sewage treatment plants. The method comprises the steps of injecting sludge dewatering agents into sludge by using a high-pressure jet-grouting pile machine and mixing and stirring the agents with the sludge evenly; and treating the treated sludge by using a conventional vacuum preloading method. The method can overcome difficulties of treatment of large-area sludge stacked places, the sludge is not needed to be excavated and treated in another place, problems of secondary pollution of stink, sewage and the like produced in the excavation and transport process are solved, and the in-situ dewatering method has advantages of short treatment period, low cost and the like compared with treatment methods of burning, compost and the like.

Description

technical field [0001] The invention relates to a method for in-situ dehydration of sewage plant sludge piled up in a large area. The water content of the treated sludge is reduced and the strength is improved. It can be developed and utilized as land for greening, etc., and belongs to the technical field of resource and environment protection . Background technique [0002] Due to the common problem of "heavy water and light mud" in urban sewage treatment in the past, a large amount of sewage plant sludge was directly piled up in landfills or low-lying depressions, river courses, fish ponds and other places. Due to the high moisture content and poor mechanical properties of these large amounts of sludge, it cannot be used for subsequent land use, resulting in a large waste of land resources. [0003] In addition, the existing sludge treatment and disposal technologies mainly include landfill, incineration, building materials, and land utilization. A large amount of sludge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 周灵君边博吴海锁姜伟立范亚民
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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