Conditioning type sludge dewatering agent and method for preparing planting soil from eutrophic water dredged mud

A technology for sludge dewatering and eutrophication, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc. problems such as chemical utilization, to achieve the effect of rapid processing and resource utilization

Pending Publication Date: 2020-12-29
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the water content of the dredged mud can be reduced to achieve reduction after press filtration, the structure of the mud cake obtained by press filtration is relatively dense, which cannot meet the requirements of air permeability, permeability and porosity of the soil as a planting soil, and is difficult to achieve. The purpose of resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] This embodiment is a method for making planting soil from eutrophic water body dredging mud, and the specific steps are as follows:

[0017] 1. Conditioning: Add conditioning sludge dewatering agents to the dredged mud with a moisture content of 90% to 98%, and mix and stir. The mixing and stirring time is not less than 20 minutes.

[0018] In this embodiment, the conditioning sludge dewatering agent is composed of polyaluminum sulfate, sawdust and water retaining agent. The amount of polyaluminum sulfate accounts for 0.5% to 2% of the dry mass percentage of the dredging mud, sawdust accounts for 3% to 10% of the dry mass percentage of the dredging mud, and the water retaining agent accounts for 1‰ to 3‰ of the dry mass percentage of the dredging mud.

[0019] 2. Press filter: pump the dredged mud after the above conditioning to the plate and frame filter press, the feed pressure is 0.5MPa-1.0MPa, the pressing pressure is 1.0MPa-2.0MPa, the filter press time is 20min-60...

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Abstract

The invention relates to a conditioning type sludge dewatering agent and a method for preparing planting soil from eutrophic water dredged mud. The invention aims to provide a conditioning type sludgedewatering agent and a method for preparing planting soil from eutrophic water dredged mud. According to the technical scheme, the conditioning type sludge dewatering agent is characterized by comprising polymeric aluminum sulfate, sawdust and a water-retaining agent. The sludge dewatering agent and the method are suitable for the technical field of resource and environment protection.

Description

technical field [0001] The invention relates to a conditioning type sludge dewatering agent and a method for making planting soil from eutrophic water body dredging mud. It is applicable to the technical field of resource and environment protection. Background technique [0002] The use of environmental protection dredging technology to remove sediment in eutrophic water bodies is one of the common technologies in the field of water environment treatment, which can remove endogenous pollutants and prevent further eutrophication of water bodies. On the one hand, the environment-friendly dredging can accurately remove the pollution layer rich in nitrogen and phosphorus elements in the sediment through small disturbance and precise thin-layer technology. On the other hand, the water content of the dredged mud produced is also high (usually above 90%) . If a stockpile is used to reduce the water content of the dredged mud through natural drainage, the required stockpile area i...

Claims

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Application Information

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IPC IPC(8): C02F11/148C02F11/122C02F11/00C05F7/00
CPCC02F11/148C02F11/122C02F11/00C05F7/00Y02A40/20
Inventor洪思远宁顺理邱辉俞演名
OwnerPOWERCHINA HUADONG ENG COPORATION LTD