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Method for solidifying sludge soil based on urease induced calcium carbonate deposition

A technology for curing silt and calcium carbonate, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of environmental pollution and high curing cost, and achieve the effect of no chemical residue, good curing effect, and conducive to popularization and application

Inactive Publication Date: 2021-11-30
THE THIRD CONSTR & ENG OF CCFED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after curing the sludge with commonly used curing agents such as cement and lime, although there is a certain curing effect, they will pollute the environment, and the curing cost is relatively high

Method used

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  • Method for solidifying sludge soil based on urease induced calcium carbonate deposition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown, a kind of method of solidifying silt soil based on urease-induced calcium carbonate deposition of the present invention, the method for described solidifying silt soil is to inject the solidifying agent based on urease in silt, leave standstill after injecting, reach the standard of engineering application That is, the curing agent includes urease solution and gelling solution, and the gelling solution is a mixed solution formed by mixing calcium chloride and urea at equimolar concentrations.

[0031] Concrete curing method comprises the following steps:

[0032] (1) Preparatory work before curing, first set up a laboratory near the site to be cured, then prepare urease solution and gelling solution in the laboratory, and pour the two prepared solutions into corresponding containers to obtain urease solution and gelling solution The gelling solution is ready for use;

[0033] (2) Transport the container containing urease liquid and gelling solu...

Embodiment 2

[0041] Such as figure 1 Shown, a kind of method of solidifying silt soil based on urease-induced calcium carbonate deposition of the present invention, the method for described solidifying silt soil is to inject the solidifying agent based on urease in silt, leave standstill after injecting, reach the standard of engineering application That is; wherein the curing agent includes urease solution and gelling solution, and the gelling solution is a mixed solution formed by mixing calcium chloride and urea at equimolar concentrations.

[0042] The specific solidification method is basically the same as that of Example 1, the difference being that in the process of alternately injecting urease solution and gelling solution, first inject 1 times the urease solution of the pore volume, let it stand for 1 hour after injecting, and then inject 1 times the pore volume Pore ​​volume of the gelling solution, reacted for 11 hours after injection.

Embodiment 3

[0044] Such as figure 1 Shown, a kind of method of solidifying silt soil based on urease-induced calcium carbonate deposition of the present invention, the method for described solidifying silt soil is to inject the solidifying agent based on urease in silt, leave standstill after injecting, reach the standard of engineering application That is; wherein the curing agent includes urease solution and gelling solution, and the gelling solution is a mixed solution formed by mixing calcium chloride and urea at equimolar concentrations.

[0045] The specific solidification method is basically the same as that of Example 1, the difference being that in the process of alternately injecting urease solution and gelling solution, first inject 1 times the urease solution of the pore volume, let it stand for 1.5 hours after injecting, and then inject 1 times the pore volume Pore ​​volume of the gelling solution, reacted for 12 hours after injection.

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Abstract

The invention discloses a method for solidifying sludge soil based on urease induced calcium carbonate deposition. The method for solidifying the sludge soil comprises the following steps: injecting a urease-based curing agent into sludge, and standing after injection until the standard of engineering application is reached. According to the method for solidifying the sludge soil, urease liquid and gelling liquid are adopted as the curing agent, the urease liquid is soybean urease liquid, the gelling liquid is the mixed liquid of calcium chloride and urea, calcium carbonate is induced to deposit through urease, the advantages of being free of pollution and chemical residues are achieved, environmental protection is achieved, and the curing agent is wide in raw material source, low in cost, convenient to operate, good in curing effect, good in economic benefit, high in practicability and beneficial to popularization and application, and has important practical significance on resource utilization of the sludge.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for solidifying silt soil based on urease-induced calcium carbonate deposition. Background technique [0002] Dredged silt refers to the mud-water mixture produced by dredging the sediments of rivers, lakes and other water bodies. my country's water conservancy projects and shipping projects produce a large amount of dredged silt every year, which will not only affect the efficiency of water traffic but also cause huge losses. environmental pollution. In addition, the rivers and lakes in various cities also produce a large amount of silt, which makes the river black and smelly. At the same time, the accumulation of silt occupies a large amount of land resources and causes serious secondary pollution. In response to the above series of sludge problems, our country quickly carried out sludge treatment actions. [0003] The main cause of sludge is that after indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12
CPCE02D3/12
Inventor 李磊叶骏杨俊涛冉鹏林代波波操子明
Owner THE THIRD CONSTR & ENG OF CCFED