CN113718751A - Method for solidifying silt soil based on urease-induced calcium carbonate deposition - Google Patents
Method for solidifying silt soil based on urease-induced calcium carbonate deposition Download PDFInfo
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- CN113718751A CN113718751A CN202110984989.4A CN202110984989A CN113718751A CN 113718751 A CN113718751 A CN 113718751A CN 202110984989 A CN202110984989 A CN 202110984989A CN 113718751 A CN113718751 A CN 113718751A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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Abstract
The invention discloses a method for solidifying silt soil by inducing calcium carbonate deposition based on urease. The method for solidifying the silt soil adopts urease liquid and gel liquid as the solidifying agent, wherein the urease liquid is soybean urease liquid, the gel liquid is a mixed liquid of calcium chloride and urea, and the urease is utilized to induce the deposition of calcium carbonate, so that the method has the advantages of no pollution and no chemical residue, is green and environment-friendly, has wide raw material source of the solidifying agent, low cost, convenient operation, better solidifying effect and good economic benefit, has important practical significance for recycling the silt, has strong practicability and is beneficial to popularization and application.
Description
Technical Field
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
The dredging sludge is a mud-water mixture generated by dredging the sediments in water bodies such as rivers, lakes and the like, and a large amount of dredging sludge is generated every year in hydraulic engineering and shipping engineering in China, so that the passing efficiency of water traffic is influenced, and huge environmental pollution is caused. In addition, a large amount of sludge is generated in rivers and lakes of various cities, so that the rivers are blackened and odorized, and meanwhile, the accumulation of the sludge occupies a large amount of land resources and can cause serious secondary pollution. Aiming at the series of sludge problems, China rapidly develops the action of sludge treatment.
The cause of the sludge is mainly that after industrial wastewater, domestic sewage, urban surface runoff, atmospheric precipitation and the like enter a water body, particles, colloidal substances and water-soluble salts in the sludge are deposited to the bottom of the water body under certain hydraulic conditions through physical and chemical processes such as adsorption, complexation, chemical reaction and the like to form sediments. Therefore, the sludge generally has the advantages of high water content, low strength, large compressibility, fine particle size, organic matters and some pollutants.
The traditional sludge strengthening method mainly utilizes the conventional physical methods such as airing, heat treatment and the like for treatment, needs a longer period and has high cost; the sludge with high plasticity index and high organic content is cured by cement, lime or fly ash, the effect is not ideal, the dry shrinkage coefficient and the temperature shrinkage coefficient of cement cured soil are large and easy to crack, and the strength of the lime cured soil is slowly increased, so that the construction progress is easily influenced. The existing soil solidification technology is widely applied to sludge treatment, a soil solidifying agent can chemically react with water and soil particles in sludge, the water content in the sludge is reduced and converted, the connection effect among the sludge soil particles is enhanced, the strength of the sludge is improved, and other physical properties of the sludge soil are improved. The mechanical property and physical and chemical properties of the solidified silt soil are greatly improved, and the silt soil treated by the curing agent can be recycled, namely the solidified silt soil can be applied to road engineering and filling engineering. However, the sludge solidified by the commonly used curing agents such as cement, lime and the like has a certain curing effect, but the sludge pollutes the environment and the curing cost is relatively high. Therefore, a new green and environment-friendly curing method is needed to treat the silt soil.
Disclosure of Invention
The invention aims to solve the technical problems in the background art and provides a method for solidifying silt soil, which utilizes the urease-induced calcium carbonate deposition technology to solidify silt soil, is green and environment-friendly, has wide raw material sources of a curing agent, low cost, convenient operation, good curing effect and small environmental pollution, and particularly relates to a method for solidifying silt soil by using urease-induced calcium carbonate deposition.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for solidifying silt soil based on urease-induced calcium carbonate deposition is characterized in that a urease-based curing agent is injected into silt, and the silt is kept stand after injection to reach the standard of engineering application; the curing agent comprises urease liquid and a gelling liquid, the gelling liquid is a mixed liquid of calcium chloride and urea, and the specific curing method comprises the following steps:
(1) preparing before curing, building a laboratory near a site to be cured, preparing urease liquid and gel liquid in the laboratory, and pouring the two prepared solutions into corresponding containers to obtain the urease liquid and the gel liquid for later use;
(2) transporting the container filled with urease liquid and gelling liquid to a site needing to solidify sludge;
(3) the sludge is cured on site, a layer of scouring pad is paved on the surface of the sludge to be cured, urease liquid and gelling liquid are injected alternately on the surface of the sludge to be cured, and the injected urease liquid and the injected gelling liquid are respectively permeated into the sludge through the scouring pad, wherein the urease liquid and the gelling liquid are injected in a mode that urease liquid with the volume of 1 time of pore volume is injected firstly, the mixture is kept stand for 0.5 to 1.5 hours after the urease liquid and the gelling liquid with the volume of 1 time of pore volume are injected, and the mixture is reacted for 10 to 12 hours after the urease liquid and the gelling liquid are injected;
(4) and (4) repeating the alternate injection mode in the step (3) until the silt soil is solidified, so that the bearing capacity of the silt soil is enhanced and the standard of engineering application is met.
Further, in the method for solidifying the muddy soil by depositing and solidifying calcium carbonate based on urease, during the operation of solidifying the muddy soil on site in the step (3), urease liquid is injected firstly, then the mixture is kept stand for 1 hour, and then the mixture is injected with the gelling liquid and reacts for 11 hours.
Further, the method for solidifying the silt soil based on the urease-induced calcium carbonate deposition, provided by the invention, comprises the following steps of:
(1) putting the crushed soybean powder into a barrel, adding distilled water into the barrel, wherein the distilled water is added according to the volume ratio of the soybean powder to the distilled water of 1:10 to obtain a soybean powder solution, and fully stirring the soybean powder solution for 30 minutes by using a stirring machine;
(2) placing the stirred solution in a curing box under a low-temperature environment for standing for 24 hours;
(3) and then pouring the standing soybean powder solution into a centrifugal barrel, centrifuging the soybean powder solution by using a high-speed centrifuge at 4000rpm for 15 minutes, and taking the supernatant fluid to obtain the soybean urease liquid after centrifugation.
Further, the method for solidifying the silt soil based on urease-induced calcium carbonate deposition is characterized in that the low-temperature environment in the step (2) is an environment with the temperature of 10-15 ℃ and the relative humidity of 80-85%.
Further, the method for solidifying the silt soil based on the urease-induced calcium carbonate deposition is characterized in that the gel liquid is prepared by mixing calcium chloride and urea with equal molar concentration to form a mixed solution.
The method adopts the soybean urease liquid and the gelling liquid as raw materials, adopts a mode of alternately injecting the urease liquid and the gelling liquid, and adopts the principle of urease-induced calcium carbonate deposition as follows: decomposition of urea to NH Using urease solution4 +And CO3 2-With Ca present in the surrounding environment2+The method combines the two steps to generate a calcium carbonate crystal which has the gelling property and is insoluble, the generation of the calcium carbonate not only cements small particles in silt soil to generate an integral internal structure with certain strength, the generation of the calcium carbonate also increases the roughness of the surface of the soil particles, and meanwhile, the addition of the gelling liquid enables a large amount of high-valence cations to perform ion reaction with the silt soil particles, so that the particle cohering effect is more obvious, and the silt soil body curing effect is better. The specific reaction equation for inducing calcium carbonate deposition using urease is as follows:
CO(NH2)2 + 2H2O → 2NH4 + + CO3 2- (1)
CO3 2- + Ca2+ → CaCO3 (2)
compared with the prior art, the method for solidifying the silt soil by inducing the calcium carbonate deposition based on the urease has the beneficial effects that:
(1) the invention adopts the curing agent based on urease, the curing agent adopts soybean urease liquid and the gelling liquid, and the gelling liquid is the mixed liquid of calcium chloride and urea, so that the invention is more environment-friendly compared with the common curing agents such as cement, lime and the like, and the pollution to the environment is less after the sludge is cured;
(2) the invention adopts the curing agent based on urease, the curing agent has wide raw material source and low price, and in the actual engineering, the cost for curing the sludge by adopting the curing agent is lower, the curing effect is better, not only can good economic benefit be obtained, but also the invention has important realistic significance for the resource utilization of the sludge;
(3) the method for solidifying the silt soil by inducing the calcium carbonate deposition based on the urease is a novel silt solidification treatment technology which gives consideration to resources, environment and sustainable development, has good engineering application prospect, can be applied to the filling of roadbed engineering or other practical engineering, and has wide application prospect.
In conclusion, the method for curing silt soil provided by the invention adopts urease liquid and gel liquid as curing agents, wherein the urease liquid is soybean urease liquid, the gel liquid is a mixed liquid of calcium chloride and urea, and urease is utilized to induce calcium carbonate deposition, so that the method has the advantages of no pollution and no chemical residue, is green and environment-friendly, has wide raw material source of the curing agents, low cost, convenient operation and good curing effect, has good economic benefit, has important practical significance on recycling silt, has strong practicability and is beneficial to popularization and application.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of the method of the present invention for solidifying silt soil based on urease-induced calcium carbonate deposition.
Detailed Description
To further illustrate the concepts of the present invention, the present invention will be further described in detail by way of specific embodiments with reference to the drawings, which are presented for illustrative purposes only and to explain the present invention, and should not be construed as limiting the scope of the invention. All the technologies realized based on the content of the present invention are covered in the protection scope of the present invention.
Example 1:
as shown in figure 1, the method for solidifying the silt soil based on urease-induced calcium carbonate deposition is characterized in that urease-based curing agents are injected into the silt soil, and the silt soil is placed still after the injection, so that the standard of engineering application is met; the curing agent comprises urease liquid and a gelling liquid, wherein the gelling liquid is a mixed solution formed by mixing calcium chloride and urea according to equimolar concentration.
The concrete curing method comprises the following steps:
(1) preparing before curing, building a laboratory near a site to be cured, preparing urease liquid and gel liquid in the laboratory, and pouring the two prepared solutions into corresponding containers to obtain the urease liquid and the gel liquid for later use;
(2) transporting the container filled with urease liquid and gelling liquid to a site needing to solidify sludge;
(3) the sludge is cured on site, a layer of scouring pad is paved on the surface of the sludge to be cured, then urease liquid and gelling liquid are alternately injected into the surface of the sludge to be cured, and the injected urease liquid and the injected gelling liquid are respectively permeated into the sludge through the scouring pad, wherein the urease liquid and the gelling liquid are injected in a mode that urease liquid with 1 time of pore volume is injected firstly, the mixture is kept stand for 0.5 hour after the urease liquid and the gelling liquid are injected, and then the mixture is injected into the mixture with 1 time of pore volume and reacts for 10 hours after the urease liquid and the gelling liquid are injected;
(4) and (4) repeating the alternate injection mode in the step (3) until the silt soil is solidified, so that the bearing capacity of the silt soil is enhanced and the standard of engineering application is met.
The preparation method of the soybean urease liquid comprises the following steps:
(1) putting the crushed soybean powder into a barrel, adding distilled water into the barrel, wherein the distilled water is added according to the volume ratio of the soybean powder to the distilled water of 1:10 to obtain a soybean powder solution, and fully stirring the soybean powder solution for 30 minutes by using a stirring machine;
(2) placing the stirred solution in a curing box under a low-temperature environment for standing for 24 hours; the low-temperature environment refers to an environment with the temperature of 10-15 ℃ and the relative humidity of 80-85%;
(3) and then pouring the standing soybean powder solution into a centrifugal barrel, centrifuging the soybean powder solution by using a high-speed centrifuge at 4000rpm for 15 minutes, and taking the supernatant fluid to obtain the soybean urease liquid after centrifugation.
Example 2:
as shown in figure 1, the method for solidifying the silt soil based on urease-induced calcium carbonate deposition is characterized in that urease-based curing agents are injected into the silt soil, and the silt soil is placed still after the injection, so that the standard of engineering application is met; the curing agent comprises urease liquid and a gelling liquid, wherein the gelling liquid is a mixed solution formed by mixing calcium chloride and urea according to equimolar concentration.
The concrete solidification method was substantially the same as in example 1, except that in the course of alternately injecting the urease solution and the gelling solution, the urease solution was first injected in 1 pore volume, left to stand for 1 hour after injection, and then the gelling solution was injected in 1 pore volume and reacted for 11 hours after injection.
Example 3:
as shown in figure 1, the method for solidifying the silt soil based on urease-induced calcium carbonate deposition is characterized in that urease-based curing agents are injected into the silt soil, and the silt soil is placed still after the injection, so that the standard of engineering application is met; the curing agent comprises urease liquid and a gelling liquid, wherein the gelling liquid is a mixed solution formed by mixing calcium chloride and urea according to equimolar concentration.
The concrete curing method was substantially the same as in example 1, except that in the course of alternately injecting the urease solution and the gelling solution, the urease solution was first injected in 1-fold pore volume, left to stand for 1.5 hours after injection, and then the gelling solution was injected in 1-fold pore volume and reacted for 12 hours after injection.
In order to illustrate the curing effect of the method, the same sludge is selected and divided into five test groups, wherein the three test groups are respectively cured by the methods of the embodiments 1 to 3; and the other two test groups adopt the method that urease liquid and gel liquid are mixed and then injected simultaneously, urease liquid with the pore volume of 1 time is injected firstly, the mixture is kept stand for 2 to 3 hours after injection, then the gel liquid with the pore volume of 1 time is injected, and the reaction is carried out for 20 to 24 hours after injection. By comparing the difference between the standing time of the urease liquid and the reaction time of the gelling liquid, for the standing time, if the standing time is short, the permeation effect of the urease liquid in the sludge is poor, and if the standing time is long, the purpose of full permeation can be achieved, but the decomposition effect of the urease liquid on the urea is not ideal; on the other hand, if the reaction time is short, the urea cannot be decomposed effectively, and if the reaction time is long, the urea can be reacted sufficiently, but the cohesive property of the gelled fluid and the high-valence cations in the sludge soil to form particles is poor. Finally, through detection, the urease liquid is injected and then stands for 1 hour, and the gel liquid is injected and then reacts for 11 hours, so that the optimal curing effect can be achieved.
In conclusion, the method for solidifying the silt soil has the advantages of no pollution and no chemical residue, is green and environment-friendly, has wide raw material source of the solidifying agent, low cost, convenient operation, good solidifying effect and good economic benefit, has important practical significance for recycling the silt, has strong practicability and is beneficial to popularization and application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. A method for solidifying silt soil based on urease-induced calcium carbonate deposition is characterized by comprising the following steps: the method for solidifying the silt soil comprises the steps of injecting a urease-based curing agent into the silt, and standing the silt after injection to reach the standard of engineering application; the curing agent comprises urease liquid and a gelling liquid, the gelling liquid is a mixed liquid of calcium chloride and urea, and the specific curing method comprises the following steps:
(1) preparing before curing, building a laboratory near a site to be cured, preparing urease liquid and gel liquid in the laboratory, and pouring the two prepared solutions into corresponding containers to obtain the urease liquid and the gel liquid for later use;
(2) transporting the container filled with urease liquid and gelling liquid to a site needing to solidify sludge;
(3) the sludge is cured on site, a layer of scouring pad is paved on the surface of the sludge to be cured, urease liquid and gelling liquid are injected alternately on the surface of the sludge to be cured, and the injected urease liquid and the injected gelling liquid are respectively permeated into the sludge through the scouring pad, wherein the urease liquid and the gelling liquid are injected in a mode that urease liquid with the volume of 1 time of pore volume is injected firstly, the mixture is kept stand for 0.5 to 1.5 hours after the urease liquid and the gelling liquid with the volume of 1 time of pore volume are injected, and the mixture is reacted for 10 to 12 hours after the urease liquid and the gelling liquid are injected;
(4) and (4) repeating the alternate injection mode in the step (3) until the silt soil is solidified, so that the bearing capacity of the silt soil is enhanced and the standard of engineering application is met.
2. The method of claim 1 for consolidating silt soil based on urease-induced calcium carbonate deposition, wherein: in the process of the on-site sludge solidification operation in the step (3), the urease solution is injected firstly, then the mixture is kept stand for 1 hour, and then the gelling solution is injected for reaction for 11 hours.
3. The method of claim 1 for consolidating silt soil based on urease-induced calcium carbonate deposition, wherein: the urease liquid is soybean urease liquid, and the preparation method of the soybean urease liquid comprises the following steps:
(1) putting the crushed soybean powder into a barrel, adding distilled water into the barrel, wherein the distilled water is added according to the volume ratio of the soybean powder to the distilled water of 1:10 to obtain a soybean powder solution, and fully stirring the soybean powder solution for 30 minutes by using a stirring machine;
(2) placing the stirred solution in a curing box under a low-temperature environment for standing for 24 hours;
(3) and then pouring the standing soybean powder solution into a centrifugal barrel, centrifuging the soybean powder solution by using a high-speed centrifuge at 4000rpm for 15 minutes, and taking the supernatant fluid to obtain the soybean urease liquid after centrifugation.
4. The method of claim 3 for consolidating silt soil based on urease-induced calcium carbonate deposition, wherein: the low-temperature environment in the step (2) is an environment with the temperature of 10-15 ℃ and the relative humidity of 80-85%.
5. The method of claim 1 for consolidating silt soil based on urease-induced calcium carbonate deposition, wherein: the preparation method of the gel liquid is a mixed solution formed by mixing and preparing calcium chloride and urea with equal molar concentration.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112596A (en) * | 2021-12-06 | 2022-03-01 | 郑州大学 | Method for treating yellow river sediment by using soybean urease-induced calcium carbonate |
| CN114605046A (en) * | 2022-01-21 | 2022-06-10 | 西安建筑科技大学 | Chitosan-enhanced enzyme-induced carbonate precipitation curing agent and application method thereof |
| CN115403230A (en) * | 2022-08-26 | 2022-11-29 | 中建四局第三建设有限公司 | Composite curing agent for curing silt soil and curing method |
| CN116217037A (en) * | 2023-01-09 | 2023-06-06 | 北京科技大学 | Treatment method, reactant and application of silt soil discharged by shield tunnel |
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| CN109880630A (en) * | 2019-02-28 | 2019-06-14 | 东南大学 | A kind of plant urase sand-fixation method |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109880630A (en) * | 2019-02-28 | 2019-06-14 | 东南大学 | A kind of plant urase sand-fixation method |
Non-Patent Citations (1)
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| 刘汉龙等: ""微生物加固岛礁地基现场试验研究"", 《地基处理》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112596A (en) * | 2021-12-06 | 2022-03-01 | 郑州大学 | Method for treating yellow river sediment by using soybean urease-induced calcium carbonate |
| CN114605046A (en) * | 2022-01-21 | 2022-06-10 | 西安建筑科技大学 | Chitosan-enhanced enzyme-induced carbonate precipitation curing agent and application method thereof |
| CN115403230A (en) * | 2022-08-26 | 2022-11-29 | 中建四局第三建设有限公司 | Composite curing agent for curing silt soil and curing method |
| CN116217037A (en) * | 2023-01-09 | 2023-06-06 | 北京科技大学 | Treatment method, reactant and application of silt soil discharged by shield tunnel |
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Application publication date: 20211130 |