A composite sand-fixing model and its preparation method and application

A technology of model and reinforcement solution, applied in application, chemical instruments and methods, fertilizer mixture, etc., can solve the problems of low crust strength, easy cracking by wind erosion, poor tolerance and other problems of microbial solidified sandy soil crust, and is suitable for large-scale use , Facilitate growth and improve surface roughness

Active Publication Date: 2019-09-10
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved: the purpose of the present invention is to provide a composite sand-soil fixation method for the existing effective biological sand-fixation methods, which have low strength, high brittleness, easy cracking, easy cracking by wind erosion, and poor tolerance. Sand-fixing model and its preparation method and application, the method has little impact on the environment, low cost, simple and effective, and good sand-fixing effect

Method used

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  • A composite sand-fixing model and its preparation method and application
  • A composite sand-fixing model and its preparation method and application
  • A composite sand-fixing model and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing a composite sand-fixing model, comprising the following steps:

[0025] (1) Preparation of microbial reinforcement solution: press Bacillus pasteurianus by 10 7 ~10 9 each / mL is inoculated into the culture solution to obtain the bacterial solution, and the bacterial solution is mixed with the treatment solution in an equimolar ratio to obtain a microbial reinforcement solution; the treatment solution is a mixture of urea and an aqueous solution of calcium chloride in an equimolar ratio.

[0026] The medium components of Bacillus pasteurianus are: 20g / L yeast extract, 10g / L NH 4 Cl, 2.4g / L NiCl 2 , 1g / L MnSO 4 , using 0.1g / L NaOH solution to adjust the pH of the culture medium to 9; mix it evenly with a magnetic stirrer and place it in a high-temperature autoclave at 120°C for 30 minutes; And placed in a constant temperature shaking incubator, 30 ℃, 100r / min culture 24h standby.

[0027] Measuring the activity of the bacterial liquid: measurin...

Embodiment 2

[0038] The superiority of the composite sand-fixing model was verified by preparing two different types of sand-fixing models.

[0039] 1. Model 1 such as figure 1 In a, the production includes the following steps:

[0040] (1) Formation preparation

[0041] Choose Gansu sandy soil as the formation, weigh 1.23kg, and bury it in a cylinder with a hole at the bottom and a diameter of 18.50cm. The height of the formation is 3.5cm, and the dry density is controlled at 1.31g / cm 3 .

[0042] (2) Culture of bacteria

[0043] The medium components of Bacillus pasteurianus are: 20g / L yeast extract, 10g / L NH 4 Cl, 2.4g / L NiCl2 , 1g / L MnSO 4 , using 0.1g / L NaOH solution to adjust the pH of the medium to 9, mix it evenly with a magnetic stirrer, and then place it in a high-temperature autoclave at 120°C for 30 minutes; 7 ~10 9 cells / mL were inoculated into the culture medium, placed in a constant temperature shaking incubator, and cultured at 30°C and 100r / min for 24h for later use...

Embodiment 3

[0058] According to the test variables: (1) wind speed; (2) fiber; (3) treatment liquid concentration, a total of 36 working conditions were used to prepare the formation to be treated.

[0059] Weigh 2.0kg of sand and put it in a cuboid model box with a length of 24cm, a width of 17cm, and a height of 4cm, and control the dry density of the formation to 1.23g / cm 3

[0060] Prepare 4 kinds of CaCl according to the test variable treatment solution concentration 2 Treatment solution in equimolar ratio to urea, CaCl 2 The concentrations are 0.25mol / L, 0.5mol / L, 0.75mol / L, and 1mol / L, respectively.

[0061] The bacteria solution with an activity higher than 0.2mS / cm / min is selected and mixed with the treatment solution in an equimolar ratio to prepare the microbial reinforcement solution.

[0062] Put the reinforcement liquid in the watering can, and the amount of spraying at one time is 4L / m 2 , to ensure that the sprayed liquid is always in the form of mist, a total of 3 spr...

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Abstract

The invention discloses a composite sand fixation model, and a preparation method and applications of same. In the method, fiber filaments are spray-spread on a field and a microbial-fixation solution is sprayed on the surface of the fiber filaments, so that the microbial-fixation solution is hardened on the surface layer of and inside sand; and with the fiber filaments, a rib reinforcing structure is formed. The structure overcomes the defects that a conventional microbial sand fixation method is high in brittleness of surface layer, is poor in durability and is liable to cause wind erosion, and the problems that a conventional geotechnical fiber mesh sand fixation method is high in cost and labor intensity consumption. When the fiber filaments are spray-spread, surface roughness of sand is improved and wind speed on ground surface is reduced, so that movement of sand is effectively inhibited or reduced and anti-wind erosion property is improved. Sand, which is reinforced by means of the composite sand fixation model, in a desert area is improved in bearing performance and tensile strength and compressive strength, wherein anti-deformation capability of soil body is improved and brittleness is weakened.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a sand-fixing method for desertification control, in particular to a composite sand-fixing model and its preparation method and application. Background technique [0002] Land desertification is an important ecological and environmental problem at present. It poses a serious threat to the development of human economy and the improvement of living environment, and it urgently needs to be solved and managed by countries all over the world. In recent years, sand-fixing methods for desertification control at home and abroad mainly include three methods: physical sand-fixation, chemical sand-fixation and biological sand-fixation. Physical sand fixation methods mainly use sand barriers, sand piles, and sand nets. However, this method is costly, labor-intensive, and the specific implementation method is complicated. Chemical sand fixation refers to the spraying of chemical windpro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40E02D3/00C09K103/00
CPCC09K17/40C09K2103/00E02D3/00Y02A40/22
Inventor 高玉峰汤昕怡何稼王丽亚孟浩
Owner HOHAI UNIV
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