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Chitosan enhanced enzyme induced carbonate precipitation curing agent and application method thereof

A technology of carbonate precipitation and chitosan, applied in chemical instruments and methods, biochemical equipment and methods, fixed/solidified sludge treatment, etc., to achieve the effect of less repair times, high repair efficiency, and guaranteed repair efficiency

Active Publication Date: 2022-06-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Enzyme-induced carbonate precipitation technology requires enzymes with high catalytic activity. At present, refined urease is commonly used, but the cost of refined urease is high, and the size of urease is nano-scale. Nano-scale urease usually exists in the solution in a free state and cannot Provide nucleation sites for carbonate precipitation, in addition, urease activity will be affected by the toxicity of heavy metal ions, resulting in inactivation and reduced repair efficiency

Method used

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  • Chitosan enhanced enzyme induced carbonate precipitation curing agent and application method thereof
  • Chitosan enhanced enzyme induced carbonate precipitation curing agent and application method thereof
  • Chitosan enhanced enzyme induced carbonate precipitation curing agent and application method thereof

Examples

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preparation example Construction

[0039] In the present invention, the activity of urease in the urease solution is 342.7U / g.

[0040] Among the present invention, the preparation method of described chitosan colloidal solution comprises the following steps:

[0041] Step 1, under the condition of magnetic stirring, chitosan is added in the acetic acid solution, continuously stirred until there is no particle, and the glue is obtained; the degree of deacetylation of the chitosan is 75%~95%; the volume of the acetic acid solution is 50 to 400 times the mass of chitosan, the volume unit of the acetic acid solution is mL, the unit of the chitosan mass is g, and the mass percent concentration of the acetic acid solution is 1% to 10%;

[0042]Step 2. Under magnetic stirring conditions, add sodium hydroxide solution into the glue solution described in step 1 until the pH is 5.5 to 6.8, and continue to stir until there are no particles and the system is clear and transparent to obtain a chitosan colloid solution; the...

Embodiment 1

[0056] Example 1

[0057] The present embodiment provides a chitosan-enhanced enzyme-induced carbonate precipitation curing agent, comprising urease solution, chitosan colloidal solution and urea solution; the volume of the chitosan colloidal solution is 9 times the volume of the urease solution, so The volume of the urea solution is 5 times the volume of the urease solution; the concentration of the urease solution is 60g / L; the concentration of the urea solution is 2mol / L.

[0058] In this example, the activity of urease in the urease solution is 342.7 U / g.

[0059] In the present embodiment, the preparation method of described chitosan colloidal solution comprises the following steps:

[0060] Step 1, under the condition of magnetic stirring, add 0.9g chitosan into 90mL acetic acid solution, continue to stir until there are no particles, and obtain a glue; the degree of deacetylation of the chitosan is 75% to 95%; the acetic acid solution The mass percentage concentration...

Embodiment 2

[0078] Example 2

[0079] The present embodiment provides a chitosan-enhanced enzyme-induced carbonate precipitation curing agent, comprising urease solution, chitosan colloidal solution and urea solution; the volume of the chitosan colloidal solution is 9 times the volume of the urease solution, so The volume of the urea solution is 5 times the volume of the urease solution; the concentration of the urease solution is 60g / L; the concentration of the urea solution is 2mol / L.

[0080] In this example, the activity of urease in the urease solution is 342.7 U / g.

[0081] In the present embodiment, the preparation method of described chitosan colloidal solution comprises the following steps:

[0082] Step 1, under the condition of magnetic stirring, add 0.9g chitosan into 90mL acetic acid solution, continue to stir until there are no particles, and obtain a glue; the degree of deacetylation of the chitosan is 75% to 95%; the acetic acid solution The mass percentage concentration...

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Abstract

The invention discloses a chitosan enhancing enzyme induced carbonate precipitation curing agent and an application method thereof, the chitosan enhancing enzyme induced carbonate precipitation curing agent comprises a urease solution, a chitosan colloidal solution and a urea solution; the volume of the chitosan colloidal solution is 4-9 times that of the urease solution, and the volume of the urea solution is 1.5-10 times that of the urease solution; the concentration of the urease solution is 20 g / L to 100 g / L; the concentration of the urea solution is 0.5 mol / L to 4 mol / L. According to the curing agent, heavy metal pollution is cured through a curing agent system containing a urease solution, a chitosan colloidal solution and a urea solution so as to achieve pollution remediation, heavy metal ions are wrapped through high-activity catalytic carbonate precipitation of the urease system under protection of chitosan, pollutant migration and diffusion can be effectively avoided, and the pollution remediation effect is improved. And the highest repairing efficiency can reach 99%.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a chitosan-enhanced enzyme-induced carbonate precipitation curing agent and an application method thereof. Background technique [0002] With the rapid development of social industrialization, environmental problems worldwide have become increasingly prominent. Various heavy metal pollutants migrate around through groundwater, soil pore water, etc., causing different degrees of water and soil pollution. The way will cause certain harm to the human body. In the past few decades, a variety of in-situ and ex-situ remediation technologies for heavy metal-contaminated soils have emerged, and decontamination is achieved through solidification, stabilization, electrokinetic extraction, soil flushing, and phytoremediation, among which enzyme-induced Carbonate precipitation technology has no risk of secondary pollution, and is relatively green and environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/02C12N9/80C02F101/20
CPCC02F11/008C02F11/02C12N9/80C12Y305/01005C02F2101/20
Inventor 徐银龙王琳郑文杰
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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