Method for measuring nonlinear isothermal-adsorption curve of cohesive soil

A kind of isotherm adsorption curve, nonlinear technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of long breakdown time, ignoring nonlinear adsorption, ignoring diffusion effect, etc., to achieve good reliability.

Active Publication Date: 2015-11-04
ZHEJIANG UNIV
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Problems solved by technology

However, there are some deficiencies in the extraction process of its adsorption parameters: the concentration profile method and the breakdown curve method assume that the adsorption at the soil-water interface conforms to linear adsorption in the process of solving the adsorption parameters, ignoring the influence of nonlinear adsorption; the time modulus method assumes that the diffusion The coefficient is 0, ignoring the influence of diffusion
In addition, for cohesive soil columns, the soil column test method also has the problem that the breakdown time is too long
Therefore, there is a lack of a method in the prior art that can directly obtain the nonlinear isotherm adsorption curve of pollutants in a clay column in a relatively short period of time.

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  • Method for measuring nonlinear isothermal-adsorption curve of cohesive soil
  • Method for measuring nonlinear isothermal-adsorption curve of cohesive soil
  • Method for measuring nonlinear isothermal-adsorption curve of cohesive soil

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Embodiment Construction

[0029] specific implementation plan

[0030] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation scope of the present invention is not limited.

[0031] The present invention mainly prepares a batch of short soil columns with a height of 2 cm through compression and consolidation as the soil samples 4 in the soil sample cylinder 3, which are respectively connected with the Marlson jars 1 containing different concentration target pollutant solutions, and the Marble jars 1 and the The soil sample cylinder 3 is connected through the conduit 2, the outlet of the lower end of the Martens jar 1 is provided with the outlet valve 6 of the Martens jar, the inlet of the top of the Martens jar 1 is provided with the inlet valve 5 of the Martens jar, and the outlet of the bottom end of the soil sample cylinder 3 is provided with a valve 6. A soil sample cylinder outlet valve 7 is arranged.

[0032] Then,...

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Abstract

The invention discloses method for measuring a nonlinear isothermal-adsorption curve of cohesive soil. Through compression and consolidation, a batch of short earth-pillars of 2 cm high are prepared; the short earth-pillars are respectively connected to Markov bottles filled with different concentrations of target pollutant solutions; a short earth-pillar breakdown test is carried out at constant head so as to obtain an outflow curve of a target pollutant at different source concentrations and concentration of pollutants in interstitial water of the short earth-pillars after outflow concentration is stable; slice digestion is carried out on each short earth-pillar after the outflow concentration is stable, total amount of pollutants adsorbed in the short earth-pillars is measured, and the nonlinear isothermal-adsorption curve of the short earth-pillars is obtained by fitting of test data points of different pollution source concentrations. By the method, the nonlinear isothermal-adsorption curve of target pollutants in earth-pillars of cohesive soil can be directly obtained within a short period of time. In addition, the test method is reliable.

Description

technical field [0001] The invention relates to a method for measuring the isothermal adsorption curve, in particular to a method for measuring the nonlinear isothermal adsorption curve of cohesive soil, which can directly obtain the concentration of pollutants in the cohesive soil column in a relatively short period of time. Nonlinear adsorption isotherms. Background technique: [0002] As an important material for antifouling barriers, cohesive soil has the characteristics of low permeability and strong adsorption. The determination of its adsorption characteristics is the basis for the evaluation of the service time of antifouling barriers. The adsorption of cohesive soil is obviously nonlinear, and the adsorption parameters decrease with the increase of pollution source concentration and soil-water ratio (S / L). Therefore, a complete nonlinear isotherm adsorption curve must be used to analyze its adsorption characteristics. The existing non-linear adsorption isotherm cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 詹良通龚标王顺玉
Owner ZHEJIANG UNIV
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