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Method for researching nigration and conversion of pollutant in soil and its equipment

A technology for polluting soil and pollutants, applied in the field of environmental chemistry, which can solve the problems of difficult control of experimental conditions, poor accuracy of results, and difficulty in studying relative effects.

Inactive Publication Date: 2003-11-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental conditions of this type of research are indeed very close to or basically the same as the actual soil, but due to the difficulty in controlling the experimental conditions, the results generally have poor accuracy. The relative contribution of the process to its overall disappearance process and the interaction between each process, it is more difficult to study the relative impact of various environmental conditions on the processes of pollutants in soil

Method used

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  • Method for researching nigration and conversion of pollutant in soil and its equipment
  • Method for researching nigration and conversion of pollutant in soil and its equipment
  • Method for researching nigration and conversion of pollutant in soil and its equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The device for studying pollutant migration and transformation in soil of the present invention comprises:

[0073] A device A1 providing an air source, such as an air cylinder;

[0074] General-purpose gas flowmeters A3, A3', control the gas flow at 15-90ral / min: gas flowmeters A3, A3' each correspond to a gas phase channel;

[0075] A constant temperature circulating water bath V3, such as Figure 7 , with heating and cooling functions, the volume is 24 liters, the circulating fluid is a mixture of water and ethylene glycol, and its volume ratio is 1:1. The constant temperature circulating water bath has a built-in circulating water pump 45, with circulating fluid inlet 24 and circulating fluid outlet 23 at the rear, liquid phase inlet 3, 3', liquid phase outlet 4, 4', gas phase inlet 14, 14' and gas phase outlet on the upper panel 15, 15'. Each soil column corresponds to a group of gas phase inlets and outlets 14, 15, 14', 15', liquid phase inlets and outlets 3, 4...

Embodiment 2

[0091] The purpose of the experiment: to verify the airtightness of the soil pollution real-time simulation system of the present invention, and the performance of anti-sorption interference; and use the simulation system to study the migration behavior of chlorobenzene compounds entering the soil, and measure the volatilization of target compounds , infiltration amount and residual distribution in soil, to verify the scientificity and practicability of the system, the device in Example 1 was adopted.

[0092] Use the uniform application method for artificially configured contaminated soil:

[0093] Prepare the aqueous solution of the mixture of chlorobenzene compounds, the dosage is as shown in Table 1, add 4 kg of soil, stir evenly for later use; insert polytetrafluoroethylene sieve plate 18 into the soil columns T1 and T2, add the gravel layer 19. The gravel layer (comprising gravel, fine sand and glass wool) 19 has a height of 20 mm, and the evenly stirred 4 kg of soil con...

Embodiment 3

[0107] The surface application method is used for artificially prepared contaminated soil:

[0108] Insert polytetrafluoroethylene sieve plate 18, gravel layer (comprising gravel, fine sand and glass wool) 19 in soil column T1, T2, the height of gravel layer 19 is 20mm, adds test soil in soil column T1, T2 , so that the height difference between the soil surface and the air inlet or air outlet 13, 13' of the soil column is 30-80 mm, and the aqueous solution of the mixture of polluting compounds prepared in advance is evenly sprinkled on the soil surface to quickly seal the soil column.

[0109] The simulated environmental conditions were changed to low temperature and low airflow: temperature 5°C, gas flow rate 15ml / min, precipitation rate 3ml / min. All the other methods are the same as in Example 2. This condition simulates a cooler season in the environment with less wind speed, less precipitation, or less irrigation. The experimental results are shown in Table 2.

[0110]...

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Abstract

The present invention relates to a method for researching migration and conversion of pollutant in soil and its equipment. It is characterized by utilizing constant temp. circulating water bath to control soil temp. at 5 deg.C-35 deg.C; utilizing air flowmeter to measure and regulate air flow rate at 15-90 ml / min; using peristaltic pump to provide precipitation and control liquid flow rate at 0-20 ml / min; real-time collecting gas phase sample and liquid phase sample, and under the condition of simultaneously controlling temp., wind speed and precipitation, researching the behaviours of volatilization, in filtration, degradation and stagnation, etc. of pollution in soil, their interrelation and influence of various environmental factors to these behaviours. Said invented equipment has good closed property.

Description

technical field [0001] The invention belongs to the technical field of environmental chemistry, in particular to a method and a device for studying the migration and transformation of pollutants in soil. Background technique [0002] There are two main methods used to study pollutants in soil, that is, experiments under artificially controlled conditions and experiments under "natural" soil environmental conditions. Research under artificial control conditions is mainly to take measures to highlight or accelerate one or two processes, while controlling or ignoring the progress of other processes, so as to facilitate the monitoring research of the process. For example, screening and cultivating microorganisms in soil to study the degradation process of organic matter; using a closed air circulation soil chamber system to study the volatilization and sedimentation process of pollutants; using the top spray method to study the infiltration process of pol...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 王敏健樊耀波胡永梅胡枭甘平
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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