Simulation test apparatus for persulfate hot-steam activated advanced oxidation ex-situ restoration of contaminated soil and simulation test method thereof

A technology of persulfate and ex-situ remediation, applied in the field of contaminated soil remediation, can solve the problems of large ineffective loss, changing soil physical and chemical properties, reducing soil pH value, etc., to achieve the effect of improving mixing efficiency

Active Publication Date: 2014-03-12
上海环境保护有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the above characteristics, Fenton's reagent has the following disadvantages as an oxidant: (1) Hydrogen peroxide is easy to decompose and has low stability; (2) During the repair process, it reacts violently in a short period of time, easily generates gas and releases intense heat, and has a large ineffective loss (3) The effective time of restoration is short, usually only a few hours; (4) Requires stricter protective measures; (5) Due to its strong acidity, it will significantly reduce the soil pH and change the soil physical and chemical properties. The soil contains heavy metal pollutants, and the reduction of pH may significantly increase the mobility of heavy metal

Method used

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  • Simulation test apparatus for persulfate hot-steam activated advanced oxidation ex-situ restoration of contaminated soil and simulation test method thereof
  • Simulation test apparatus for persulfate hot-steam activated advanced oxidation ex-situ restoration of contaminated soil and simulation test method thereof
  • Simulation test apparatus for persulfate hot-steam activated advanced oxidation ex-situ restoration of contaminated soil and simulation test method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Such as Figure 1~3 As shown, a simulated test device for activated persulfate hot steam of the present invention for ectopic repair of polluted soil mainly includes a liquid agent delivery unit, a steam generation delivery unit, a multi-functional crushing mixing spraying unit and its supporting airtight mixing container unit, where:

[0051] The liquid medicament delivery unit includes a solution storage tank 16 , an antiseptic peristaltic pump 15 , a liquid flow meter 14 and a liquid delivery pipeline 17 . The solution storage tank 16 is used to store the prepared persulfate solution. One end of the anti-corrosion peristaltic pump 15 is connected with the solution storage tank 16 to generate power, and the persulfate solution is delivered to the liquid flow meter 14 by means of the liquid delivery pipeline 17 and finally enters the Broken stirring shaft 8. The liquid flow meter 14 is used to record the flow rate of the persulfate solution and calculate the added am...

Embodiment 2

[0061] A simulation test device using persulfate hot steam to activate advanced oxidation ectopic remediation of polluted soil described in Example 1, to simulate the impact of steam injection on soil temperature and soil redox potential under a certain amount of persulfate addition , the simulation test method is as follows:

[0062] (1) Weigh 4g of sodium persulfate, dissolve it in deionized water to form a 40ml solution, and put it into the solution storage tank 16;

[0063] (2) Input deionized water into the steam generator 19, and turn on the power switch to prepare hot steam;

[0064] (3) Weigh 200g of PAH-contaminated soil that has passed through a 20-mesh sieve, place it in the lower assembly 23 of the split container, and place it on the liftable base 30; adjust the height of the liftable base 30 until it reaches the bottom of the split container The opening 25 on the component is tightly connected with the sealing ring 7 on the crushing stirring shaft; the upper com...

Embodiment 3

[0073] A kind of simulated test device that utilizes persulfate hot steam to activate advanced oxidation ectopic remediation of polluted soil described in Example 1 is carried out, and simulates the effect of persulfate addition on soil pH, soil redox potential and multiple The influence of cycloaromatics degradation efficiency, simulation test method is basically the same as embodiment 2, and difference is:

[0074] (1) Weigh 2g of sodium persulfate, dissolve it in deionized water to form a 40ml solution, and put it into the solution storage tank 16;

[0075] Carry out sequentially according to the steps from (2) to (5) in Example 2;

[0076] (6) Open the valve 18 on the tee pipe 12 connected to the steam generating and conveying unit, turn on the power supply of the steam flowmeter 20, adjust the steam flow rate to 10L / min, input the hot steam into the crushing stirring shaft 8, and pass through the crushing stirring shaft 8 The spray hole 10 realizes the injection of hot s...

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Abstract

The invention discloses a simulation test apparatus for persulfate hot-steam activated advanced oxidation ex-situ restoration of contaminated soil and a simulation test method thereof. The apparatus comprises a liquid reagent conveying unit, a steam generating and conveying unit and a multifunctional crushing, stirring and sprinkling unit and a matched enclosed stirring container unit thereof, wherein the multifunctional crushing, stirring and sprinkling unit comprises a hollow crushing and mixing shaft provided with a plurality of hammer type blades and sprinkling holes, and a liquid reagent and steam pass through the crushing and mixing shaft. The method comprises the following steps: preparation of a persulfate solution; preparation of hot steam; addition of soil; preliminary crushing and mixing; sprinkling of the persulfate solution; injection of the hot steam; up-and-down separation of a container; analysis of soil properties and sample acquisition; and data analysis. According to the invention, full mixing of the persulfate solution with contaminated soil is realized under the condition of low soil moisture content; and as steam is injected into soil for heating so as to realize activation of persulfate, restoration effects of activated persulfate on organic pollutants in soil are simulated.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a simulation test device and a simulation test method for activating advanced oxidation ectopic remediation of polluted soil by persulfate hot steam. Background technique [0002] With the acceleration of urbanization and industrial transfer, the number of polluted sites that have been relocated or left behind by urban industrial enterprises in my country is increasing day by day. According to preliminary estimates, there are at least hundreds of thousands of industrial pollution sites in my country. Urban polluted sites have become a limiting factor for the safe reuse of land resources in many large and medium-sized cities in my country. The research and practice of site contaminated soil remediation has become an important content in the field of environmental governance in my country. [0003] It is estimated that potential volatile organic ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 张长波杨洁罗启仕李青青李忠元王旌高洁喻恺朱悦郭琳
Owner 上海环境保护有限公司
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