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

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 ...

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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 metals, and it is usually necessary to add alkaline substances again to adjust the acidity and alkalinity of the soil

However, when implementing soil remediation projects, it is often impossible to add a large amount of water to the soil to form mud, because the mud is not conducive to the subsequent transportation and resource utilization process, and at the same time causes a waste of resources; due to the huge amount of soil, water baths cannot be used Pot form to heat the soil

This caused the inconsistency between the laboratory simulation test and the scene and parameters of the on-site restoration project, which greatly limited the universality and accuracy of the test parameters.

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