Post evaluation system for polluted soil remediation

Abstract

The invention discloses a post evaluation system for polluted soil remediation. The system is provided with six independent reaction kettles, and temperature sensors, conductivity electrodes, pH electrodes and redox potential electrodes are arranged in grooves in the reaction kettles, so that internal precise temperatures in the reaction kettles are accurately controlled; furthermore, test analysis and dynamic monitoring on multiple test samples and multiple parameters can be simultaneously performed, so that parallel test errors are reduced, and the test period is shortened; the conductivity electrodes, high-temperature-resistant and acid-alkaline-corrosion-resistant electrodes are adopted for the pH electrodes and the redox potential electrodes, so that the durability and the detection accuracy of equipment are greatly improved; hollow meshed test sample tables are arranged at the bottom parts of the reaction kettles so that a requirement for a relevant leaching test standard is met. The system integrates testing and dynamic monitoring; the aim of post evaluation is fulfilled by performing accelerated corrosion test and analysis on remediated polluted soil under conditions of high temperature, high pressure, high rotating speed and high concentration.

Description

technical field [0001] The invention discloses a post-remediation evaluation system for polluted soil, which belongs to the post-remediation evaluation equipment category. Background technique [0002] According to the National Soil Pollution Survey Bulletin issued by the Ministry of Environmental Protection, the overall soil environment in the country is not optimistic. Some areas have serious soil pollution, the soil environment quality of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. Man-made activities such as industry, mining, agriculture, and high background values ​​of the soil environment are the main causes of soil pollution or exceeding standards. The total over-standard rate of soil in the country was 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites were 11.2%, 2.3%, 1.5% and 1.1%, respectively. Inorganic pollutants are the main type of pollution, follow...

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Problems solved by technology

However, the current effectiveness of solidification / stabilization treatment of heavy metal-contaminated soil is mainly based on the verification of the short-term leaching toxicity of the solidification body, while there is little research on the long-term leaching characteristics of heavy metals in the solidification body, which shows the long-term environmental risks of solidification / stabilization technology To be verified, this is the only flaw of curing / stabilizing technology

[0004] Evaluating the long-term environmental risk of the solidified body through the field test is not only difficult to operate and expensive, but also the test period is too long, which cannot meet the urgency of the long-term environmental risk of the solidified body at this stage. Therefore, the heavy metal-contaminated soil solidified body accelerates corrosion The test is the most effective and economical choice to evaluate the long-term environmental risk of the solidified body in the short term, and it is also one of the most forward-looking methods for evaluating the remediation of heavy metal contaminated soil

[0005] At present, the typical equipment for accelerated corrosion test is the dynamic corrosion instrument, but the current dynamic corrosion instrument has the following defects: 1) The current dynamic corrosion instrument is mainly aimed at the determination of the corrosion rate of rock and metal test pieces, and has not yet targeted at heavy metal pollution. Experimental equipment suitable for the accelerated corrosion test of solidified soil; 2) The current dynamic corrosion instrument only has one reactor. In the actual operation process, under most test conditions, only one sample can be tested at a time, and the test cycle is long when parallel testing is performed. , and it is difficult to control the error between different parallel experiments; 3) The current temperature sensors for reactor control and the temperature inside the reactor are mostly located between the outer wall of the reactor and the heating plate, which cannot correctly reflect the real temperature of the solution in the reactor ;4) There is no monitoring device for internal samples and corrosion solutions in the reactor, and it is impossible to monitor the changes of samples and solutions inside the reactor in real time during the dynamic corrosion process

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