Experimental facility and method for remediating saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source based on zero-valent iron-PRB reduction

Abstract

The invention relates to an experimental facility and method for remediating a saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source based on zero-valent iron-PRB reduction. The experimental facility comprises a water supply device, a cylinder simulator, a sampling device and a waste liquid collecting device which are sequentially connected. According to the method, specific to pollution caused by the saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source, a zero-valent iron-PRB is mounted near the pollution source, reductive degradation is carried out on a dissolved-state DNAPL ingredient flowing through a wall body, and the saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source is remediated. Simulation experiments show that dissolution rate of the DNAPL pollution source can be increased by mounting the zero-valent iron-PRB near the pollution source, existence time of the saturated water-bearing layer chlorinated hydrocarbon DNAPL pollution source in an underground environment is shortened, and a design thought and key technical parameters are provided for study of in situ chemical reduction remediation.

Description

technical field [0001] The invention relates to the field of soil and groundwater pollution remediation, in particular to an experimental device and method for remediating saturated aquifer chlorinated hydrocarbon DNAPL pollution sources based on zero-valent iron-PRB reduction. Background technique [0002] As an important industrial raw material, Dense non-aqueous phase liquid (DNAPL) is widely used in the fields of agriculture, fuel, and medicine, and it is easy to leak and discharge during production, transportation, storage, and use, resulting in a large amount of DNAPL. Enter the underground environment. This part of the DNAPL entering the underground environment can continuously migrate to the soil and groundwater under the action of gravity, and accumulate in the impermeable or impermeable layer to form a DNAPL pool, thereby slowly and continuously releasing pollutants to the underground environment, forming a persistent Sources of contamination, the remediation of w...

AI Technical Summary

Problems solved by technology

But currently about Fe 0 The research on the removal of DNAPL pollution sources mainly focuses on nano-ZVI and its binary loading system, and does not turn the perspective to the ZVI-PRB system with high engineering application value. The smaller the particle size of ZVI, it can participate in the degradation of pollutants. The larger the effective specific surface area of ​​the reaction is, but in actual engineering applications and laboratory simulation experiments, the specific gravity difference between powdered zero-valent iron and quartz sand is very difficult to mix evenly, so the application of powdered zero-valent iron is less

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