Polluted soil in-situ circulation leaching treatment method adopting electrochemical treatment leacheate

Abstract

A contaminated soil in-situ circulation leaching treatment method adopting an electrochemical treatment leacheate comprises the following steps that firstly, an electrochemical reactor is arranged on a contaminated soil ground, the upper portion of the chemical reactor is open, the leacheate enters from the upper portion, and the upper portion of the chemical reactor is open; the bottom of the electrochemical reactor is communicated with a leacheate discharge pipe network arranged in the polluted soil through a discharge pipe; 2, after entering the contaminated soil, the leacheate absorbs pollutants in the soil and then is enriched in a water collecting well, and then the leacheate in the water collecting well is sent back into the electrochemical reactor through a sewage pump, so that circulation of the leacheate is achieved; and step 3, after the leacheate is circulated stably, electrifying the positive electrode plate and the negative electrode plate to enrich heavy metal ions in the leacheate and degrade organic pollutants so as to realize efficient circulating operation of the leacheate. The leacheate subjected to electrochemical treatment enters the leacheate discharge pipe network system below again, so that efficient cyclic utilization of the leacheate is realized.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, in particular to an in-situ cycle leaching treatment method for polluted soil using an electrochemical treatment eluent. Background technique [0002] In-situ leaching of polluted soil is carried out with water, and the pollutants attached to the surface of soil particles are transferred to the eluent to achieve the purpose of remediating polluted soil. This technology has been widely used due to its simple process and stable pollutant removal effect. However, in the in-situ leaching process, as the concentration of pollutants in the eluent increases, the mass transfer rate of the pollutants into the eluent will gradually decrease. The current soil leaching technology generally chooses a large area above the polluted soil Spraying eluent, the eluent obtained from the extraction well has more impurities, and it needs subsequent processing to obtain eluent that can be used for secondary ...

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Problems solved by technology

However, although there are filter tubes installed under the injection well of the extraction system and the extraction well of the eluent recovery system for preliminary filtration of organic contaminated soil, the service life of the filter tubes is short, which is not conducive to long-term soil remediation; pollution disposal Although the system has complete treatment facilities, it generally adopts physical treatment measures, which can realize the separation of oil and water in the eluent and the treatment of waste water and waste gas, but lacks a method that can realize rapid circulation of the eluent. Rapid Degradation Technology of Utilized Pollutants

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