A persulfate method for in-situ remediation of soil persistent organic pollutants

Abstract

The invention discloses an in-situ restoration method for soil persistent organic pollutants by a persulfate method, and relates to the technical field of soil restoration. The steps are: collecting soil column samples for analysis, determining the soil permeability coefficient and the pollution depth and concentration of target pollutants, determining the depth and layout of the injection wells, drilling the injection wells, and preparing persulfate and composite activator coatings. Colloidal nitrogen bubbles, colloidal air bubbles wrapped with air, and determine the injection volume; use a high-pressure pump to inject an emulsion with a given dose of colloidal nitrogen bubbles and colloidal air bubbles suspended in the drug injection well, and the injection is completed Finally, the ultrasonic instrument is used to break the colloidal nitrogen bubbles and colloidal air bubbles dispersed in the soil, activate the oxidant, and restore the soil persistent organic pollutants in situ. The invention has the advantages of high treatment efficiency, short cycle, simple follow-up treatment, uniform medicament distribution, clear targeting, reduced medicament dosage, greatly improved restoration efficiency, less environmental side effects, economical and environmental protection, and broad application prospects.

Description

technical field [0001] The invention relates to a soil remediation method, in particular to a persulfate method for in-situ remediation of soil persistent organic pollutants, and belongs to the technical field of soil remediation. Background technique [0002] Persistent organic pollutants (POPs) are a class of chemicals that can persist in the environment for a long time and pose a serious threat to humans, animals and plants, with long-term residual, bioaccumulation, semi-volatile and high toxicity. There are many important classes of POP chemicals, including PCBs, furans, and different organochlorine pesticides. At present, the organic pollution of soil in my country is very serious, and the impact on agricultural products and human health has begun to appear. [0003] At present, the treatment of POPs-contaminated soil is mainly physical method, chemical method and bioremediation method. Among them, microorganisms in bioremediation have poor mobility in soil, are easil...

AI Technical Summary

Problems solved by technology

(1) In-situ remediation technology: it can remediate deeply polluted soil, and its characteristics are: economical and effective, on-site disposal, degradation and attenuation of pollutants, without the need to build expensive ground environmental engineering infrastructure and long-distance transportation, The operation and maintenance are relatively simple, but there are also some disadvantages such as low processing efficiency, easy to produce secondary pollution, and long processing cycle.

(2) Ex-situ remediation technology: it can only be repaired on surface-contaminated soil. Features: lower environmental risk, more predictable system treatment than in-situ remediation, strong pertinence, less chemicals consumed compared with in-situ remediation However, it needs to consume a lot of manpower and financial resources for transportation, and during the transportation process, it will also bring certain threats to the surrounding environment, and the ectopic repair equipment currently on the market is generally expensive and occupies a very large area. Large, location is also more difficult

[0005] Therefore, in view of the shortcomings of the existing soil persistent organic pollutant remediation methods, such as low treatment efficiency, long cycle, easy to produce secondary pollution, complicated follow-up treatment, uneven mixing of chemicals and target pollutants, and a large excess of chemicals, a design was designed. It is especially necessary to plant persulfate method for in-situ remediation of soil persistent organic pollutants

Images