Method and device for repairing contaminated soil with persistent organic pollutants

Abstract

The invention relates to a method for repairing contaminated soil, and aims at providing a method and a device for repairing contaminated soil with persistent organic pollutants. The device comprises a separator, a material hopper, a material feeder and an indirect-heating thermal desorbing device which are connected with one another in sequence, wherein a soil emission device is connected to the bottom of the heating thermal desorbing device; a combustion system, a waste heat utilization device and an inert gas generator are respectively connected with the indirect-heating thermal desorbing device; the combustion system is connected with an outer barrel, and the inert gas generator is connected with an inner barrel; and a tail gas processing component comprises a cyclone dust extractor, a primary spray tower, a secondary regulating spray tower, a dehumidifier, a plasma reactor, an air filter, an induced draft fan and an exhaust barrel which are connected with one another in sequence. According to the method and the device for repairing contaminated soil with persistent organic pollutants disclosed by the invention, the amount of exhaust gas needing processing is less, water consumption is low, the persistent organic pollutants are thoroughly removed, the operation cost is reduced by 30%-60%, and the contaminated soil with persistent organic pollutants can be economically and effectively processed.

Description

technical field [0001] The invention relates to a set of persistent organic pollutant polluted soil remediation method and device. The persistent organic pollutants in the soil are desorbed through an indirect heating thermal desorption system, and the persistent organic pollutants in the soil are desorbed through a cyclone dust collector, a two-stage spray tower, and a plasma Reactors and other tail gas treatment components capture or degrade persistent organic pollutants, which belong to the field of environmental protection. Background technique [0002] Persistent Organic Pollutants (POPs) are highly toxic, persistent, easy to accumulate in organisms, and carry out long-distance migration and deposition. Some POPs are also carcinogenic and teratogenic. The main POPs are dioxins, polychlorinated biphenyls, organochlorine pesticides, hexachlorobenzene, etc. A large amount of soil in my country has been polluted by persistent organic pollutants, such as polychlorinated bip...

AI Technical Summary

Problems solved by technology

There are two main defects of the incineration method: one is that the structure of the incineration equipment is complicated, the construction cost is high, and the operation cost is high, and it does not have good economy under the current high energy price; the other is that some processes have low purification efficiency and are prone to produce The problem of secondary pollution; these limit the scope of use and large-scale promotion of the incineration method

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