Indirect thermal desorption restoration system and method for treating mercury-containing solid waste and soil

Abstract

The invention provides an indirect thermal desorption restoration system and method for treating mercury-containing solid waste and soil. The system comprises a feeding unit, a thermal desorption unit, a high-temperature dust removal unit, a tail gas treatment unit, a technological water treatment unit and a discharging unit; the thermal desorption unit is separately connected with the feeding unit, the high-temperature dust removal unit and the discharging unit, the high-temperature dust removal unit is connected with the tail gas treatment unit and the discharging unit, and the technologicalwater treatment unit is connected with the tail gas treatment unit. The system is high in treatment capability, high in mercury and mercury compound removal rate, and convenient to transport and install; and moreover, the system can flexibly control the thermal desorption temperature and retention time of the mercury-containing material, sufficiently utilizes the system waste heat and the up-to-standard water after being treated, can efficiently and economically restore the mercury polluted material, can maximally recovery the mercury element, and can realize the purpose of recycling the waste water after reaching the standard and discharging the tail gas up to standard.

Description

technical field [0001] The invention relates to an indirect thermal desorption restoration system and method for mercury-containing solid waste and soil treatment, and belongs to the technical field of mercury-containing solid waste and soil indirect thermal desorption restoration system and restoration method. Background technique [0002] The chlor-alkali industry is an important chemical production field in my country. Its products involve almost all fields of the national economy and people's lives, and occupy a very important and basic position in the entire national industrial system. [0003] The remediation technologies of mercury pollution in soil mainly include solidification stabilization technology, soil leaching technology, phytoremediation technology, thermal desorption technology, etc. Among them, thermal desorption technology is considered to be one of the best technologies for treating high-concentration mercury-containing solid waste and soil due to its sho...

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Problems solved by technology

Although this invention is designed for mercury-contaminated soil, its treatment method is more suitable for soil polluted by elemental mercury, not for soil polluted by high-concentration mercury compounds

The sewage treatment process described in this invention still needs to be perfected, and it is difficult to remove the ionic mercury in the waste water and then reach the reuse standard only through mud-water separation and quartz sand filtration

[0006] At present, there is no large-scale high-concentration mercury-contaminated site remediation project implemented in China. Most of the existing mercury thermal desorption processes and devices are in the pilot test stage and have not been industrialized. Production and application have certain limitations.

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