System and method for treating heavy metal pollution of soil

Abstract

The invention relates to a system and method for treating heavy metal pollution of soil. The system comprises soil washing equipment, a mixing pipe, a contact reactor and a catalyst tank which are sequentially connected; a first circulating hole and a second circulating hole are respectively formed in the upper and lower parts of the catalyst tank; the first circulating hole is respectively connected with an outlet of the contact reactor and a backwash liquid outlet pipe by a first valve and a second valve; the second circulating hole is respectively connected with a water outlet pipe and a backwash water inlet pipe by a third valve and a fourth valve; and a packing layer is arranged inside the catalyst tank and is filled with spherical particles with manganese dioxide coatings. The system and method are capable of comprehensively treating heavy metal pollution, parts of VOCs and other soil pollution at one step, greatly lowering the treatment difficulty, greatly shortening the process flow and greatly reducing the floor area, simpler in operation, extremely wide in pollutant removal range and extremely good in removal effect.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a system and method for remediating soil heavy metal pollution. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in April 2014, the overall situation of the national soil environment is not optimistic. protrude. The pollution types are mainly inorganic, mainly including chromium, cadmium, mercury, arsenic, lead, copper, zinc, nickel and so on. Soil pollution not only causes serious harm to the ecological environment and human health, but also hinders the development of my country's economy. [0003] The distribution of heavy metal soil pollution is wide, the amount of pollution is large, and the cost of treatment is high, and the treatment cycle is long. Chemical leaching technology is an effective technology to control soil heavy metal pol...

AI Technical Summary

Problems solved by technology

Because the amount of earthwork for general soil remediation is very large, often hundreds of thousands, millions, or even tens of millions of cubic meters, the proportion of eluent is generally about 8 times the amount of earthwork. Whether it is network or alkali precipitation, it is necessary to build a network breaking tank and a sedimentation tank (primary settling tank, secondary settling tank), which requires a lot of manpower, material resources, and financial resources, and the project cycle is also greatly lengthened, which is not suitable for market applications.

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