Leaching apparatus for arsenic-contaminated soil and treatment method for arsenic-contaminated soil

Abstract

The invention provides a leaching apparatus for arsenic-contaminated soil and a treatment method for the arsenic-contaminated soil. The leaching apparatus comprises a leaching container. The leaching container comprises, from top to bottom, a leaching liquid storage chamber, a first filter layer, an arsenic-contaminated soil layer, a second filter layer, a barrier material layer and a third filter layer. The bottom side surface of the leaching container is provided with a lower-end water outlet, and the top side surface of the leaching container is provided with an upper-end water outlet; the lower-end water outlet is connected with the upper-end water outlet through a connecting pipe; a pump is arranged at the middle of the connecting pipe to pump a leaching liquid flowing out from the lower-end water outlet to the upper-end water outlet; and a valve is arranged at the upper-end water outlet. The leaching apparatus employs a single loop structure, and separation of heavy metals from the soil and purification and cyclic utilization of the leaching liquid are realized through effective combination of a soil leaching system, a leaching liquid safe treatment system and a leaching liquid circulating system.

Description

Technical field [0001] The invention relates to the field of ecology and environmental protection, in particular to an arsenic-contaminated soil leaching device and a disposal method for arsenic-contaminated soil. Background technique [0002] The abundance of arsenic in the crust ranks 20th, with a content of 4.01×10 16 kg. The average arsenic concentration in the world's soil is 6mg / kg, while in my country it is 11.2mg / kg. Due to the widespread existence and use of arsenic, arsenic pollution has occurred in many countries. my country is a major mining country. Arsenic mines are widely distributed in the central and southwestern provinces of Hunan, Yunnan, Guangxi, Guangdong and other provinces. The mining or smelting of arsenic-bearing mines in these areas can easily cause nearby soil pollution. According to incomplete statistics, between 1956 and 1984, there were more than 30 incidents of arsenic pollution poisoning. In addition, arsenic ranks fifth among soil pollution cau...

AI Technical Summary

Problems solved by technology

Therefore, there are several key issues for the leaching agent as follows: (1) The type selection of the leaching agent is the key to the leaching technology: different leaching agents have great differences in the extraction ability of pollutants in the soil

(3) Treatment of eluent: the traditional eluent treatment method usually consumes a large amount of eluent, and this method only transfers pollutants into the eluent to a certain extent, so it is necessary to Treatment and recycling, otherwise the advantages of the soil leaching method will be difficult to play

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