Device for remediating selenium contaminated soil

Abstract

The invention discloses a device for remediating selenium contaminated soil. The device for remediating selenium contaminated soil comprises a water collection tank, a plurality of water collection gutters, a selenium contamination treatment well, immobilized microorganism balls, a magnetic field generation device, a water pump and water spraying pipes. The water collection tank communicates with the water collection gutters. The selenium contamination treatment well sequentially comprises a gravel layer, an artificial matrix layer and an immobilized microorganism layer from bottom to top. The artificial matrix layer is composed of quartz sand and limestone. The immobilized microorganism balls are placed in the immobilized microorganism layer and made from activated sludge, activated carbon and metallic nickel, and the activated sludge mainly contains microorganisms addicted to selenium. A water outlet pipe is connected into the water collection tank and connected with the gravel layer of the selenium contamination treatment well. A filter screen is arranged between the artificial matrix layer and the immobilized microorganism layer. A water purifying pipe is arranged in the immobilized microorganism layer and connected with the water pump. The water pump is connected with the water spraying pipes. The water spraying pipes are evenly distributed on the surface of soil. By the adoption of the device for remediating selenium contaminated soil, selenium in soil can be removed, and water recycling is achieved.

Description

technical field [0001] The invention relates to the field of soil improvement, in particular to a device for repairing selenium polluted soil. Background technique [0002] Selenium is a non-metallic element and an essential trace element for humans and animals. Trace amounts of selenium can prevent cancer and protect the liver. However, if the body absorbs too much selenium, it will cause poisoning and cause gastrointestinal disorders. In addition, selenium will also cause certain pollution to the air, water and soil. [0003] Selenium pollution to the soil, selenium can be enriched in the soil and absorbed by crops. Irrigate the farmland with water with a selenium content greater than 0.05ppm, and the selenium content per kilogram of feed crops can reach 4-5 mg. South Dakota and Wyoming in the United States are areas rich in selenium and iron. The selenium content of some pastures' feed is as high as 30 mg per kilogram. For the protection of the environment, it is nece...

AI Technical Summary

Problems solved by technology

However, if the body absorbs too much selenium, it will lead to poisoning and cause gastrointestinal disorders.

In addition, selenium will also cause certain pollution to the air, water, and soil.

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