Heavy metal polluted soil using chelant reinforced mushroom

Abstract

The invention belongs to technology for remediating heavy metal polluted soil by chelon strengthened mushrooms in the technical field of resource and environment. The technology is to plant the mushrooms on the polluted soil and apply chelon after the mushrooms are covered with earth so as to strengthen the adsorption rate and capacity of the mushrooms to the heavy metals in the soil. The ripe mushrooms are adopted and put into a marsh gas tank for decrement treatment; marsh gas sewage and marsh gas residue are obtained after decrement; the heavy metals are precipitated from the marsh gas sewage by chemical precipitation or chelation precipitation (specifically referring to passivating the chelon); and the precipitated marsh gas sewage can be drained after being detected to reach the standard, and heavy metal precipitation and the marsh gas residue are concentratedly buried in a controllable mode. The technology takes the mushrooms as a biological concentration machine, fully utilizes the characteristics of strong capacity of enriching heavy metal ions and short growth cycle of the mushrooms, and combines the powerful function of the chelon to activate the heavy metals so as to achieve higher-efficiency remediation effect. The post-treatment adopts the methods such as the chemical precipitation, the chelation precipitation and the like to radically remove the heavy metal ions, and the annual heavy metal pollution clearance rate for a plough horizon can reach 10 to 20 percent.

Description

Technical field: [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a technology for strengthening mushrooms with chelating agents to restore heavy metal-contaminated soil. Background technique: [0002] Soil is an important natural resource for human beings to survive, and it is also an important component of the human living environment. However, with the sustained and rapid development of my country's social economy, the problem of soil heavy metal pollution has become increasingly serious, including cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), zinc (Zn), mercury (Hg), arsenic ( As), nickel (Ni) and so on are more common heavy metal pollution. On average, 3.4 million tons of Cu, 5 million tons of Pb, about 15,000 tons of Hg, 15 million tons of Mn, and 1 million tons of Ni are discharged every year in the world. The massive discharge of these heavy metals seriously pollutes the environment. In my country,...

AI Technical Summary

Problems solved by technology

Advantages of phytoremediation: easy planting, large enrichment, heavy metals in the soil can be removed; disadvantages of phytoremediation: long plant growth cycle (1 year for herbs, 3-5 years for woody plants, seriously affecting agricultural production), troublesome follow-up treatment (incineration It is the main technology, but it pollutes the air) and the plants are not easy to rot, so that the existing phytoremediation technology actually only plays a role in enriching and concentrating heavy metal ions in the soil. After the heavy metal ions are absorbed and transported from the soil to the plant, although the soil However, the heavy metal ions have not been completely removed from the environment, and they still exist in the plants in the environment. Whether it is burned or decayed, the heavy metal ions enriched in the plants will return to the environment or soil. The role of pollution transport to other areas

For those polluting elements that are extremely difficult to move, such as Pb, Cu, and Au, without adding chelating agents to release the metals in the solid phase for absorption by mushroom hyphae, it is difficult to achieve the best effect in mushroom restoration.