Enriched biological post-treatment technique for renovation of heavy metal polluted soil with combined mushroom-plant

Abstract

The invention belongs to enrichment organism post treatment technology in the technical field of resource and environment to adopt mushroom fungus-plant for jointly renovating soil polluted by heavy metal. In the post treatment technology of the invention, plant corpus and mushroom fungus fruiting body enriched in heavy metal are collected; the plant corpus and mushroom fungus fruiting body are roughly ground according to a certain proportion to be used as fermentation material of methane and thrown into a methane tank for decrement by fermentation; the heavy metal in the methane liquid is removed by chemical precipitation, methane residue and heavy metal precipitation with concentrated heavy metal are intensively buried. In the invention, the methane tank is used as an organism decrement device, the characteristics of low cost, mature technology, easy promotion and high decrement rate of methane fermentation are adopted to carry out post treatment of biological concentration heavy metal without secondary pollution; the general effect is that enrichment organism decrement rate is 70-90% and removal rate of heavy metal in the enrichment organism is over 90%.

Description

Technical field: [0001] The invention belongs to the technical field of resources and environment, and specifically relates to the post-treatment technology of heavy metal-enriched plants and mushroom fruiting bodies. Background technique: [0002] With the acceleration of industrialization and urbanization in our country, the pollution of soil and water sources by heavy metals is becoming more and more serious. Among them, cadmium (Cd), lead (Pb), chromium (Cr), mercury (Hg), arsenic (As), nickel (Ni), copper (Cu), and zinc (Zn) are more common heavy metal pollution. The world's average annual emission of Hg is about 15,000 tons, Cu is 3.4 million tons, Pb is 5 million tons, Mn is 15 million tons, and Ni is 1 million tons. In my country, about 25 million hectares of farmland soil is polluted by heavy metals, and as many as 12 million tons of grain are polluted by heavy metals every year, causing direct economic losses of more than 10 billion yuan. [0003] Heavy metals ca...

AI Technical Summary

Problems solved by technology

Advantages of phytoremediation: easy planting, large enrichment, heavy metals in various soils can be removed, less soil fertility loss, and no damage to the basic soil structure; disadvantages of phytoremediation: long plant growth cycle, troublesome follow-up treatment (incineration is the main technology , but pollute the air)

[0008] The degradation rate of plants in biogas fermentation is slow and cannot be completely degraded

Because the plant body contains a large amount of cellulose and lignin, if the plant body is directly put into the biogas digester for reduction fermentation treatment, the decomposition of the plant body is slow, the utilization rate of raw materials is low, the fermentation reduction period is long (20-30 days), and the biogas residue is produced. High yield, prone to problems such as crusting, and at the same time, the carbon and nitrogen of the plant body is relatively large, the fermentation efficiency is low when used alone as raw material, and the biogas slurry is easy to acidify in the later stage of fermentation