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

A combined repair and polluted soil technology, applied in the field of resources and environment, can solve problems such as follow-up processing troubles, polluted air, slow degradation of plants, etc.

Inactive Publication Date: 2009-07-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 dire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This example adopts the method of biogas fermentation to reduce the amount of cadmium (Cd), lead (Pb), copper (Cu) enriched plant scallops and enriched microorganisms such as Agaricus bisporus, Coprinus macrosporum, Coprinus comatus, and Stropharia stropharii . The mass (wet weight) ratio of plants and mushrooms is about 1:1 or 2:1 or 1:2.

[0025] The processing process in this example: Harvesting of kale and Agaricus bisporus → Roughly crushing the fruiting bodies of kale and Agaricus bisporus with simple machinery → Simple treatment of culture material before biogas fermentation → Proportion of kale and Agaricus bisporus (wet weight, the same below) 1:1 or 2:1 or 1:2 mixing → fermented material put into biogas digester → enrichment organism fermentation reduction treatment → separation of biogas residue and biogas slurry after biogas fermentation treatment → adding chemical chelating agent, flocculant or biogas slurry The precipitant precipitates heavy metals → heav...

Embodiment 2

[0038] In this example, biogas fermentation is used to treat cadmium, lead, and copper-enriched plant Indian mustard and mushrooms such as Agaricus bisporus, Coprinus comatus, and Stropharia, which absorb heavy metals. The mass (wet weight) ratio of Indian mustard and mushroom is about 1:1 or 2:1.

[0039] The processing process in this example: Harvesting Indian mustard and mushrooms → roughly crushing the fruiting bodies of Indian mustard and Agaricus bisporus with simple machinery → Simple treatment of compost before biogas fermentation → Ratio (wet weight) of Indian mustard and Agaricus bisporus 1:1 or 2 : 1 mixing→fermentation material put into biogas digester→enrichment organism fermentation reduction treatment→separation of biogas residue and biogas slurry after biogas fermentation treatment→adding chemical chelating agent, flocculant or precipitant to the biogas slurry to precipitate heavy metals→heavy metal precipitation and biogas Concentrated slag landfill → dischar...

Embodiment 3

[0045] This example uses the biogas fermentation method to enrich the heavy metals such as lead (Pb), chromium (Cr), copper (Cu), zinc (Zn) such as Chinese cabbage and Agaricus bisporus, Coprinus spores, Coprinus comatus, Stropharia stropharia, etc. Mushroom. The mass (wet weight) ratio of Chinese cabbage and mushroom is about 1:1 or 2:1.

[0046] The treatment process in this example: Harvesting Chinese cabbage and mushrooms → roughly crushing Chinese cabbage plants and mushrooms by simple machinery → simple treatment of compost before biogas fermentation → the proportion (wet weight) of Chinese cabbage and mushrooms is 1:1 or 2 : 1 mixing→fermentation material put into biogas digester→enrichment organism fermentation reduction treatment→separation of biogas residue and biogas slurry after biogas fermentation treatment→adding chemical chelating agent, flocculant or precipitant to the biogas slurry to precipitate heavy metals→heavy metal precipitation and biogas Concentrated ...

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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...

Claims

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Application Information

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IPC IPC(8): C12P5/02B09C1/00B09C1/10C12R1/645
CPCY02E50/343Y02E50/30Y02P20/133
Inventor 徐恒冯军黄海燕王德胜袁恬戴九洲陈兰
Owner SICHUAN UNIV
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