Method for repairing heavy metal polluted soil of farmland with combination of crop rotation of grassiness and fungus

A technology of polluted soil and joint restoration, applied in the field of resources and environment, to achieve the effect of short growth cycle, large biomass and strong ability

Inactive Publication Date: 2009-04-08
成都市龙泉驿区农村发展局 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the deficiency of plants and fungi for repairing heavy metal-contaminated soil alone, through the joint planting of elephant grass and fungus in rotation, improve the efficiency of biological associations in removing heavy metals from soil, and provide a method for on-site repair of heavy metal-contaminated farmland soil. Elephant grass-fungus joint restoration technology with short period, easy implementation, environmental protection and saving

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, elephant grass is planted on contaminated soil containing cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), and zinc (Zn). After 6 to 8 months, elephant grass matures, and bisporus is rotated. Mushroom (Agaricus bisporus) enriches these five heavy metal ions in soil by joint.

[0030] Restoration process: Elephant grass planting → Field management after Elephant grass planting → Preparation, fermentation and germination of Agaricus bisporus base material → Harvesting Elephant grass → Soil-covered mushrooms of Agaricus bisporus → Harvest mature mushroom body → Mushroom body and Elephant grass specific Proportionally put into the biogas digester for bioreduction and fermentation to produce biogas→biogas slurry adopts chemical precipitation method to precipitate heavy metals→the precipitated biogas slurry is discharged after being tested to meet the standard, and heavy metal precipitation and biogas residue are controlled and centralized landfill treatme...

Embodiment 2

[0042] In this example, elephant grass is planted on the polluted soil containing copper (Cu), zinc (Zn) and chromium (Cr). After 6 to 8 months, the elephant grass matures, and then the golden blessing mushroom (Tricholoma giganteum Massee) is planted in turn to enrich the soil. The three heavy metals in the polluted soil were collected. Cultivated according to general conditions, it can reach 8000kg of fresh material per mu and 3200kg of fresh mushrooms. Harvested golden blessing mushrooms and elephant grass were put into biogas digesters at a ratio of 3:5 for anaerobic reduction fermentation treatment.

[0043] Restoration process: Elephant grass planting → Elephant grass field management → Preparation, fermentation and germination of golden blessing mushroom culture material → Elephant grass harvesting → Golden blessing mushroom debagging and covering with soil → Harvesting mature mushroom body → Subsequent treatment.

[0044] 1. Elephant grass planting technology is as em...

Embodiment 3

[0051] In this example, elephant grass is planted on contaminated soil containing cadmium (Cd), copper (Cu), and zinc (Zn). After 6 to 8 months, the elephant grass matures, and then the stropharla rugoso annulata is planted in rotation. These three kinds of heavy metals are enriched in the soil. After 2 to 3 months of planting, the stropharia stropharia matures. According to the general conditions of cultivation, the yield per mu can reach 8000kg of fresh grass and 2800kg of fresh mushrooms. Harvested Stropharia grandis and Elephant grass were put into biogas digesters at a ratio of 3:5 for anaerobic reduction fermentation treatment.

[0052] Restoration process: Elephant grass planting → Elephant grass field management → Preparation of stropharia compost, fermentation and fungal growth → Elephant grass harvesting → Covering soil and fruiting → Harvesting mature mushroom bodies → Subsequent processing.

[0053] 1. Elephant grass planting technology is as embodiment one.

[00...

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PUM

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Abstract

The invention belongs to an elephant grass-mushroom fungus crop rotation combined recovery technique for heavy metal polluted soil of farmlands in the technical field of resources and environment, which comprises the following steps: elephant grasses and mushroom fungi are planted by means of crop rotation on the polluted farmlands to enrich heavy metal ions in the soil; when the elephant grasses and the mushroom fungi in the treated lands are mature, the elephant grasses and mushroom fungi are harvested respectively and thrown into a biogas tank according to a specific proportion of the elephant grasses and mushroom fungi for bio-decrement and fermentation production of biogas; a biogas liquid undergoes chemical precipitation, and the heavy metal ions in the biogas liquid are removed; and deposits and biogas residues are accumulated and buried. The elephant grasses have the characteristics of strong capacity of enriching the heavy metal ions, large biomass and promotion of the growth of the mushroom fungi; the mushroom fungi have the characteristics of strong capacity of enriching the heavy metal ions, short growth cycle and easy after-treatment; when the elephant grasses and the mushroom fungi are combined to recover the heavy metal polluted soil, high recovery efficiency can be achieved; the chemical precipitation method in the subsequent treatment can eliminate heavy metal environmental pollution fundamentally; and the overall recovery effect of elephant grass-mushroom fungus crop rotation combined recovery technique is as follows: 15 to 30 percent of polluted heavy metals in cultivated horizons of the farmlands are removed each year.

Description

Technical field: [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for joint crop rotation of elephant grass and several kinds of mushrooms to repair farmland heavy metal polluted soil. Background technique: [0002] The development of industry and agriculture and the acceleration of urbanization have made the problem of soil heavy metal pollution increasingly prominent, including cadmium (Cd), lead (Pb), chromium (Cr), mercury (Hg), arsenic (As), nickel (Ni), copper (Cu), zinc (Zn) and so on are more common heavy metals polluting. The global 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, which seriously damages the ecological environment balance and the sound development of agricultural economy. [0003] At present, the farmland soil polluted by heavy metals in my country is about 2500×10 4 Hectares, as m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10B09B5/00
Inventor 唐敦义邓家玉姬凌云敬小兵田秀丽袁恬徐恒
Owner 成都市龙泉驿区农村发展局
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