Method for treating soil heavy metal combined pollution

A technology for compound pollution and heavy metals, applied in the field of environmental pollution and treatment, can solve the problems of no compound pollution method, difficult to maintain growth state, intolerance of earthworms, etc., and achieves good growth effect, good absorption effect, and reduced The effect of human and material resources

Inactive Publication Date: 2010-08-11
SUN YAT SEN UNIV
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AI Technical Summary

Problems solved by technology

However, at present, these applications are only in the stage of indoor experiments and small-scale field demonstration experiments, as well as the stage of mechanism research, and there is no mature and comprehensive method for remediating the complex pollution of various heavy metals in soil.
Patent 200410027833.3 By planting small flying grass and ramie in the soil, and inoculating metal-activated bacteria, it is found that when the three exist at the same time, the absorption capacity of lead and cadmium in the soil can be improved, but this technology is only for the restoration of soil lead and cadmium , and the operating conditions are rel...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Retrieve the soil from the polluted site in the wild, and grind it for later use. Before planting plants, it was measured that the soil moisture content was 10%, and the contents of heavy metals As, Cd, Cu, Pb and Zn in the soil were 556mg kg respectively -1 , 50 mg kg -1 , 904 mg kg -1 , 1,384 mg kg -1 and 1,767mg kg -1 . 10 plants of ramie were planted per square meter, and the aerial parts of ramie were harvested after 3 months.

[0026] Restoration results: the aboveground biomass of ramie per square meter is 300g, and the content of heavy metals As, Cd, Cu, Pb and Zn in ramie is 10.2mg kg -1 , 1.5 mg kg-1 , 22.1 mg kg -1 , 93.5 mg kg -1 , 175.3 mg kg -1 .

[0027] Harvest three times a year, and after 6 consecutive harvests, the aboveground part of ramie per square meter will maintain 600-720g of organisms, and the heavy metals in the soil will continue to decrease.

Embodiment 2

[0029] The soil used is as in Example 1, but earthworms are introduced, and an appropriate amount of water is added to the soil before to make the water content reach 20%; it is divided into three experimental groups, and 10,000 earthworms / ha and 20,000 / ha are introduced respectively. Or 30,000 strips / ha. 10 plants of ramie were planted per square meter, and the aerial parts of ramie were harvested after 3 months.

[0030] Restoration results: the above-ground biomass of ramie per square meter were 340g, 450g and 460g respectively. Compared with Example 1, the biomass increased by 13.3%, 50% and 53% respectively. The content of heavy metal As, Cd, Cu, Pb and Zn of ramie has promotion compared with the processing of embodiment 1, and average value is 14.2mg kg -1 , 1.6 mg kg -1 , 23.2 mg kg -1 , 102.3 mg kg -1 , 180.2 mg kg -1 .

[0031] After continuous harvesting for 4 times, the aerial parts of ramie per square meter were biologically maintained at 900-1050g. The int...

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Abstract

The invention relates to a method for treating soil heavy metal combined pollution. Simultaneously the earthworms are bred and the ramie is planted in the soil. The part of the ramie on the ground is regularly harvested in the planting process of the ramie and the underground part of the ramie continuously grows so as to circularly harvest the part on the ground. The introduction amount of the earthworms is over 10,000. A repair method provided by the invention can realize the repair for the combined pollution of various heavy metals in the soil. Moreover, the method can maintain the long-term continuous plant in-situ growth repair. The used economic crops also can produce great economic value, cannot generate secondary pollution by the food cycle, achieves the win-win aim of the environmental effect and the economic benefit and is easy to popularize and use.

Description

technical field [0001] The invention relates to the field of environmental pollution and treatment, in particular to a method for remediating soil heavy metal compound pollution. Background technique [0002] Heavy metals and their compounds are well-known "three substances", namely teratogenic, carcinogenic and mutagenic. Under natural conditions, heavy metals in soil will not be degraded by organisms, and their retention time may even exceed one thousand years. Heavy metals, especially cadmium, lead, and zinc are highly toxic, which will inhibit the growth of soil microorganisms, disrupt the ecological balance, and cause soil degradation and insufficient fertility. What's more serious is that about 18.5% of the pollutant content of agricultural products exceeds the health standard. In some vegetables and other crop products in Guangdong Province, the heavy metal content has been detected to exceed the standard, which greatly limits the pollution-free food, green food, Th...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 杨兵叶志鸿周密束文圣蓝崇钰
Owner SUN YAT SEN UNIV
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