Multi-functional composite conditioner for controlling cadmium-polluted soil and remediation method for soil cadmium pollution

A cadmium-contaminated soil, multi-functional technology, applied in the restoration of contaminated soil, etc., can solve the problems of reducing soil soluble phosphorus content, unsatisfactory passivation effect, phosphorus eutrophication, etc., to improve the utilization rate of materials, The effect of reducing costs and increasing economic benefits

Inactive Publication Date: 2014-02-12
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, since the degree of cadmium pollution is increasing year by year, the amount of a single passivating agent that needs to be added is also greater. For example, when using a cadmium phosphate p

Method used

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  • Multi-functional composite conditioner for controlling cadmium-polluted soil and remediation method for soil cadmium pollution
  • Multi-functional composite conditioner for controlling cadmium-polluted soil and remediation method for soil cadmium pollution
  • Multi-functional composite conditioner for controlling cadmium-polluted soil and remediation method for soil cadmium pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The formula combination of the multifunctional compound conditioner for controlling cadmium-contaminated soil is as follows:

[0029] T1 red mud + rape straw + zinc sulfate; weight ratio 1:0.5:0.02.

[0030] T2 red mud + cabbage plant residue + zinc sulfate; weight ratio 1:1:0.01.

[0031] T3 red mud + garlic plant residues + zinc sulfate; weight ratio 1:0.8:0.004.

[0032] T4 zeolite + rape straw + zinc sulfate; weight ratio 1:0.6:0.008~0.02.

[0033] T5 zeolite + cabbage plant residue + zinc sulfate; weight ratio 1:0.8:0.02.

[0034] T6 zeolite + garlic plant residue + zinc sulfate; weight ratio 1:0.5:0.015.

[0035] The soil used in this example is brown fluvo-aquic soil taken from the Changping Experimental Station of the Chinese Academy of Agricultural Sciences and passed through a 2mm sieve. Artificially set the cadmium pollution level as 2mg.kg -1 Cd, after about 30 days of aging in equilibrium culture, it is ready for use.

[0036] Spinacia oleracea L.cv.H...

Embodiment 2

[0043] The material used in embodiment 2

[0044] The soil used in this example is calcareous (pH 8.9) soil obtained from Ling County, Dezhou, Shandong, and passed through a 2mm sieve. Add exogenous cadmium (CdSO 4 ), the concentration is 1.5mg / kg. Take out the plow layer soil (0-20cm) of each plot (about 1t), put it into a container and spray CdSO 4 The solution was fully mixed and then backfilled into the cell, and the test was started after 2 months of equilibration.

[0045] The passivating agent or combination of passivating agents used in this example is the same as in Example 1.

[0046] The test plant was tobacco, and the tobacco seedlings with good growth were selected for transplanting. Two ridges were planted in each plot, and 4 tobacco seedlings were transplanted in each ridge. Before planting, the fertilizer is applied in holes in the soil, the amount of nitrogen application is 4kg of pure nitrogen per mu, and phosphorus and potassium fertilizers are applied a...

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Abstract

The invention discloses a multi-functional composite conditioner for controlling cadmium-polluted soil and a remediation method for soil cadmium pollution. The multi-functional composite conditioner comprises an inorganic passivation agent for soil heavy metal cadmium, an organic passivation agent and a cadmium antagonist, wherein the inorganic passivation agent is selected from red mud, hydroxyapatite, bentonite, zeolite or dolomite; the organic passivation agent comprises cruciferous plant residues or liliaceous plant residues. The cruciferous plant residues are Chinese cabbage plant residues, rape plant residues, leaf mustard plant residues or cabbage plant residues, and the liliaceous plant residues are garlic plant residues, onion plant residues or Chinese chive plant residues. The cadmium antagonist is a compound containing Zn, Ca or Fe. The multi-functional composite conditioner adopts a composite cadmium remediation mode, can reduce the content of cadmium in plant bodies, and provides an effective, feasible and economic means for the planting of agricultural products with normal content of cadmium.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal treatment, in particular to a multifunctional composite conditioner for treating cadmium-contaminated soil and its application in soil cadmium-polluted restoration methods. Background technique [0002] In recent years, with the development of industry and urbanization, the risk of cadmium (Cd) pollution in farmland soil in my country has become increasingly prominent. Cd has been widely concerned because it can persist in the soil environment, accumulate and pass through the biological food chain, and cause harmful effects on human health. my country's Cd polluted farmland has exceeded 1.3×10 4 hm 2 , involving 25 regions in 11 provinces and cities. At present, the concentration of Cd in the edible parts of many vegetables grown on medium and low Cd-polluted farmlands, such as leafy spinach, has exceeded the national standard of 0.2mg kg -1 . In particular, incidents of cadmium exce...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 李菊梅陈世宝韦东普马义兵
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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