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Barrier layer based safe utilization method for cadmium-polluted farmlands

A barrier layer and agricultural land technology, which is applied in the field of heavy metal-contaminated agricultural land restoration and safe utilization, can solve the problems of heavy pollution, large area, and inapplicability of VIP integration technology, and achieve good effect, low background, and easy operation

Inactive Publication Date: 2017-08-18
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

However, VIP integration technology is not suitable for areas with low heavy metal background, low precipitation, and neutral or alkaline soil in the north
However, due to the impact of historical sewage irrigation in the north, a large number of heavy metal sewage irrigation areas with large areas and heavy pollution have been formed, and the problem of its safe use needs to be solved urgently

Method used

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  • Barrier layer based safe utilization method for cadmium-polluted farmlands
  • Barrier layer based safe utilization method for cadmium-polluted farmlands

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The agricultural land treated in this example is a sewage irrigation area around Shenyang City, Liaoning Province. The area of ​​the agricultural land is 15 mu, the type is dry land, the annual average precipitation is about 720mm, the average depth of groundwater is 0.9m, the average concentration of cadmium in surface soil is 1.0mg / kg, and the average concentration of cadmium in deep soil is 0.15mg / kg. for corn. The soil and corn were collected before and after treatment, and the changes of cadmium content in them were compared.

[0058] The total concentration of cadmium in the soil was determined by graphite furnace atomic absorption spectrophotometry (GB / T 17141-1997); the method for determining the effective concentration of cadmium in soil refers to the Tessier continuous extraction method, in which the effective concentration is an exchangeable state; the cadmium content in crops was determined Graphite furnace atomic absorption spectrometry (GB / T 5009.15-2003)...

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Abstract

The invention relates to the technical field of remediation and safe utilization of farmlands polluted by heavy metal, and in particular to a barrier layer based safe utilization method for cadmium-polluted farmlands. The method includes adding a passivator D1 to a surface layer A1, plowing the surface layer and constructing a barrier layer A2; exchanging the barrier layer A2 with a deep layer B1 through deep plowing, plowing the barrier layer A2 to a position where root systems of bulk farm-products seldom contact, and plowing the original deep layer B1 as a plowing layer B2; fertilizing the plowing layer B2 to recover productivity, and adding a passivator D2. According to the characteristics of low background value of heavy metal, low precipitation, neutral or weakly-alkaline soil and the like in north, barrier layer construction is taken as a core, deep plowing and fertilizing are applied for assistance, and accordingly, passivated deep burying of high-cadmium-concentration soil layers is realized; a combined technology applicable to safe utilization of the cadmium-polluted farmlands in north is created, and the barrier layer based safe utilization method has the advantages of good effect, easiness in operation, easiness in popularization and the like.

Description

technical field [0001] The invention relates to the technical field of restoration and safe utilization of agricultural land polluted by heavy metals, in particular to a method for safe utilization of cadmium-contaminated agricultural land based on a barrier layer. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the rate of excessive agricultural land in my country reached 19.4%, among which cadmium pollution is the most prominent. Therefore, the restoration and safe use of cadmium-contaminated agricultural land has become an urgent livelihood issue to be solved. The "Soil Pollution Prevention and Control Action Plan" promulgated by the State Council in 2016 also listed it as the focus of work in the next five to ten years. [0003] The previous studies all proceeded from the perspective of "risk source-exposure route-receptor",...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02
CPCA01B79/02
Inventor 吴波罗明郭书海
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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