Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method

A heavy metal and vegetable field technology, applied in the field of soil heavy metal pollution control, can solve the problems of limited repair ability of natural clay minerals, difficulty in large-scale promotion and application, and practical impact, so as to reduce bioavailability and transferability, and apply Wide-ranging, low-cost effects

Active Publication Date: 2010-03-10
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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Problems solved by technology

The restoration ability of natural clay minerals is limited, and to achieve a better restoration effect, the amount of application is often large, resulting in high treatment costs, and the practicability is affected to a certain e...

Method used

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  • Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method
  • Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method
  • Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method

Examples

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Embodiment 1

[0018] Example 1: In-situ passivation to repair cadmium contaminated soil

[0019] The test soil was collected from Daye, Hubei, with a pH of 7.20 and a total Cd content of 1.20 mg / kg, which was slightly cadmium polluted soil. The experiment has two types of treatment: sepiolite single treatment (s) and sepiolite and calcium dihydrogen phosphate compound treatment (s+p). In the former, 3%, 6%, and 9% of sepiolite ore powder passed through a 200-mesh sieve are added to the soil by mass; the latter is added with the same amount of sepiolite and 0.25% calcium dihydrogen phosphate at the same time; No passivation material was added as a control treatment (CK). Mix the soil and passivation materials thoroughly, and apply a certain amount of urea and potassium dihydrogen phosphate as base fertilizer, and put them in plastic pots. Each pot contains 2.5 kg of soil, and each treatment is repeated 3 times. Sow rapeseed after one month of aging and irrigate with deionized water daily to k...

Embodiment 2

[0026] Example 2: In-situ passivation repair of cadmium-lead compound contaminated soil

[0027] In order to further investigate the remediation effect of the passivation remediation method of the present invention on the heavy metal composite contaminated soil, a simulated cadmium-lead composite contaminated soil was prepared, and a passivation remediation experiment was performed. The test soil was the same as in Example 1, and Pb-300mg / kg was added to the soil to make a cadmium-lead compound contaminated soil. The experimental treatment is the same as in Example 1. Mix the soil and passivation materials thoroughly, add a certain amount of urea and potassium dihydrogen phosphate as base fertilizer, mix them thoroughly, and put them into plastic pots, each pot containing 2.5 kg of soil, and each treatment is repeated 3 times. Sow rapeseed after one month of aging and irrigate with deionized water daily to keep the soil moisture at about 60% of the field water holding capacity. ...

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Abstract

The invention provides a method for restoring heavy metal pollution of vegetable field soil with an in-situ passivation method. The method comprises the step of applying sepiolite and monocalcium phosphate in the vegetable field soil to be restored according to the proportions of 3-9 percent and 0.25 percent of the dry soil according to the specific pollution condition and mixing evenly the sepiolite and monocalcium. The invention reasonably uses passivation materials of sepiolite and monocalcium, remarkably reduces the bioavailability and transferability of the soil heavy metal by reactions of absorption, complexation and precipitation, and the like between the sepiolite and monocalcium and the heavy metal element, simultaneously improves the self-cleaning capacity of the soil, improves the soil fertility condition so as to produce high-quality and high-yield vegetables and restore the ecological function and industrial function of the vegetable field soil. The invention has the advantages of wide material source, simple use method, low cost, favorable restoring effect, wide application range, no secondary pollution and favorable ecological benefits and economical benefits.

Description

Technical field [0001] The invention relates to a treatment technology for soil heavy metal pollution, in particular to a method for in-situ passivation and restoration of vegetable soil heavy metal pollution. Background technique [0002] my country is a major vegetable producer and consumer in the world, with a vegetable planting area of ​​more than 17 million hectares and a total output of more than 500 million tons, making it the world's third largest vegetable exporter. However, due to the high multiple cropping index, the large input of pesticides and fertilizers, and most of them are distributed in the suburbs, which are greatly affected by urban industrialization pollution, the heavy metal pollution of my country's vegetable fields is becoming more and more serious. Investigations have shown that Cd pollution in vegetable soils in my country is relatively serious, with a Cd content exceeding the standard rate of 24.1%. More than 10,000 hectares of vegetable plots in the ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 王林徐应明孙扬梁学峰秦旭
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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