Passivating method for reducing bioavailability of cadmium of acidic cadmium polluted soil

A cadmium-contaminated soil and bioavailability technology, which is applied in the field of remediation of heavy metal-contaminated soil, can solve the problems of large impact on soil bioavailability, need to strengthen the passivation effect, and high cost of purchased lime, so as to prevent and control heavy metal pollution and ensure Effects of food security and low cost

Inactive Publication Date: 2011-05-11
湖南宇丰农科生态工程有限公司
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AI Technical Summary

Problems solved by technology

Lime passivation is mainly used for acidic Cd-contaminated soil at present. The main disadvantage is that the lime is too alkaline, which has a great impact on soil bioavailability and may cause secondary pollution. In addition, the cost of purchasing lime is relatively high, and the passivation effect needs to be strengthened.

Method used

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  • Passivating method for reducing bioavailability of cadmium of acidic cadmium polluted soil
  • Passivating method for reducing bioavailability of cadmium of acidic cadmium polluted soil
  • Passivating method for reducing bioavailability of cadmium of acidic cadmium polluted soil

Examples

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Effect test

Embodiment 1

[0023] Embodiment 1 (potted plant test):

[0024] In this embodiment, a pot test is used to study the passivation effect of the present invention on cadmium activity in two kinds of acidic soils (flush mud field and yellow mud field). Three treatments are set in the test: 1. CK, do not apply passivator; 2 ); ③ apply lime 4g / kg (equivalent to field consumption of 9000kg / hm 2 ), to compare the passivation effect of passivator of the present invention. Each treatment was repeated three times, randomly grouped and arranged, and a protection row was set. The test uses a 27cm×30cm white ceramic pot. The soil is air-dried and sieved before potting (the aperture is 0.3cm×0.3cm), and each pot is filled with 9.0kg of soil. At the same time, a certain amount of nitrogen, phosphorus, and potassium fertilizers are applied to each pot. , the passivator of the present invention is contained in one pot of fertilizer, and the mixed lime is contained in the fertilizer of one pot. The cultiv...

Embodiment 2

[0034] Embodiment 2 (field test of in situ passivation):

[0035] In this example, a field experiment (rice-rape rotation) was used to study the effect of the method of the present invention on the uptake and accumulation of Cd by brown rice in the current season and the aftereffect on Cd accumulation in rapeseed. The test site was carried out in Dishui Village, Yuetang District, Xiangtan City. The test soil was fluvo-aquic soil formed by river alluvial deposits. The chemical properties are shown in Table 4 below. 3 treatments were set in the test: 1. CK, without passivating agent; 2. 3000kg / hm of passivating agent of the present invention was applied 2 ; 3. use passivator 6000kg / hm of the present invention 2 . The passivating agent of the present invention is applied to the rice in the first season, and the rapeseed is not applied in the second season. The specific application method is to spread the passivating agent evenly on the soil surface before fertilizing the acidic...

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Abstract

The invention discloses a passivating method for reducing bioavailability of cadmium in acidic cadmium polluted soil. The passivant adopted by the method is industrial waste which is obtained by recycling pulp alkaline liquor with hydrated lime in the paper mill. The industrial waste generally contains 0.8g / kg-3.0g / kg of effective silicon, 0.6g / kg-2.0g / kg of effective iron and 100.0mg / kg-400.0mg / kg of effective phosphorus. The passivating method of the invention has the advantages of resource conservation, environmental friend, low cost, simple operation and the like, and can effectively control the soil heavy metal pollution and reduce the bioavailability of cadmium in acidic cadmium polluted soil.

Description

technical field [0001] The invention relates to a repair method for heavy metal polluted soil, in particular to a method for reducing the bioavailability of heavy metal cadmium in soil by chemical means. Background technique [0002] Heavy metal pollution in paddy soil is a serious problem facing my country's agricultural environment. In recent years, with the development of industrialization and agricultural intensification economy, the heavy metal pollution of farmland in my country has become more and more serious. The rice and its product quality supervision, inspection and testing center of the Ministry of Agriculture showed that the results of random inspections on the safety of rice in the national market in 2002 showed that lead was the most serious heavy metal exceeding the standard, with an exceeding rate of 28.4%, followed by cadmium (Cd), with an exceeding rate of 10.3% ( Peng Hua, Ji Xionghui, Zhang Yangzhu, Liu Zhaobing: "Research Progress on Agricultural Safe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 纪雄辉刘昭兵石丽红彭华
Owner 湖南宇丰农科生态工程有限公司
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