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Heavy metal-polluted acid soil modifying agent and application thereof

A technology of acidic soil and improver, which is applied in the field of restoration and improvement of acidic soil, which can solve the problems of surface soil acidification and aggravation, and achieve the effects of controlling pollution, improving crop quality, and reducing plant effectiveness

Inactive Publication Date: 2016-03-23
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically speaking, phosphogypsum should be well applied to the remediation of heavy metal-contaminated soil and provide nutrients such as sulfur and phosphorus. Studies have shown that phosphogypsum has a certain adsorption capacity for heavy metals such as cadmium and zinc in wastewater, and can be easily absorbed. It can effectively remove heavy metals in wastewater, and the phosphate contained in phosphogypsum can solidify most heavy metals very well, but because phosphogypsum is often acidic or weakly acidic, its application may cause further acidification of the surface soil exacerbated, thus limiting its application

Method used

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  • Heavy metal-polluted acid soil modifying agent and application thereof
  • Heavy metal-polluted acid soil modifying agent and application thereof
  • Heavy metal-polluted acid soil modifying agent and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A multifunctional modifier for acidic soil seriously polluted by heavy metals, which consists of the following components in terms of mass fraction: 90% phosphogypsum and 10% steel slag. The preparation method is: uniformly mixing phosphogypsum and steel slag, A powdery solid passing through a 100-mesh standard sieve. Apply 50 grams of this compound soil conditioner per 1 kilogram of soil. The pH of the soil before application of amendments was 5.0, and the contents of Cr, Cu, Cd, and Pb were 674mg / kg, 1721mg / kg, 83mg / kg, and 828mg / kg, respectively, which exceeded the "Soil Environmental Quality Standard Value" (GB15618-1995) The standard of the third-grade soil belongs to the heavily polluted acidic soil. The relevant indexes after three days of application of the compound improver are shown in the table below. -2004), the determination of effective silicon, phosphorus and sulfur content is in accordance with the Ministry of Agriculture's "Soil Testing" (NY / T1121).

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Embodiment 2

[0021] A multifunctional modifier for acidic soil seriously polluted by heavy metals, which consists of the following components in terms of mass fraction: 80% phosphogypsum and 20% steel slag. The preparation method is: uniformly mixing phosphogypsum and steel slag, A powdery solid passing through a 100-mesh standard sieve. Apply 50g of this compound soil conditioner per 1kg of soil. The pH of the soil before application of amendments was 5.0, and the contents of Cr, Cu, Cd, and Pb were 674mg / kg, 1721mg / kg, 83mg / kg, and 828mg / kg, respectively, which exceeded the "Soil Environmental Quality Standard Value" (GB15618-1995) The standard of the third-grade soil belongs to the heavily polluted acidic soil. The relevant indexes after three days of application of the compound improver are shown in the table below. -2004), the determination of effective silicon, phosphorus and sulfur content is in accordance with the Ministry of Agriculture's "Soil Testing" (NY / T1121).

[0022]

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Embodiment 3

[0025]A multifunctional modifier for acidic soil seriously polluted by heavy metals, which consists of the following components in terms of mass fraction: 50% phosphogypsum and 50% steel slag. The preparation method is: uniformly mixing phosphogypsum and steel slag, A powdery solid passing through a 100-mesh standard sieve. Apply 50g of this compound soil conditioner per 1kg of soil. The pH of the improved soil before application of amendments was 5.8, and the contents of Cr, Cu, Cd, and Pb were 1095mg / kg, 768mg / kg, 72.4mg / kg, and 1044mg / kg respectively, which exceeded the "Soil Environmental Quality Standard Value" (GB15618-1995 The standard of the third-grade soil in ) belongs to the weakly acidic soil that is seriously polluted. The relevant indicators after three days of application of the compound improver are shown in the table below. HJ / T166-2004), the determination of available silicon, phosphorus and sulfur content is in accordance with the "Soil Testing" (NY / T1121) ...

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Abstract

The invention discloses a heavy metal-polluted acid soil modifying agent and application thereof. The modifying agent is prepared by evenly mixing fine ground steel slag with phosphorus gypsum powder according to the mass ratio of 1:1-1:10; application of the modifying agent comprises the steps that the modifying agent is evenly applied to soil according to the ratio that 20-50 g of the modifying agent is applied to every kilogram of the soil, and then the modifying agent and the soil are mixed evenly. According to the heavy metal-polluted acid soil modifying agent and the application thereof, the defects that an acid soil modifying agent on the market at present is single in effect, complex in composition, tedious in preparation and long in applying period are overcome, the two industrial wastes are effectively combined together, the weakness of one part is overcome by learning from the strong points of other parts, and waste materials are changed into things of value; the industrial wastes serve as the acid soil modifying agent, the soil acidity can be effectively improved, the plant availability of heavy metal in the acid soil is reduced, the effective elements such as phosphorus, sulfur and silicon which are needed by the crop growth are significantly improved, and the crop yield can be effectively increased and the crop quality can be effectively improved while pollution is controlled.

Description

technical field [0001] The invention belongs to the technical field of acidic soil pollution control and soil improvement, and specifically relates to a method for repairing and improving acidic soil seriously polluted by heavy metals. Phytoavailability of nutrients among them. Background technique [0002] As the contradiction between population and environmental resources becomes increasingly prominent, soil degradation has become a major global problem, and soil acidification, as an important aspect of soil degradation, seriously restricts the development of agriculture. my country's acidic soil is mainly distributed in the vast tropical and subtropical regions south of the Yangtze River, Yunnan, Guizhou and Sichuan, with a total area of ​​20.3 million hectares, accounting for about 21% of the country's cultivated land. The reason for soil acidification in southern my country is that, on the one hand, the high temperature and heavy rainfall lead to the leaching of base i...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/08C09K101/00C09K109/00
Inventor 吴代赦黄尧程钊熊卿朱衷榜
Owner NANCHANG UNIV
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