Soil conditioner for treating cadmium and arsenic combined pollution of farmland and application method of soil conditioner

A soil conditioner and compound pollution technology, which is applied in the field of farmland soil remediation, can solve the problems of secondary pollution, unknown soil-crop coupling treatment effect, and reduced effectiveness of heavy metals, and achieves simplified process, labor cost saving, and strong application scope. Effect

Pending Publication Date: 2021-06-11
湖南中米环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the steel slag in the soil conditioner belongs to industrial waste and is a powder agent, which may cause secondary pollution if it is directly applied to the farmland; at the same time, the invention only clarifies the effect of the soil conditioner on reducing the effectiveness of heavy metals, and the effect on soil-crops The effect of coupling governance is unknown

Method used

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  • Soil conditioner for treating cadmium and arsenic combined pollution of farmland and application method of soil conditioner
  • Soil conditioner for treating cadmium and arsenic combined pollution of farmland and application method of soil conditioner
  • Soil conditioner for treating cadmium and arsenic combined pollution of farmland and application method of soil conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A kind of preparation method of the soil conditioner that is used to control farmland cadmium, arsenic compound pollution

[0031] (1) Preparation of modified biochar: take dry rice straw from non-heavy metal-contaminated areas, crush it, and then pyrolyze and carbonize it at 500°C for 3 hours in a closed nitrogen atmosphere to obtain biochar. Stir and mix with 0.15mol / L nitric acid, remove ash and acid modification at room temperature, the stirring time is 2h, the stirring speed is 200r / min, after the stirring is completed, filter the leaching solution, and the obtained solid is washed with deionized water for several times until The pH of the eluate is 6.5-7.5, then dried at 90°C to constant weight, taken out after cooling, ground and sieved to obtain powdery modified biochar with a particle size range of 100-200 mesh.

[0032] (2) Get 50 mass parts of the modified biochar of step (1) gained, after mixing with 15 mass parts of reduced iron powder, 15 mas...

Embodiment 2

[0034] Six flat fields with an area of ​​about 0.9 mu were selected in a township in Datian County, Fujian Province for the verification test of soil conditioners. The test is set with 3 treatments, each treatment is repeated 3 times, and there are 9 plots in total. A 2.5-meter-wide protection row is set around the test area, and field ridges (20 cm in width and 30 cm in height) are set between every two plots, and the fields are covered. Plastic film to prevent water and fertilizer from different plots, and each plot is randomly arranged in blocks.

[0035] Treatment 1: blank (CK), conventional fertilization, without any soil conditioner;

[0036] Process 2: the soil conditioner 400kg / mu that conventional fertilization+embodiment one makes;

[0037] Treatment 3: conventional fertilization+800 kg / mu of the soil conditioner prepared in Example 1.

[0038] On June 30, 2020, the soil conditioner and water were mixed uniformly through a mixing tank at a mass ratio of 1:10 to form ...

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Abstract

The invention relates to the field of farmland soil remediation, in particular to a soil conditioner for treating farmland cadmium and arsenic combined pollution and an application method of the soil conditioner. The soil conditioner is prepared from the following components in percentage by mass: 50%-60% of modified charcoal, 10%-30% of reduced iron powder, 10%-30% of calcium magnesium phosphate fertilizer and 10%-30% of sepiolite. When the soil conditioner is applied, the soil conditioner is uniformly mixed with water through a stirring box to form slurry, then the slurry is sprayed into a rice field through slurry spraying equipment, and then the soil conditioner is fully mixed with soil through ploughing. The soil conditioner provided by the invention can effectively reduce the bioavailability of cadmium and arsenic in farmland soil, reduce the content of cadmium and arsenic in agricultural products produced in a cadmium and arsenic combined pollution farmland, and avoid secondary pollution in the use process.

Description

technical field [0001] The invention relates to the field of farmland soil restoration, in particular to a soil conditioner for treating farmland cadmium and arsenic compound pollution and an application method thereof. Background technique [0002] With the development of industry and agriculture, it satisfies people's food and clothing and brings great convenience, but also brings many soil pollution problems. According to the results of the second national soil survey in 2014, the excessive rate of heavy metals in cultivated land soil in my country is 19.4%, among which cadmium (Cd) and arsenic (As) are the two main pollutants. Heavy metals usually exist in the form of compound pollution, among which the compound pollution of cadmium and arsenic is especially common. In the specific farmland environment, relevant domestic scientific research institutes and enterprises have developed some products and technologies, but the difference between the two heavy metal elements, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/80C09K17/40A01C21/00C09K101/00
CPCC05B13/02C05G3/80C09K17/40A01C21/005C09K2101/00
Inventor 袁海伟王诗龙胡露
Owner 湖南中米环保科技有限公司
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