Passivating material for repairing cadmium and copper polluted soil and repair method combining agronomic measures

A technology for polluted soil and cadmium copper, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve problems such as joint restoration technology that has not been reported, and achieve long-term stability restoration and nutritional improvement. , the effect of supplementing soil nutrients and increasing the negative charge on the soil surface

Active Publication Date: 2019-08-23
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, few studies have dealt with the impact of agronomic regulation measures on soil remediation, and the combined remediation technology of the new model of "chemical passivation + phytoremediation + agronomic regulation" has not been reported.

Method used

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  • Passivating material for repairing cadmium and copper polluted soil and repair method combining agronomic measures
  • Passivating material for repairing cadmium and copper polluted soil and repair method combining agronomic measures
  • Passivating material for repairing cadmium and copper polluted soil and repair method combining agronomic measures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 passivation material cultivation experiment

[0025]Contaminated soil was collected in typical cadmium and copper soil contaminated farmland soil. The farmland soil without passivation materials was used as the control (CK), and the passivation materials applied included biomass power plant ash (D), apatite (L), lime (S), cow dung (O), biomass power plant ash : Apatite: lime = 6:1:1 mass ratio composite material (DLS), biomass power plant ash: apatite: lime: cow dung = 6:2:1:1 mass ratio composite material (DLSO) , a total of 7 treatments, each with 3 repetitions. Pass the air-dried farmland soil through a 10-mesh sieve, add 2 g of passivation materials per 1 kg of soil, that is, each passivation material accounts for 0.2% of the soil mass, and mix evenly. Constant temperature and humidity (temperature 25°C, humidity 40%) cultivation for 77 consecutive days, soil pH and available Cu and Cd contents were measured on the 7th, 14th, 28th, 42nd and 77th day r...

Embodiment 2

[0036] The preparation of embodiment 2 passivation material

[0037] 1. Passivation material: Without adding any binder, it is prepared from biomass power plant ash, lime, apatite and organic fertilizer. The mass percentage of each material is: biomass power plant ash 60%, lime 20%, Apatite 10% and organic fertilizer 10%, pH 10-13, particle size ≤ 3mm.

[0038] 2. The preparation of restoration materials includes the following steps:

[0039] (1) Dry raw materials: dry each component raw material until its moisture content does not exceed 1wt.%, to maintain the inherent activity of each component raw material;

[0040] (2) Sieving: all materials are passed through a 60-mesh sieve so that the materials are evenly mixed;

[0041] (3) Ingredients: Weigh out each material according to the mass ratio, place in a mixer, stir for 2 to 3 minutes to mix evenly;

[0042] (4) Granulation: Utilize a centrifugal granulator and a rounding machine, control the temperature at 50-60°C, the ...

Embodiment 3

[0044] Embodiment 3 soil moisture control experiment

[0045] Mix 0.8g of passivation material with a particle size of ≤3mm and 200g of polluted farmland soil evenly, and control the soil moisture. Soil humidity was set at 5 treatment levels: soil moisture accounted for 20%, 40%, 60%, 80% and 100% of the maximum field water capacity, and cultured at constant temperature and humidity for 7 days. Then determine the soil pH, available Cu and Cd content, see Table 4.

[0046] The results showed that the passivation materials significantly increased soil pH and effectively passivated soil heavy metals Cd and Cu. Soil pH of 40%, 60% and 80% treatment was significantly higher than that of 20% and 100% treatment; soil moisture of 40%, 60% and 80% treatment significantly reduced the content of available Cd and Cu, the reduction rate They were significantly greater than those of 20% and 100% treatments; the soil pH and available Cu and Cd contents of 40%, 60% and 80% treatments had no...

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Abstract

The invention relates to a passivating material for repairing cadmium and copper polluted soil and a repairing method combining agronomic measures. The passivating material has a pH value of 10-13 anda particle diameter of 1-3 mm, and is prepared from, by mass, 60% of biomass power plant ash, 20% of lime, 10% of apatite and 10% of an organic fertilizer. The combined agronomic measures include application dosage of the passivating material, plant planting time, density, planting method and soil moisture control. The passivating material and the repair method combining the agronomic measures can effectively promote the transformation of soil heavy metals Cd and Cu from an available state to a potential available state or an unavailable state, promotes plant growth and biomass accumulation while stabilizing / solidifying the heavy metals Cd and Cu, and improves land productivity and economic benefits. The material source is wide, the price is low, the combined repair method is simple and feasible, and the repair is efficient and stable, so that the passivating material has high economic benefit, ecological benefit, repair application and popularization value.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a passivation material for remediation of cadmium-copper-contaminated soil and a remediation method combined with agronomic measures. Background technique [0002] In most areas south of the Yangtze River in China, affected by climate and environmental changes, such as temperature, acid rain and heavy rainfall, the soil is acidic (pH is mostly below 5.6), which is mainly manifested in the highly unsaturated soil base and the oxidation of iron and aluminum. In addition, there are problems such as lack of organic matter, insufficient supply of nitrogen, phosphorus, and potassium, and low content of available calcium and magnesium, which limit soil productivity. In addition, in Guixi City, Jiangxi Province, the production of copper smelters caused heavy metal pollution in the surrounding and downstream areas. The pollutants are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C05G3/04B09C1/08A01B79/02C09K101/00C09K109/00C05G3/80
CPCC09K17/40C05B7/00B09C1/08A01B79/02C09K2101/00C09K2109/00C05G3/80
Inventor 周静梁家妮张娜祝振球华进城
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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