Method for maintaining in-situ chemical improvement effect for acidic multi-metal contaminated soil

A technology of polluted soil and soil improver, applied in the field of calcium magnesium phosphate fertilizer to maintain soil improvement effect, to achieve the effect of promoting plant growth, wide sources, simple and easy method

Inactive Publication Date: 2016-08-31
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is currently no amendment for heavy metal-contaminated soils for large-scale production and application.

Method used

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  • Method for maintaining in-situ chemical improvement effect for acidic multi-metal contaminated soil
  • Method for maintaining in-situ chemical improvement effect for acidic multi-metal contaminated soil
  • Method for maintaining in-situ chemical improvement effect for acidic multi-metal contaminated soil

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Experimental program
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Effect test

Embodiment 1

[0031] The experiment of this example was carried out in the network room of the Department of Environmental Science and Engineering, South China Agricultural University. The potting soil was taken from the 0-20cm farmland soil of Shangba Village, Xinjiang Town, Wengyuan County, Shaoguan City, Guangdong Province, in which heavy metals Pb, Cd, Cu and Zn It exceeds the national soil environmental quality standard (GB15618-1995). Put 2.8kg of soil in each pot, apply 36.4g of mixed improver, that is, the application rate is 13g / kg of soil, converted into field dosage (take soil bulk density of 1.30g / cm3, surface height of 0.15m): 1.30*0.15*667*13= 1690kg / mu. The improving agent is composed of limestone, zeolite, phosphate rock powder and mushroom slag, and the mass ratio of limestone, zeolite, phosphate rock powder and mushroom slag is 2:4:3:4. After the amendment is fully mixed with the soil, add deionized water to 60% of the field water holding capacity, fully balance at room t...

Embodiment 2

[0040] The test of this embodiment was carried out in the downstream area of ​​the polluted waters of the Dabaoshan mining area in Shangba Village, Xinjiang Town, Wengyuan County, Shaoguan City, Guangdong Province, where the heavy metals Pb, Cd, Cu and Zn exceeded the national soil environmental quality standard (GB15618-1995). The experimental field was divided into 6 blocks, and each block was divided into 3 fields of 1m×2m, a total of 18 small fields, and the row spacing between the fields was 30cm. After the land is turned over, the gullies between the fields are dug and stacked to form 15cm thick fields. Amendment was applied on May 20, 2014 for soil improvement. Wherein the improver is provided with 3 treatments: zeolite+limestone+phosphate rock powder (handling A) (the application amount of each field is 3.51kg, i.e. application rate 1170kg / mu, wherein the mass ratio of limestone, zeolite and phosphate rock powder 2:4:3), zeolite+limestone+phosphate rock powder+mushroo...

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Abstract

The invention belongs to the technical field of improvement and restoration of heavy metal contaminated soil and discloses a method for in-situ restoring acidic multi-metal contaminated farmland soil by the utilization of a soil improvement agent and for maintaining soil improvement effect by the utilization of a calcium magnesium phosphate fertilizer during the restoring period. The method of the invention comprises the following specific steps: (1) crushing raw materials in the mixed improvement agent, sieving to prepare agricultural-grade powder, separately storing, uniformly mixing before application, and uniformly mixing the uniformly-mixed improvement agent and surface soil of 15 cm deep; and (2) applying the calcium magnesium phosphate fertilizer after the soil improvement agent has been applied for 300-540 d, and uniformly and fully mixing with the surface soil of 15 cm deep. According to the invention, action effects of the improvement agent are maintained by later application of the calcium magnesium phosphate fertilizer. In addition, sources of raw materials are wide, cost is low, and the method is simple and feasible and is suitable for large-area of farmland soil slightly and moderately contaminated with cadmium, lead, copper and zinc.

Description

technical field [0001] The invention belongs to the technical field of improvement and restoration of heavy metal-contaminated soil, and particularly relates to a method for in-situ restoration of acidic polymetallic-contaminated farmland soil by using a soil amendment and maintaining the improvement effect of the soil by using calcium, magnesium, and phosphate fertilizers during the restoration. Background technique [0002] With the acceleration of urbanization, industrialization and agricultural intensification in our country, soil heavy metal pollution has become one of the important environmental problems restricting the sustainable development of agriculture in our country. According to the 2014 China Environmental Status Bulletin, 19.4% of my country's cultivated land soil points exceeded the standard, of which the proportions of slight, light, moderate and severe pollution were 13.7%, 2.8%, 1.8%, 1.1%, cadmium, Arsenic, mercury, lead, chromium, etc. are the main pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 龙新宪邹富桢蔡轩吴启堂
Owner SOUTH CHINA AGRI UNIV
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