Farmland heavy metal contaminated soil compound modifying agent and preparation method and application method thereof

A technology of polluted soil and improver, applied in the field of soil remediation, can solve problems affecting sustainable utilization, etc., and achieve the effect of ensuring sustainable production capacity, low cost, and reducing bioavailability

Active Publication Date: 2015-11-18
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a compound soil improver for farmland heavy metal polluted soil, which can not only effectively repair the heavy metal polluted soil, but a

Method used

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  • Farmland heavy metal contaminated soil compound modifying agent and preparation method and application method thereof
  • Farmland heavy metal contaminated soil compound modifying agent and preparation method and application method thereof
  • Farmland heavy metal contaminated soil compound modifying agent and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A compound improver for farmland heavy metal polluted soil, the compound soil improver is composed of the following raw materials in weight percentage: 20% activated weathered coal, 20% biochar, 20% sepiolite, 20% calcium magnesium phosphate fertilizer, diphosphate Ammonium 20%.

[0047] The activated weathered coal is prepared as follows: pulverize the weathered coal, pass through a 100-mesh sieve, mix the weathered coal with ammonium bicarbonate in a mass ratio of 1:1, and place it at 60°C for a 2-day activation. Add distilled water to the weathered coal activated by ammonium bicarbonate once again according to the mass ratio of water: weathered coal and ammonium bicarbonate is 8:1, after stirring evenly, carry out secondary activation in ultrasonic with power of 200W for 20 minutes, blast Dry to obtain activated weathered coal.

[0048] The preparation steps are as follows:

[0049] (1) Mechanically pulverize raw sepiolite to 100 mesh powder, dry at constant temper...

Embodiment 2

[0054] A kind of farmland heavy metal polluted soil composite improver, with embodiment 1, difference is:

[0055] The soil compound improver is composed of the following raw materials in weight percentage: 30% of activated weathered coal, 15% of biochar, 15% of sepiolite, 20% of calcium magnesium phosphate fertilizer and 20% of diammonium phosphate.

[0056] The method for purifying heavy metal-contaminated soil between mild and moderate levels using the above-mentioned heavy metal modifier comprises the following steps: first, remove impurities on the soil surface, keep the soil surface flat, spread the above-mentioned heavy metal modifier evenly on the surface of the polluted soil, and improve the heavy metal The amount of additive added is 120kg per mu. After spreading the heavy metal modifier, the soil is deeply plowed with a thickness of 26cm, and then rotated twice with a depth of 18cm to ensure that the modifier and the soil are evenly mixed. Then the farmland is left ...

Embodiment 3

[0058] A kind of farmland heavy metal polluted soil composite improver, with embodiment 1, difference is:

[0059] The soil compound improver is composed of the following raw materials in weight percentage: 35% of weathered coal, 15% of biochar, 10% of sepiolite, 20% of calcium magnesium phosphate fertilizer, and 20% of diammonium phosphate is 20%.

[0060] The method for purifying moderate heavy metal-contaminated soil by using the above-mentioned heavy metal modifier comprises the following steps: first remove the soil surface impurities, keep the soil surface smooth, spread the above-mentioned heavy metal modifier evenly to the surface of the polluted soil, and the addition amount of the heavy metal modifier is 160kg per mu. After sowing the heavy metal modifier, use a rotary tiller to rotate the surface soil once. The depth of the rotary tillage is 18cm. Rotate the soil once more to ensure that the amendment and the soil are evenly mixed. After that, the farmland with th...

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Abstract

The invention relates to a farmland heavy metal contaminated soil compound modifying agent and a preparation method and an application method thereof. The farmland heavy metal contaminated soil compound modifying agent comprises, by weight, 20-40% of activated decomposed coal, 15-25% of charcoal, 10-25% of sepiolite, 10-20% of calcium magnesium phosphate fertilizer and 10-20% of diammonium phosphate, wherein the activated decomposed coal is obtained by activating ammonium bicarbonate and ultrasonic waves, and the sepiolite is obtained by pyrolysis at the temperature of 600-800 DEG C. The farmland heavy metal contaminated soil compound modifying agent is low in cost and simple in formula and mainly used for passivating heavy metal of Cd, Cu, Pb and Zn in soil, the soil polluted by the heavy metal can be effectively repaired, the sustainable production capacity of the soil can be ensured, and the sustainable soil utilization is achieved.

Description

technical field [0001] The invention relates to a compound improver for farmland heavy metal polluted soil, a preparation method and an application method thereof, and belongs to the technical field of soil remediation. Background technique [0002] In recent years, my country's heavy metal pollution has shown an intensified trend, and soil heavy metal pollution poses a serious threat to the ecological environment, food safety and human health. There are about 10 million hectares of arable land polluted by heavy metals in the country, accounting for more than 10% of the total arable land. Every year, as many as 12 million tons of grain are polluted by heavy metals, and the reduction in grain production due to heavy metal pollution is as high as 10 million tons, resulting in total economic losses. At least 20 billion yuan. In addition, due to the complexity of soil heavy metal pollution, long-term accumulation, concealment of occurrence, slow effect of toxicity, specificity ...

Claims

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Application Information

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IPC IPC(8): C05G3/04A01C21/00C05G3/80
Inventor 薄录吉李彦井永苹张英鹏孙明仲子文
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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