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Soil passivation improver, and preparation method and application thereof

A technology of soil passivation and improver, which is applied in the direction of chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of difficult cultivation, heavy metal anti-dissolution repair time, large amount of curing agent, etc., to reduce absorption, Good passivation effect, effect of reducing bioavailability

Inactive Publication Date: 2017-07-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent "a heavy metal curing agent for polluted soil and its use method" (authorization number ZL201410107493.9) mixes bentonite, diatomite, sepiolite and phosphate rock powder in a certain proportion to obtain a combined curing agent, and uses the curing agent and The heavy metal polluted soil is fully mixed according to 1-3:100 (weight ratio) and a certain proportion of water is added for aging to achieve the effect of curing heavy metals such as cadmium, lead, copper, etc. The curing agent prepared by this method uses a large amount and can only Increase the phosphorus content in the soil
Chinese invention patent "a conditioner for heavy metal-contaminated soil" (application number 201610558435.7) fully mixed and fermented cow dung, poultry manure, pig manure and yeast powder, and then mixed with mechanically crushed limestone, humic acid and phosphoric acid Diammonium hydrogen, ammonium dihydrogen phosphate, calcium dihydrogen phosphate, dicalcium hydrogen phosphate, potassium dihydrogen phosphate, ethylenediaminetetraacetic acid, potassium permanganate, calcium oxide, magnesium oxide, and potassium chloride are fully mixed and stirred to obtain heavy metal Contaminated soil conditioner, the patented method requires a wide variety of raw materials and a complicated preparation process
At present, there are only passivators and improvers in the market. Although passivators have a good effect on passivating heavy metals, they are easy to cause soil compaction. Dissolution and long repair time, etc., it is not easy to cultivate crops after repair
The amendment can significantly increase the nitrogen, phosphorus, and potassium content of the soil, but the long-term effect of passivating heavy metals is not good.
Therefore, how to use natural materials to prepare economical and practical heavy metal polluted farmland passivation improvers with both heavy metal passivation and soil improvement has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~5

[0026] In embodiment 1~5:

[0027] According to "Atomic Absorption Method for the Determination of Effective State Lead and Cadmium in Soil Quality" (GB / T 23739-2009), the content of DTPA effective heavy metal in soil was determined;

[0028] According to "Determination of Ammonium Nitrogen, Available Phosphorus, and Available Potassium in Acidic Soil Combined with Extraction-Colorimetric Method" (NY / T1849-2010), the content of soil available Phosphorus and available Potassium was determined;

[0029] The content of soil organic matter was determined according to "Methods for Determination of Soil Organic Matter" (GB 9834-1988).

Embodiment 1

[0031] 1. Weigh 50% bentonite, 35% diatomaceous earth, 10% magnesium oxide, 4.9% iron oxide, 0.1% humic acid, spray 2% of the water into the material, and add it to a ball mill for full grinding 4 Hours, get the soil passivation improver.

[0032] 2. Add the compounded soil passivation improver at 1200kg / mu to the contaminated farmland containing Cd and Pb, fully plow and stir, and the equilibrium time is 20 days.

[0033] After 20 days, the samples were air-dried naturally. After testing, the effective concentration of Cd in the soil is 0.125mg / kg, and the effective concentration of Pb is 126mg / kg. After applying the passivation modifier, they are 0.085mg / kg and 71.6mg / kg respectively, which are lower than before the application. 32.0% and 43.2%; the organic matter content in the soil increased from 16.3% to 16.5%, the concentration of available phosphorus was 64.1mg / kg, and the concentration of available potassium was 170mg / kg. After applying the passivation modifier, they ...

Embodiment 2

[0035] 1. Weigh 70% bentonite, 20% diatomaceous earth, 5% magnesium oxide, 4.9% iron oxide, 0.1% humic acid, spray 3% of the water into the material, and add it to a ball mill for full grinding 3 Hours, get the soil passivation improver.

[0036] 2. Add the compounded soil passivation improver at 1000kg / mu to the farmland containing Cd or Pb pollution, fully plow and stir, and the equilibrium time is 30 days.

[0037]After 30 days, the samples were taken and air-dried naturally. After testing, the effective concentration of Cd was 0.126mg / kg, and the effective concentration of Pb was 126mg / kg. The former decreased by 40.0% and 45.8%, the organic matter content in the soil increased from 16.3% to 16.5%, the available phosphorus concentration was 64.1mg / kg and the available potassium concentration was 170mg / kg. kg and 181mg / kg, an increase of 5.5% and 6.5%, respectively.

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PUM

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Abstract

The invention discloses a soil passivation improver, and a preparation method and an application thereof. The soil passivation improver is prepared by the following steps: crushing bentonite, diatomite, magnesium oxide, ferric oxide and humic acid through a micro-wet ball mill process; spraying water which is 2-5% of the material; and fully grinding the mixture for 2-4 hours. According to the soil passivation improver, the activity of heavy metals in the soil is reduced and the concentration of effective heavy metals is reduced through natural mineral components such as bentonite and diatomite, and magnesium oxide; the air permeability of the soil is improved through the humic acid component, and nitrogen, sulfur, potassium and phosphorus and trace elements necessary to plants are supplemented while the heavy metals are complexed and the effective states of the heavy metals are reduced by means of functional groups, such as quinonyl, alcoholic hydroxyl group, carboxyl and carbonyl, in the humic acid; and meanwhile, fulvic acid rich in the soil is chelated with the heavy metals, so that the absorption amount of the plants on the heavy metals is reduced. The soil passivation improver has a wide application in heavy metal-polluted soil repair.

Description

technical field [0001] The invention belongs to the technical field of passivation improvement of heavy metal polluted soil, and more specifically relates to a soil passivation improver and its preparation method and application. Background technique [0002] On April 17, 2014, the "National Soil Pollution Survey Bulletin" reported that the national cultivated land soil site exceeded the standard rate of 19.4%, of which the proportions of slightly, lightly, moderately and heavily polluted sites were 13.7%, 2.8%, and 1.8% respectively. % and 1.1%, the main pollutants are cadmium, lead, nickel, copper, arsenic, mercury and other heavy metals. These heavy metals have poor mobility in soil, long residence time, and cannot be degraded by microorganisms, causing serious deterioration of soil environmental quality. For heavy metal pollution in farmland, there are mainly three remediation technologies as follows: [0003] ① Use physical, chemical or biological methods to directly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 林亲铁姜洁如郑友平罗昊昱黄润林尹光彩
Owner GUANGDONG UNIV OF TECH
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