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Cadmium (Cd) passivator for acid soil and application thereof

A technology of acidic soil and passivation agent, which is applied in application, soil conditioning materials, restoration of polluted soil, etc. It can solve the problems of reducing soil arableness, unstable passivation effect, and imbalance of elements such as calcium and magnesium, and achieves Solve the problem of resource utilization, ensure the effect of cadmium repair, and promote the effect of plant growth

Active Publication Date: 2017-12-08
JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Some scholars have found that a single passivation material is selective to heavy metals, and there are problems such as unstable passivation effect and damage to soil quality.
For example, long-term application of lime will lead to soil compaction, causing an imbalance of elements such as calcium and magnesium, and reducing soil arableness.

Method used

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  • Cadmium (Cd) passivator for acid soil and application thereof
  • Cadmium (Cd) passivator for acid soil and application thereof
  • Cadmium (Cd) passivator for acid soil and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Cadmium Passivator in Acidic Soil

[0034] For overcoming the deficiencies in the prior art, the invention provides a kind of acidic soil cadmium passivator for repairing acidic soil cadmium pollution, its composition comprises rice husk charcoal, lime, hydroxyapatite, hematite, rice husk charcoal and The weight ratio of lime, hydroxyapatite, and hematite is 35:35:20:10. In addition, on the basis of the above four components, two components of active silica fume and humus can be added. After ingredients, the weight ratio of rice husk charcoal to lime, hydroxyapatite, hematite, active silica powder and humus is 25~35:25~35:18~22:6~10:5~9:4 ~6.

[0035] Among them, active silicon powder is prepared as follows: calcium hydroxide aqueous solution and silicon dioxide are mixed according to the ratio of calcium to silicon molar ratio of 1:1, and the supernatant is filtered and removed after hydrothermal reaction for 24 hours, and the obtained precipitate is at...

Embodiment 2

[0041] Acid soil cadmium remediation test

[0042] This embodiment uses the heavy metal polluted farmland soil in Shuiquan Village around the Guixi Smeltery in Guixi City, Jiangxi Province as the test cadmium-contaminated acidic soil sample, soil pH=5.16, CEC=9.29cmol / kg, organic matter=21.7g / kg, available phosphorus = 53.1mg / kg, alkaline hydrolysis nitrogen = 115mg / kg, total cadmium = 1.17mg / kg, total copper = 124mg / kg, total lead = 80.5mg / kg; the cadmium content in the soil is 1 to 3 times the soil in my country Environmental quality standards (GB 15618-1995) between the second level (inclusive) is mildly polluted; soil cadmium content between 3 times and 5 times (inclusive) is moderately polluted.

[0043] Test procedure: Take 1 kg of cadmium-contaminated acidic soil sample that has passed through a 10-mesh sieve in a plastic beaker, then add acidic soil cadmium passivator, stir well, add deionized water according to 70% of the maximum water holding capacity of the soil field...

Embodiment 3

[0053] Indoor pot experiment

[0054] This embodiment uses the paddy soil polluted by industrial waste water in Xiangtian Bay, Rongheqiao Community, Beishan Town, Changsha County, Changsha City, Hunan Province as the test cadmium-contaminated acidic soil sample, soil pH=5.2, CEC=13.9cmol / kg, organic matter=24.8g / kg kg, available phosphorus = 28.9mg / kg, alkaline nitrogen = 140mg / kg, total copper = 52.4mg / kg, total cadmium = 0.92mg / kg, total lead = 61.4mg / kg.

[0055] Experimental procedure: mix 2g of passivator with 500g of cadmium-contaminated acidic soil sample evenly, that is, the passivator accounts for 0.4% of the weight of the soil. Add deionized water according to 70% of the maximum water holding capacity of the soil field, and sow 20 grains of ryegrass after 5 days of equilibrium. There are 5 treatments in the experiment, and each treatment is repeated 3 times. Thin out the seedlings one week after the ryegrass seedlings emerge, and keep 10 ryegrass seedlings in each p...

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Abstract

The invention discloses a cadmium (Cd) passivator for acid soil. The Cd passivator is prepared from the following components of rice hull charcoal, lime, hydroxyapatite and hematite. The Cd passivator for the acid soil, which is provided by the invention, can be used for improving the pH (potential of Hydrogen) of soil and decreasing the content of CaCl2 and ethylic acid extraction state Cd, and is used for promoting the conversion of Cd in the soil from a bioavailable state (an ion exchange state) to a potential available state (a carbonate binding state and a ferromanganese oxide binding state) and an unavailable state (a residue state), reaching the purpose of passivating the activity of the Cd, effectively restoring Cd polluted acid soil, promoting the growth of a plant and decreasing the absorption to the Cd of a crop.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal polluted soil, in particular to a cadmium passivator for acidic soil and its application. Background technique [0002] Heavy metals cannot be degraded by microorganisms in nature, so they will persist after entering the soil environment. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", which showed that the proportion of pollution points below the severe level exceeded the standard by 15%, and cadmium became the primary pollutant in my country's cultivated soil, and the rate of point points exceeding the standard was 7%. . Large-scale soil pollution not only threatens the red line of 1.8 billion mu of arable land, but also affects human health and social stability. [0003] The chemical stabilization method is to reduce the effective activity of heavy metals in the soil and reduce the absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00C09K109/00
CPCB09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 梁家妮崔红标周典海
Owner JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
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