A kind of biochar with stable immobilization of heavy metals

A technology of heavy metals and biochar, applied in the direction of biofuel, carbon preparation/purification, special form of dry distillation, etc., can solve the secondary pollution of soil and groundwater, the inability to degrade biomass, and limit the application of biochar, etc., to reduce Ecological effectiveness and potential risks, increased reliability and durability, and reduced dissolution rate effects

Active Publication Date: 2022-02-22
深圳金普迈生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resulting problem is: enriching a large amount of heavy metals in the polluted site in the plant body, although the environmental risk of the soil is reduced, but a large amount of polluted biomass is produced, which cannot be degraded. The possibility of secondary pollution caused by soil and groundwater
[0004] Studies have shown that the biochar prepared by phytoremediation of biomass has a good effect on the retention of heavy metals, and the pyrolysis product biochar has great application potential, but this kind of biochar has the danger of releasing heavy metals during the aging process, which seriously limits Applications of such biochar

Method used

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  • A kind of biochar with stable immobilization of heavy metals
  • A kind of biochar with stable immobilization of heavy metals
  • A kind of biochar with stable immobilization of heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Iris Siberia is planted in an incubator with Morad culture solution. After 5 days, the EDTA-2Na solution with a concentration of Na element of 90mg / L is added to the incubator. After 5 days, Cu is added in the incubator. The concentration of the element is copper sulfate solution of 390mg / L, the concentration of Pb element is the lead nitrate solution of 260mg / L, and the concentration of Ni element is the nickel sulfate heptahydrate (H 2 SO 4 ·H 2 O.Ni) solution to simulate polluted water, cultivated for 60 days, during which the pH of the aqueous solution in the incubator was kept within the range of 5.9 to 6.0. After the experiment, the roots, stems and leaves of Siberia were collected, and the temperature was 100 ° C. Dry in the environment, and then pulverize to a particle size of 1.6 μm to obtain biomass.

[0058] (2) Attapulgite, montmorillonite and biomass (by dry weight) with a weight ratio of 2.0:1.5:1 are carried out as follows:

[0059] The attapulgite...

Embodiment 2

[0065] Prepare biochar in a method similar to Example 1, the difference is:

[0066] The concentration of Cu element in copper sulfate solution is 380 mg / L, the concentration of Pb element in lead nitrate solution is 270 mg / L, and the concentration of Ni element in nickel sulfate heptahydrate is 450 mg / L.

[0067] After pyrolysis, the total enrichment amount of Cu in the biochar was 14.7mg / g, that of Pb was 87.2mg / g, and that of Ni was 36mg / g.

Embodiment 3

[0069] Prepare biochar in a method similar to Example 1, the difference is:

[0070] Low-temperature pyrolysis stage: the pyrolysis temperature is 320°C, and the pyrolysis time is 2.0h;

[0071] High-temperature pyrolysis stage: the pyrolysis temperature is 600°C, and the pyrolysis time is 1.5h.

[0072] After pyrolysis, the total enrichment amount of Cu in the biochar was 14.6mg / g, that of Pb was 87.3mg / g, and that of Ni was 36mg / g.

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Abstract

The invention discloses a biochar with stable solidification of heavy metals. The high enrichment property of aquatic plants is used to absorb heavy metals in polluted water, and the aquatic plants enriched with heavy metals and clay minerals are co-pyrolyzed to obtain biochar. The present invention uses in-situ adsorption to coat or enrich heavy metals in biochar, prolongs the migration time of heavy metals, and is very stable. At the same time, in the process of preparing biochar, the attapulgite and montmorillonite are loaded in the biochar as clay minerals, and the heavy metals contained in the biochar play a catalytic role, synergizing with the activated attapulgite, The reliability of biochar is improved, and the ecological availability and potential risks of heavy metals in biochar are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental preparation, and in particular relates to biochar with stable solidification of heavy metals. Background technique [0002] Soil is an important material basis for human survival and development. Its physical and chemical properties affect the growth of plants and human health. It is of great significance to ensure the health of the soil environment. In recent years, with the rapid development of urbanization and agriculture, soil pollution has become increasingly serious. Industrial activities such as mining and metallurgy have accelerated the migration of pollutants, causing pollution of soil, surface and groundwater resources. Different from soil organic pollution, heavy metal pollution cannot be degraded naturally. If it enters the human body along the food chain, it will affect the kidneys, liver, nervous system and brain of the human body, and even have the risk of teratogenicity, canc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10B57/04C10B57/02C10B57/14C10B57/16C01B32/05
CPCC10B53/02C10B57/04C10B57/02C10B57/14C10B57/16C01B32/05Y02E50/10
Inventor 张根王慧肖湘华
Owner 深圳金普迈生物科技有限公司
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