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Production process of heavy metal-mediated biochar composites using silicate solidification

A production process and heavy metal technology, applied in the field of heavy metal-mediated biochar production process, to achieve the effects of improving water retention, prolonging migration time, and improving stability

Active Publication Date: 2022-02-15
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, due to the continuous aging process of biochar or biomass obtained by such technologies, there is still the risk of releasing heavy metals

Method used

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  • Production process of heavy metal-mediated biochar composites using silicate solidification
  • Production process of heavy metal-mediated biochar composites using silicate solidification
  • Production process of heavy metal-mediated biochar composites using silicate solidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] (1) Put 1 / 2 Hoagland nutrient solution and trace element solution in the incubator, and plant water turtles in the incubator. After one week, add lead nitrate solution with a lead concentration of 260 mg / L in the incubator , the manganese chloride solution with a manganese element concentration of 580 mg / L and the zinc sulfate heptahydrate solution with a zinc element concentration of 420 mg / L simulated polluted water, cultivated for 30 days, and collected the roots, stems and leaves of water turtles after the experiment. It was dried at a temperature of 105 °C for 2 h and crushed to a particle size of 160 μm to obtain heavy metal-based biomass.

[0076] Wherein, the trace element liquid consists of: potassium iodide: 0.83mg / L, boric acid: 6.2mg / L, manganese sulfate: 22.3mg / L, zinc sulfate: 8.6mg / L, sodium molybdate: 0.25mg / L, sulfuric acid Copper: 0.025mg / L, cobalt chloride: 0.025mg / L.

[0077] (2) The heavy metal-based biomass, red mud and bentonite (by dry weight) w...

experiment example 1

[0087] Referring to "Microwave Digestion Method of Total Heavy Metals in Soil (HJ832-2017)", accurately weigh 0.400g of the biochar composite prepared in Example 1 into a polytetrafluoroethylene digestion tank, add 18mL of concentrated nitric acid and 6mL of concentrated HCl , let it stand for 12 hours to react, and then put it into a microwave digestion apparatus for digestion to obtain a digestion solution. After the digestion is completed, transfer the digestion solution to a 250mL volumetric flask, set the volume to the scale line, shake well and pass through a 0.45μm water filter membrane, and use ICP-OES to measure the content of heavy metals lead, manganese and zinc in the filtered solution. As far as the content of heavy metals in the biochar composite is concerned, the total enrichment amount of lead is 18 mg / g, the total amount of manganese enrichment is 112 mg / g, and the total amount of zinc enrichment is 38 mg / g.

experiment example 2

[0089] Referring to the environmental protection standard "Solid Waste Leaching and Toxicity Leaching Method (HJ 557-2009)", weigh 0.4g of the biochar compound of Example 1 into a 500m conical flask, add 200mL of deionized water, and seal the bottle with a parafilm Place the Erlenmeyer flask in a constant temperature shaking box and shake it for 8 hours at 25°C with a frequency of 110 times / min. Water-based filter membrane, the content of Pb, Mn and Zn elements in the filtrate was measured by ICP-OES, and the obtained results are shown in Table 1:

[0090] Table 1: Content and dissolution rate of heavy metals in biochar composites

[0091]

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Abstract

The invention discloses a production process of a heavy metal-mediated biochar composite solidified by silicate. Water turtles have an excellent enrichment effect on manganese ions in sewage. Using water turtles to treat heavy metals such as lead, manganese and zinc contained in sewage is adsorbed in roots, stems and leaves, and combined with activated red mud and bentonite in the Pyrolysis in stages at high temperature, and then blended with zeolite to prepare heavy metal-mediated biochar composites. The process of the invention significantly prolongs the migration time of heavy metals, improves the stability of heavy metals, and reduces the pollution risk of heavy metal leakage to the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental preparation, and in particular relates to a heavy metal-mediated biochar production process. Background technique [0002] Heavy metal pollution is mainly divided into two types: natural and man-made. Natural activities include volcanic activity and forest fires. The human factor is mainly industrial production, such as the acid wastewater produced by the mechanical processing industry contains a large amount of heavy metals, and the large amount of sewage discharged by the mining and metallurgical industries. Other human factors include vehicle exhaust emissions, abuse of pesticides and fertilizers, and random discarding of household garbage. These pollutants are leached by atmospheric precipitation, seriously polluting soil, surface water, and groundwater. [0003] After heavy metals enter the water body, they are difficult to degrade, pass through the food chain, and enter organisms, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/25B09B3/38B09B3/40B09B5/00
CPCB09B3/00B09B5/00
Inventor 张根潘璐璐杨波
Owner 深圳金普迈生物科技有限公司
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