A preparation method of modified biochar for improving heavy metal pollution

A heavy metal and biochar technology, applied in the preparation/purification of carbon, energy input, etc., can solve problems such as reducing soil environmental risks, and achieve the effect of promoting effective absorption or enrichment, reducing content, and reducing potential risks

Active Publication Date: 2022-06-03
深圳金普迈生物科技有限公司
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  • Application Information

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Problems solved by technology

[0004] In recent years, phytoremediation technology has been widely used to enrich a large amount of heavy metals in plants in polluted sites, effectively reducing the environmental risk of soil, but at the same time, it also produces a large amount of plant waste containing heavy metals.

Method used

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  • A preparation method of modified biochar for improving heavy metal pollution
  • A preparation method of modified biochar for improving heavy metal pollution
  • A preparation method of modified biochar for improving heavy metal pollution

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preparation example Construction

[0029] The present inventors also found that an appropriate amount of iron can improve the effectiveness of lead and promote the accumulation of lead in plants such as cattails.

Therefore, described chelating agent preferably contains the chelating agent of iron, for example iron ethylenediaminetetraacetate (Fe-EDTA), diethylene

Ferric triaminepentaacetate (Fe-DTPA), ethylenediamine ferric ortho-dihydroxyacetate (Fe-EDDHA), more preferably Fe-EDTA. Among them, Fe-

EDTA has stable chemical properties and is easily soluble in water. EDTA surrounds metal iron ions in space hexahedrons, and has excellent chelating properties.

combined effect.

According to the present invention, the concentration of described Fe-DTPA iron element is 30~200mg / L, preferably 50~100mg / L, more

Preferably it is 60-70 mg / L.

According to the present invention, in artificial wetland, inoculate microorganism, described microorganism is compound bacteria, promotes the growth of plant,

And increase...

Embodiment 1

The liquid was poured out, the zeolite was washed with deionized water for 3 times, dried at 100 °C for 3 hours, and then calcined at 500 °C for 1.5 hours.

A modified zeolite is obtained.

(3) biomass, modified zeolite, diatomite and sepiolite are carried out as follows by following weight portion:

[0081]

[0082]

The sepiolite that particle diameter is 3mm is added in the diatomite with moisture content of 55%, stirs 12h, adds to it again

Biomass, continue to stir for 16h, and finally add modified zeolite to the system, stir for 6h, and keep the system at 70°C

3h, grind into powder and pass through a 110-mesh sieve.

Above-mentioned powder is calcined according to the following procedure to obtain modified biochar:

The first stage: calcination temperature 280 ℃, holding time 2.5h, heating rate 4 ℃ / min;

Second stage: calcination temperature 460 ℃, holding time 1.5h, heating rate 6 ℃ / min;

[0087] The third stage: the calcination temperature is 570° C., the holding t...

Embodiment 2

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Abstract

The invention discloses a method for modifying biochar for improving heavy metal pollution. Cattails with good enrichment effects on heavy metal lead and zinc are used to enrich heavy metal lead and zinc in artificial wetlands, and a chelating agent is added in the growth process and complex bacteria to promote the absorption of heavy metals. After the cultivation, dry the biomass to obtain biomass, and further blend and calcinate the biomass with modified zeolite, diatomite and sepiolite to obtain modified biochar. Lead and zinc are stably enriched or coated in the modified biochar to improve the stability of heavy metals, reduce the dissolution rate of heavy metals, and effectively reduce the potential risks of heavy metals to the environment.

Description

A kind of preparation method of modified biochar for improving heavy metal pollution technical field The invention belongs to the technical field of environmental preparation, be specifically related to a kind of modified organism for improving heavy metal pollution carbon. Background technique The development and processing and utilization of mineral resources can also cause environmental pollution and ecological damage while providing mineral resources. serious consequences. Due to the long biological half-life of heavy metals, it is almost difficult to biodegrade, so heavy metal pollution in soil and water can Entering the organism through the geochemical cycle and food chain, the food safety and ecological safety of the residents of the mine and its surrounding areas are even more serious. It brings serious hidden dangers to social harmony. Therefore, the prevention and control of environmental heavy metal pollution is extremely important. Heavy metal wastewa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01B32/05Y02P20/133
Inventor 张根潘璐璐陈智轩
Owner 深圳金普迈生物科技有限公司
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