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Composite biochar for preventing and treating heavy metal pollution and preparation method thereof

A biochar and heavy metal technology, applied in the restoration of polluted soil, biofuel, solid waste removal, etc., can solve the problems of soil and groundwater secondary pollution, biomass can not be degraded, etc., to promote effective absorption or rich set of effects

Active Publication Date: 2021-07-09
维塔探索(广东)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Enriching a large amount of heavy metals in polluted sites in plants reduces the environmental risk of the soil, but produces a large amount of contaminated biomass, which cannot be degraded. Therefore, it may cause secondary pollution to soil and groundwater. Pollution

Method used

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  • Composite biochar for preventing and treating heavy metal pollution and preparation method thereof
  • Composite biochar for preventing and treating heavy metal pollution and preparation method thereof
  • Composite biochar for preventing and treating heavy metal pollution and preparation method thereof

Examples

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preparation example Construction

[0044] Another aspect of the present invention aims to provide a method for preparing composite biochar for prevention and treatment of heavy metal pollution, said method comprising:

[0045] Step 1, planting plants in soil containing heavy metals to obtain biomass enriched in heavy metals.

[0046] In step 1, the plants include seed plants, bryophytes and ferns, preferably ferns, such as centipede grass, spinosa, and fern, more preferably centipede grass.

[0047] According to the invention, the fern has a large number of spores and a short period, and has unique ecological characteristics such as strong environmental adaptability and barren resistance. Centipede grass among ferns has the characteristics of one-time planting and multiple harvesting. It is a super-accumulator plant discovered in recent years, and it has an excellent enrichment effect on heavy metals As and Pb.

[0048] According to the present invention, the heavy metals include As and Pb. Since the absorptio...

Embodiment 1

[0110] (1) Deeply plow 20cm of organic matter (chicken manure, polyacrylamide with a molecular weight of 10 million and diethylenetriaminepentaacetic acid in a weight ratio of 10:1:0.8) accounting for 26% of the dry weight of the soil into the non-polluted soil After 20 days, plant centipede grass in the soil, and plow the soil every 5 days. After 7 days, dissolve arsenic trichloride and lead nitrate in water, and plow 15cm deep into the soil to simulate the soil rich in heavy metals As and Pb. Soil, the As element concentration in the simulated soil is 800mg / kg, and the Pb element concentration is 1800mg / kg.

[0111] After 26 days, the centipede grass was collected, dried at a temperature of 55° C. for 3 hours, and crushed to a particle size of 12 μm to obtain biomass.

[0112] (2) Shake sepiolite with a particle size of 24mm in concentrated sulfuric acid with a concentration of 1.0mol / L for 24h, pour out the supernatant, wash with water three times, dry at 90°C, and then dry...

Embodiment 2

[0127] Composite biochar was prepared in a manner similar to that of Example 1, except that the complex bacteria of Arthrobacter and Halomonas were not added.

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Abstract

The invention discloses composite biochar for preventing and treating heavy metal pollution and a preparation method thereof. Specifically, pteris vittata is utilized to enrich heavy metals arsenic and lead in soil, then the pteris vittata, hydroxyapatite, sepiolite and chitosan are sintered, and the mixture is compounded with microorganisms to prepare the composite biochar. According to the method disclosed by the invention, the heavy metals arsenic and lead are stably enriched or coated in the composite biochar, so that the potential danger of the heavy metals arsenic and lead to the environment is remarkably reduced, and a new development thought is also provided for treating heavy metal biomass.

Description

technical field [0001] The invention belongs to the technical field of environmental preparation, and in particular relates to a composite biochar for preventing and controlling heavy metal pollution. Background technique [0002] The key factor leading to soil heavy metal pollution is still human activities, such as heavy metal wastewater produced in the production process of metal smelting industry and mining industry. If it is not harmlessly treated and discharged directly into nature, it will cause heavy metal pollution in water and soil; secondly, there are also heavy metal elements such as lead and arsenic in automobile exhaust, although the most direct pollution is the atmosphere. However, once natural settlement, rainwater erosion, etc., will lead to the deposition of such metal pollutants in the soil; moreover, some organic fertilizers are made of urban garbage, river silt, etc., and the raw materials themselves contain a large amount of heavy metal elements. After...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09C1/10
CPCB09B3/00B09C1/105B09C2101/00Y02E50/10B09B3/40B09B3/60
Inventor 张根潘璐璐张奎
Owner 维塔探索(广东)科技有限公司
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