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An improved heavily polluted porous biochar and its preparation method

A technology of heavy pollution and biochar, applied in biofuels, chemical instruments and methods, and other chemical processes, can solve the problems of secondary pollution of soil and groundwater, heavy metals cannot be degraded by plants or biomass, and achieve mechanical properties Excellent, high porosity, large specific surface area effect

Active Publication Date: 2022-01-14
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

However, enriching a large amount of heavy metals in plants in polluted sites reduces the environmental risk of the soil, but produces a large amount of polluted biomass
Studies have shown that these heavy metals cannot be degraded by plants or biomass, and once released back to the environment, they will cause secondary pollution to soil and groundwater

Method used

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  • An improved heavily polluted porous biochar and its preparation method
  • An improved heavily polluted porous biochar and its preparation method
  • An improved heavily polluted porous biochar and its preparation method

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preparation example Construction

[0018] In one aspect of the present invention, its object is to provide a preparation method for improving heavily polluted biochar, said method comprising:

[0019] Step 1, preparing biochar.

[0020] According to a preferred embodiment, the step 1 includes:

[0021] Step 1-1, planting plants in heavy metal polluted water or constructed wetlands;

[0022] Step 1-2, harvesting the plants planted in step 1-1 to prepare biomass;

[0023] Step 1-3, calcining the biomass obtained in step 1-2 and the passivating agent.

[0024] in particular:

[0025] In step 1-1, the plant is an aquatic plant, preferably an emergent plant, such as sagittaria, pampas grass, reed, umbrella sedge, etc., more preferably sagittaria.

[0026] According to the present invention, the emergent plants have well-developed aerenchyma and well-developed underground rhizomes or tubers, and their dredging tissues, mechanical tissues and protective tissues are well developed, and have well-developed aerenchym...

Embodiment 1

[0086] (1) Rinse the pool with clean water, then lay sand and non-polluting soil with a particle size of less than 3mm in the pool with a thickness of 20cm, fill the pool with water to 30cm, and plant 12 Arthias sagitta in the soil of the pool, After one week, adding the lead element concentration in the pond is the lead nitrate solution of 300mg / L, and the cadmium element concentration is the cadmium chloride solution of 90mg / L, uses urea (purchased from Jinan Xinyu Chengtai Chemical Technology Co., Ltd.) fertilize, and the amount of fertilization is 40g / m each time 2 , on the 120th day of Arrowhead's growth, the Arrowhead was collected, dried at a temperature of 85° C. for 3 hours, and then crushed to a size of 13 mm to obtain biomass.

[0087] (2) Crush the attapulgite to 3mm, activate it at 400°C for 2 hours, and set aside.

[0088] (3) Biomass, diatomite, natural zeolite and attapulgite (by dry weight) with a weight ratio of 1:0.3:0.4:0.35 are operated as follows:

[00...

experiment example 1

[0098] Referring to "Microwave Digestion Method of Total Heavy Metals in Soil (HJ832-2017)", accurately weigh 0.200g of the porous biochar prepared in the embodiment into a polytetrafluoroethylene digestion tank, add 9mL of concentrated nitric acid and 3mL of concentrated HCl, and let stand Allow it to react for 12 hours, and then put it into a microwave digestion apparatus for digestion to obtain a digestion solution. After the digestion is completed, transfer the digestion liquid to a 100mL 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 metal elements Pb and Cd in the filtrate, and convert to Content of heavy metals in porous biochar solids, namely: Pb 2+ The total amount of enrichment is 76mg / g, Cd 2+ The enriched total amount of 21mg / g.

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Abstract

The invention discloses an improved heavily polluted porous biochar and a preparation method thereof. Utilize Sagittarius, which has an excellent effect on lead enrichment, to absorb heavy metal lead in polluted water or constructed wetlands, and at the same time absorb heavy metal cadmium, dry it as biomass, and calcinate in stages with a passivator in a high-temperature environment to stabilize heavy metal lead and cadmium Coated or enriched in biochar, and then mixed with Pseudomonas aeruginosa with strong stress resistance to make porous biochar. The porous biochar of the present invention has large specific surface area, high porosity, excellent mechanical properties, and is very stable under different acid-base environments and oxidation conditions. The method uses passivating agents such as diatomite, zeolite and attapulgite The effect between them can effectively prolong the migration time of heavy metals lead and cadmium, and reduce the potential danger of heavy metals lead and cadmium to the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental preparation, and in particular relates to an improved heavily polluted porous biochar and a preparation method thereof. Background technique [0002] Since the 1950s, with the substantial increase in population, the rapid development of mining, smelting and manufacturing industries, the extensive use of agricultural chemicals and the discharge of urban sewage and sewage, lead, cadmium, mercury, copper, etc. The rapid and excessive accumulation of biologically toxic metal elements in the environment has attracted widespread attention as an environmental pollution problem caused by human activities. [0003] In particular, the sewage problem of heavy metals directly affects human health, so it has become a top priority. If the treatment of sewage is not perfect, it will cause great pollution to the land and water sources, especially cadmium and lead, because cadmium is easily absorbed by crop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30
CPCB01J20/20B01J20/12B01J20/14B01J20/16Y02W10/37
Inventor 张根潘璐璐王静
Owner 维塔探索(广东)科技有限公司
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