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Method for remediating cadmium-contaminated soil by combining biochar and plants

A technology for combined restoration of cadmium-contaminated soil, applied in the field of combined restoration of cadmium-contaminated soil with biochar and plants, can solve problems such as secondary pollution of the ecological environment, and achieve the effects of large adsorption capacity, low cost, and easy management.

Pending Publication Date: 2019-12-31
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, it only changes the form of heavy metals, and does not fundamentally remove heavy metals in the soil, and the added chemical reagents may also cause secondary pollution to the ecological environment

Method used

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Embodiment Construction

[0023] The present invention can be better understood from the following examples. However, those skilled in the art can easily understand that the content described in the embodiments is only for illustrating the present invention, and should not and will not limit the present invention described in the claims. The ryegrass used in the following examples is a commercially available grass species, and the used wheat and corn stalks are commercially available straw powder.

[0024] A method for jointly repairing cadmium-contaminated soil with biochar and plants, comprising the following steps:

[0025] Step 1: Preparation of biochar

[0026] Crush wheat and corn stalks into 20-mesh granules, put them in a crucible with a cover, and cover them to isolate oxygen. Turn on the muffle furnace switch, put the crucible into the furnace, set the preheating time for 30 minutes, raise the temperature to 400°C for 2 hours, and then turn off the power supply of the muffle furnace after c...

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Abstract

The invention discloses a method for remediating cadmium-contaminated soil by combining biochar and plants. The method comprises the following steps: (1) treating biological straw to prepare biochar;(2) performing physical treatment on soil; (3) carrying out chemical treatment on the physically treated soil to obtain cadmium-contaminated soil; (4) adding the biochar into the cadmium-contaminatedsoil, uniformly mixing, and then planting ryegrass; and (5) in the ryegrass planting period, taking soil samples at intervals of 7 days for cadmium content determination, harvesting ryegrass 45 days after planting, and determining the cadmium content of each soil sample and the cadmium content of stems, leaves and roots of harvested ryegrass. The biochar prepared by the method is loose and porous,has tubular channels, large specific surface area and great adsorption capacity, is beneficial to growth and propagation of ryegrass, enhances the enrichment effect of ryegrass, better adsorbs heavymetals in soil, does not generate secondary pollution, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental remediation, and in particular relates to a method for jointly remediating cadmium-contaminated soil with biochar and plants. Background technique [0002] In recent years, controlling and mitigating the pollution and harm of heavy metals to the environment has become a focal issue no matter in China or in the world. Compared with water pollution and air pollution, soil heavy metal pollution is invisible and concealed. At present, the methods used to remediate heavy metals in soil at home and abroad mainly include physical methods, chemical methods and biological methods. Physical methods include thermal desorption method, electrochemical method and extraction method to control soil heavy metal pollution. Among them, the engineering measures commonly used in practice mainly include measures such as soil replacement, borrowed soil, and deep plowing. However, the amount of engineering is la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 李亚林刘蕾王淑晴张赛超唐一凡周垟
Owner HENAN INST OF ENG
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