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Preparation method of modified remediation plant biochar for remediation of cadmium-contaminated soil

A technology for cadmium-contaminated soil and repairing plants, applied in the field of repairing plant biochar, can solve the problems of increasing the risk of heavy metal leaching, high economic cost, and poor effect

Inactive Publication Date: 2020-10-27
江苏省地质工程勘察院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods are accompanied by many problems, such as high economic cost, poor effect, etc.
At the same time, such modification methods may increase the risk of leaching heavy metals contained in remediation plant biochar

Method used

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  • Preparation method of modified remediation plant biochar for remediation of cadmium-contaminated soil
  • Preparation method of modified remediation plant biochar for remediation of cadmium-contaminated soil
  • Preparation method of modified remediation plant biochar for remediation of cadmium-contaminated soil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment provides a method for preparing a modified and repaired plant biochar for remediation of cadmium-contaminated soil. The specific process is as follows:

[0031] (1) Take the cadmium content as 0.14 mg·kg -1 The rapeseed is washed with deionized water, dried in an oven to constant weight, ground and passed through a 50-mesh sieve to obtain biomass raw materials, which are ready for use;

[0032] (2) Put rapeseed in a tube furnace, at 0.5L·min -1 The rate of continuous feeding of nitrogen, heating to 600 ℃, the residence time is 1h, after the temperature in the furnace is naturally cooled to room temperature, it is taken out, and after grinding through a 100-mesh sieve, rape biochar is obtained, which is ready for use;

[0033] (3) Take 10 g of rape biochar and spread it on a glass vessel of about 2 mm, and place the petri dish on an electric hot plate to keep the temperature of the biochar at 80°C. Then it was placed under a 250W UV lamp for 16h,...

Embodiment 2

[0036] The present embodiment provides a method for preparing a modified and repaired plant biochar for remediation of cadmium-contaminated soil. The specific process is as follows:

[0037] (1) Take the cadmium content as 0.14 mg·kg -1 The rapeseed is washed with deionized water, dried in an oven to constant weight, ground and passed through a 50-mesh sieve to obtain biomass raw materials, which are ready for use;

[0038] (2) Put rapeseed in a tube furnace, at 0.5L·min -1 Nitrogen was continuously introduced into the furnace at a rate of 400°C, and the residence time was 2h. After the temperature in the furnace was naturally cooled to room temperature, it was taken out, and after being ground through a 100-mesh sieve, the rape biochar was obtained, which was ready for use;

[0039] (3) Take 10 g of rape biochar and spread it on a glass vessel of about 2 mm, and place the petri dish on an electric hot plate to keep the temperature of the biochar at 80°C. Then it was placed ...

Embodiment 3

[0042] The present embodiment provides a method for preparing a modified and repaired plant biochar for remediation of cadmium-contaminated soil. The specific process is as follows:

[0043] (1) Take the cadmium content as 3.86 mg·kg -1 The ryegrass were washed with deionized water, dried in an oven to a constant weight, ground and passed through a 50-mesh sieve to obtain biomass raw materials, which are ready for use;

[0044] (2) Place the ryegrass in a tube furnace, at 0.5L·min -1 The rate of continuous feeding of nitrogen, heating to 600 ℃, the residence time is 1h, after the temperature in the furnace is naturally cooled to room temperature, take it out, grind through a 100-mesh sieve, and obtain ryegrass biochar, which is ready for use;

[0045] (3) Take 10 g of ryegrass biochar and spread it on a glass vessel of about 2 mm, and place the petri dish on an electric hot plate to keep the temperature of the biochar at 80°C. Then it was placed under a 250W UV lamp for 16h, a...

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Abstract

The invention discloses a preparation method of modified remediation plant biochar for cadmium-contaminated soil remediation. The preparation method comprises the following steps: (1) harvesting remediation plants containing a certain concentration of heavy metals, washing, drying, crushing and screening to obtain biomass raw materials; (2) putting the biomass into a tubular furnace in a nitrogenatmosphere for high-temperature carbonization, keeping the pyrolysis temperature at 400-700 DEG C and the retention time at 1-2 hours, cooling to room temperature, and grinding to obtain remediation plant biochar with different pyrolysis temperatures; (3) taking a certain mass of repair plant biochar, flatly laying the repair plant biochar in a glass ware of about 2 mm, and irradiating the repairplant biochar under a 250 W ultraviolet lamp for 8-24 h; and (4) taking out the culture dish after the irradiation is finished to obtain the modified repair plant biochar. The remediation plant biochar prepared by the method is low in toxic leaching amount, has environmental acceptability, and is simple in preparation method, the modified biochar effectively inhibits the effectiveness and mobilityof heavy metals in soil, and dual values of safe disposal and resource reutilization of hazardous wastes are realized.

Description

technical field [0001] The present invention relates to the technical field of environmental protection, in particular to a treatment for plants containing heavy metal cadmium after remediation of cadmium-contaminated soil, which is prepared into remediation plant biochar and the above-mentioned biochar is modified for reuse. Background technique [0002] Heavy metal pollution in soil has become an environmental problem that needs to be solved urgently. Large amounts of heavy metals accumulated in soil are mainly caused by human activities, such as mining, wastewater and pesticides. As one of the major heavy metal pollutants, cadmium poses a serious threat to the safety of the entire agricultural production due to its extremely high toxicity and non-biodegradability. Multiple studies have shown that the presence of excess cadmium in soil can negatively affect plant growth, including brown spotting, curling and even leaf drop. In addition, cadmium accumulated in foods such ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C09K17/02B09C1/00
CPCB01J20/20B09C1/00C09K17/02
Inventor 周红卫张亚平陈振焱施春华郭华
Owner 江苏省地质工程勘察院
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