Preparation method and application of biochar-based conditioner for cadmium contaminated soil

A technology for cadmium-contaminated soil and biochar, applied in the restoration of polluted soil, soil conditioning materials, applications, etc., can solve problems such as complicated processes and secondary pollution, achieve simple process, enhance passivation, and reduce phosphorus. effect of dissolution

Active Publication Date: 2018-03-13
HUNAN DINGJIU ENERGY & ENVIRONMENT TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is also possible to load calcium on biochar and then adsorb phosphorus,...

Method used

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  • Preparation method and application of biochar-based conditioner for cadmium contaminated soil
  • Preparation method and application of biochar-based conditioner for cadmium contaminated soil

Examples

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Embodiment 1

[0055] This embodiment is a preparation method of a biochar-based cadmium-contaminated soil conditioner, comprising the following steps:

[0056] 1) Mix wood chips and sludge at a mass ratio of 4:1 to prepare a mixture, adjust the moisture content to about 70%, and mix the limestone and the mixture again at a ratio of 5:1, and then carry out in an oxygen-free environment Carbonization, the temperature of carbonization is 600°C, and the carbonization time is 2h to prepare calcium-loaded biochar; wherein the content of organic matter in the sludge is 30%;

[0057] 2) Mix zeolite powder and potassium dihydrogen phosphate in a mass ratio of 8:1, add 1.2 times of water and stir evenly, and leave for 1 hour to obtain phosphorus-modified zeolite;

[0058] 3) Mix calcium-containing biochar and phosphorus-containing zeolite powder at a mass ratio of 5:1, and add modified starch with a mass percentage of 1%, keep the moisture content at 20%, age for 4 days, and dry through a 10-mesh sie...

Embodiment 2

[0060] This embodiment is a preparation method of a biochar-based cadmium-contaminated soil conditioner, comprising the following steps:

[0061] 1) Mix sawdust and sludge at a mass ratio of 3:1 to prepare a mixture, adjust the moisture content to about 80%, mix raw gypsum and the mixture again at a ratio of 5:1, and carry out the process in an oxygen-free environment. Carbonization, the temperature of carbonization is 400°C, and the carbonization time is 2h to prepare calcium-loaded biochar; wherein the content of organic matter in the sludge is 30%;

[0062] 2) Mix zeolite powder and potassium dihydrogen phosphate in a mass ratio of 6:1, add 1.2 times of water and stir evenly, and leave for 1 hour to obtain phosphorus-modified zeolite;

[0063] 3) Mix calcium-containing biochar and phosphorus-containing zeolite powder at a mass ratio of 5:1, and add modified starch with a mass percentage of 1%, keep the moisture content at 25%, age for 4 days, and dry through a 10-mesh sieve...

Embodiment 3

[0065] This embodiment is a preparation method of a biochar-based cadmium-contaminated soil conditioner, comprising the following steps:

[0066] 1) Mix wood chips and sludge at a mass ratio of 4:1 to prepare a mixture, adjust the moisture content to about 80%, mix raw gypsum and the mixture again at a ratio of 3:1, and carry out the process in an oxygen-free environment. Carbonization, the temperature of carbonization is 480°C, and the carbonization time is 2h to prepare calcium-loaded biochar; wherein the content of organic matter in the sludge is 30%;

[0067] 2) Mix zeolite powder and potassium dihydrogen phosphate at a mass ratio of 6:1, add 1.5 times of water, stir evenly, and leave for 1 hour to obtain phosphorus-modified zeolite.

[0068] 3) Mix calcium-containing biochar and phosphorus-containing zeolite powder at a mass ratio of 4:1, add 1% modified starch by mass, keep the moisture content at 25%, age for 6 days, and dry through a 10-mesh sieve , to produce biochar...

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Abstract

The invention relates to a preparation method and the application of a biochar-based conditioner for cadmium contaminated soil. The preparation method comprises the following steps: firstly, mixing biologic materials with sludge, or separately using the sludge and adjusting the moisture content to 10 to 90 percent; adding calcareous materials, carrying out high-temperature carbonization in the oxygendeficit or oxygen-free environment to obtain calcium-loaded biochar; secondly, adding a zeolite powder into a soluble phosphorus solution, carrying out soaking treatment, standing and carrying outair drying to obtain phosphorus modified zeolite; thirdly, uniformly mixing the calcium-loaded biochar obtained in the first step with the phosphorus modified zeolite obtained in the second step according to the ratio of 2-5 to 1, moisturizing, aging and drying, so as to obtain a finished product. The preparation method disclosed by the invention has the advantages of simple technology, low energyconsumption and no pollution discharge in the processing process. The biochar-based conditioner for the cadmium contaminated soil is mixed with the soil for use according to a certain proportion, sothat the absorption of plants to heavy metal cadmium can be reduced by 30 to 50 percent.

Description

technical field [0001] The invention relates to a preparation method of a soil conditioner, in particular to a preparation method and application of a biochar cadmium polluted soil conditioner. Background technique [0002] The heavy metal cadmium is a non-essential element for the human body, and if it exceeds the standard in the human body, it may cause various diseases. The World Health Organization recommends that the daily intake of cadmium should not exceed 68 μg. However, cadmium pollution in food can easily lead to excessive intake of cadmium in the human body. Studies have shown that rice is a cereal crop with a strong ability to absorb cadmium. Therefore, it is particularly important to adjust the cadmium content in rice fields. [0003] Biochar is a new type of material, which has the characteristics of loose and porous, large specific surface area, and a large amount of negative charge on the surface. These characteristics make biochar have good adsorption char...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 姜良军罗惠莉王宇霖马贵权周颖
Owner HUNAN DINGJIU ENERGY & ENVIRONMENT TECH LTD
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