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Soil restoration agent for restoring heavy metal polluted soil and preparation method thereof

A pollution remediation and heavy metal technology, applied in the field of soil remediation, can solve the problems of soil re-pollution, single biochar pores, and limited adsorption capacity, and achieve good economic value, increase nutrients, and enhance stability.

Inactive Publication Date: 2019-11-15
安徽禾美环保集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the remediation technology of heavy metal-contaminated soil mainly adopts chemical means, but a large number of chemical agents used in the remediation process can easily cause soil re-pollution
Biochar has good adsorption performance, stable chemical properties, can reduce the bioavailability of heavy metals in soil, and can increase crop yield at the same time, and has a wide range of raw materials and low cost, which makes it have obvious advantages and application value in the treatment of heavy metal polluted soil , but the traditional biochar has a single hole and limited adsorption capacity, so the restoration agent used in it still needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A soil heavy metal pollution remediation agent, comprising the following components in parts by mass: 36 parts of peat soil, 11 parts of lignite, 28 parts of porous modified biochar, 7 parts of composite bacterial powder, 9 parts of humic acid, and 9 parts of medical stone .

[0027] The preparation method of described porous modified biochar comprises the following steps:

[0028] (1) Dry and crush the coconut shell through a 55-mesh sieve, then immerse it in the phosphoric acid solution for 14 hours, then take it out and put it in a high-temperature furnace, heat it up to 450°C and activate it for 2 hours, then cool it down, take it out and wash it with water until it becomes neutral for later use ;

[0029] (2) Submerge the above product in 25% nitric acid solution, stir at 55°C for 5 hours, and then wash with water until neutral;

[0030] (3) Mix and disperse the obtained product in step 2 with an equal mass of N, N dicyclohexylcarbodiimide in ethylenediamine, ref...

Embodiment 2

[0039] A soil heavy metal pollution remediation agent, comprising the following components in parts by mass: 34 parts of peat soil, 10 parts of lignite, 25 parts of porous modified biochar, 5 parts of composite bacterial powder, 8 parts of humic acid, and 8 parts of medical stone .

[0040] The preparation method of described porous modified biochar comprises the following steps:

[0041] (1) Dry and crush the coconut shell through a 50-mesh sieve, then immerse it in the phosphoric acid solution for 12 hours, then take it out and put it in a high-temperature furnace, heat it up to 400°C and activate it for 2 hours, then cool it down, take it out and wash it with water until it becomes neutral for later use ;

[0042] (2) Submerge the above product in 25% nitric acid solution, stir at 50°C for 4 hours, then wash with water until neutral;

[0043] (3) Mix and disperse the obtained product in step 2 with an equal mass of N, N dicyclohexylcarbodiimide in ethylenediamine, reflux ...

Embodiment 3

[0052] A soil heavy metal pollution remediation agent, comprising the following components in parts by mass: 38 parts of peat soil, 12 parts of lignite, 30 parts of porous modified biochar, 8 parts of composite bacterial powder, 10 parts of humic acid, and 12 parts of medical stone .

[0053] The preparation method of described porous modified biochar comprises the following steps:

[0054] (1) Dry and crush the coconut shell through a 60-mesh sieve, then immerse it in the phosphoric acid solution for 16 hours, then take it out and send it to a high-temperature furnace, heat it up to 500°C for constant temperature activation for 3 hours, cool it down, take it out and wash it with water until it is neutral for later use ;

[0055] (2) Submerge the above product in 25% nitric acid solution, stir at 60°C for 5 hours, then wash with water until neutral;

[0056] (3) Mix and disperse the obtained product in step 2 with an equal mass of N, N dicyclohexylcarbodiimide in ethylenediami...

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Abstract

The invention discloses a soil restoration agent for restoring heavy metal polluted soil and a preparation method thereof. The soil restoration agent is prepared from turfy soil, brown coal, porous modified biocarbon, composite bacterium powder, and medical stone. The preparation method comprises following steps: (1) weighing all raw materials according to a formula; (2) adding brown coal and medical stone into a pulverizer, and grinding the brown coal and medical stone; (3) adding all raw materials into a high speed mixing machine, stirring, and evenly mixing; and (4) carrying out wet granulation to convert the mixture into granules, namely the soil restoration agent. The raw materials are easily available, the preparation technology is scientific, and the soil restoration agent can restore soil polluted by various heavy metals, is capable of improving the quality and structure of soil and increasing the nutrients of soil, and creates great social benefits, economic benefits, and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a soil heavy metal pollution remediation agent and a preparation method thereof. Background technique [0002] According to the national soil pollution survey data, the total over-standard rate of polluted soil nationwide is 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1%, respectively. At present, the types of pollution in China are dominated by inorganic pollutants, followed by organic pollutants, and the proportion of compound pollutants is relatively small. Among them, the number of points exceeding the standard for inorganic pollutants accounts for 82.8% of all the points that exceed the standard. [0003] From the perspective of pollution distribution, soil pollution in the south is more serious than that in the north; the problem of soil pollution in some areas such as the Yangt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/10
CPCB09C1/00B09C1/10C09K17/40
Inventor 吴俊熊寅寅
Owner 安徽禾美环保集团有限公司
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