Preparation method of sulfurized modified charcoal soil restoration conditioner

A soil remediation and biochar technology, applied in the field of heavy metal contaminated soil remediation agents, can solve the problems of soil structure damage by adjusting the pH range, failure to improve soil fertility, and reduced heavy metal stabilization effect, and achieve the effect of improving soil fertility

Active Publication Date: 2016-08-17
HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the defects in the above-mentioned prior art, the present invention aims to provide a preparation method of a vulcanized modified biochar soil remediation conditioner, which can effectively solve the problem that the existing general inorganic remediation agent is easy to reduce the stability of heavy metals as the pH of the environment changes. , and mostly due to the large range of pH adjustment, it is easy to cause soil structure damage and cannot improve soil fertility. It can also solve the existing problems of using humus and biochar for soil improvement. Heavy metals in soil only use functional groups such as hydroxyl groups for surface adsorption or The problem of poor stability and easy release of heavy metals caused by ion exchange adsorption

Method used

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  • Preparation method of sulfurized modified charcoal soil restoration conditioner
  • Preparation method of sulfurized modified charcoal soil restoration conditioner
  • Preparation method of sulfurized modified charcoal soil restoration conditioner

Examples

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Effect test

Embodiment 1

[0023] A preparation method of a vulcanized modified biochar soil remediation conditioner is carried out according to the following process steps:

[0024] Step S1: Pyrolysis and carbonization of rice straw at a temperature of 400° C. for 2 hours under anoxic conditions to obtain biochar;

[0025] Step S2: crush the diatomite, sieve through a 120-mesh sieve, and set aside;

[0026] Step S3: mixing sodium sulfide and sieved diatomite in a mass ratio of 1:10, placing them at a temperature of 150°C for 60 minutes for sulfidation modification, and forming sulfide-modified diatomite;

[0027] Step S4: Compost the sulfide-modified diatomite, cow dung, and biochar at a mass ratio of 1:45:55, control the carbon-nitrogen ratio at 30:1, control the moisture content at 60%, and stir regularly every day Turn over to avoid local hypoxia. After composting under heat preservation conditions for 25 days, the temperature at the end of the high temperature stage drops to normal temperature, an...

Embodiment 2

[0029] A preparation method of a vulcanized modified biochar soil remediation conditioner is carried out according to the following process steps:

[0030] Step S1: Pyrolysis and carbonization of corn cobs at a temperature of 600°C under anaerobic conditions to obtain biochar;

[0031] Step S2: crush the bentonite, sieve through a 120-mesh screen, and set aside;

[0032] Step S3: mixing the elemental sulfur with the sieved bentonite in a mass ratio of 1:100, and then placing it at a temperature of 120° C. for 70 minutes for vulcanization modification to form vulcanization modified bentonite;

[0033] Step S4: Mix and compost the vulcanized modified bentonite, chicken manure, and biochar at a mass ratio of 5:35:55, control the carbon-nitrogen ratio at 30:1, control the moisture content at 50%, and stir and stir regularly every day. To avoid local hypoxia, after 30 days of composting under heat preservation conditions, the temperature at the end of the high-temperature stage dr...

Embodiment 3

[0035] A preparation method of a vulcanized modified biochar soil remediation conditioner is carried out according to the following process steps:

[0036] Step S1: Pyrolysis and carbonization of bagasse at a temperature of 500° C. for 1 hour in the absence of oxygen to obtain biochar;

[0037] Step S2: Crushing the zeolite, sieving through a 120-mesh sieve, and setting aside;

[0038] Step S3: mixing thiourea and the sieved zeolite in a mass ratio of 1:50, and then placing them at a temperature of 120° C. for 65 minutes to perform vulcanization modification to form a vulcanization-modified zeolite;

[0039] Step S4: Mix and compost sulfurized modified zeolite, chicken manure, and biochar at a mass ratio of 2:43:55, control the carbon-nitrogen ratio at 35:1, compost for 30 days, and control the moisture content at 55% , Stir regularly every day to avoid local hypoxia. After 30 days of composting under heat preservation conditions, the temperature at the end of the high temper...

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Abstract

The invention provides a preparation method of a sulfurized modified charcoal soil restoration conditioner. The method comprises the following technological steps that 1, biomass is placed under the temperature of 400-600 DEG C for pyrolysis carbonization for 1-2 h, and charcoal is obtained; 2, clay minerals are smashed and screened by a 120-mesh screen for use; 3, a sulfurizing agent and the screened clay minerals are mixed according to the mass ratio being (1-10):100 and placed under the temperature of 100-150 DEG C for 60-70 min, sulfurized modified clay is formed; 4, the sulfurized modified clay, livestock manure and charcoal are mixed according to the mass ratio of (0.5-5):(35-45):55 for composting, the carbon nitrogen ratio is controlled to be (30-35):1, the composting time is 20-30 d, the water content is controlled to be 50-60%, and the soil restoration conditioner is formed. Heavy metal in soil can be efficiently stabilized and slightly affected by environmental changes such as pH; organic matters, nitrogen and other soil nutrient elements in restored soil can be improved and soil fertility can be effectively improved while heavy metal in the soil can be stabilized and the soil structure is not damaged.

Description

technical field [0001] The invention relates to a heavy metal polluted soil remediation agent, in particular to a preparation method of a vulcanized modified biochar soil remediation conditioner. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection in April 2014, the total point exceeding the standard rate of the country's soil is 16.1%, and the number of points exceeding the standard for inorganic pollutants mainly polluted by heavy metals such as cadmium, mercury, and arsenic Accounting for 82.8% of the total over-standard points; soil heavy metal pollution has the characteristics of long-term, concealment and irreversibility, which will directly or indirectly pollute surface water, groundwater, air, plants and crops, and even endanger human health and life; therefore , Remediation of heavy metal-contaminated soil and restoration of the original function of the soil have always been diff...

Claims

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Application Information

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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 张光文黄爱知罗波梁雪梅汤慧李少雄刘蕾郭宁周杨周来丰
Owner HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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