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Chicken manure/corn straw composite co-pyrolysis activated carbon soil remediation agent, preparation method thereof and application of remediation agent

A soil remediation agent and corn stalk technology, applied in the field of organic dye contaminated soil adsorbent and heavy metal field, can solve problems such as negative impact on the soil environment, and achieve the effects of large ash content, developed pore structure and high specific surface area

Active Publication Date: 2019-10-08
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used modifiers include lime, phosphate and industrial waste (furnace slag, blast furnace slag powder) and other long-term use will have a negative impact on the soil environment or become invalid.

Method used

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  • Chicken manure/corn straw composite co-pyrolysis activated carbon soil remediation agent, preparation method thereof and application of remediation agent
  • Chicken manure/corn straw composite co-pyrolysis activated carbon soil remediation agent, preparation method thereof and application of remediation agent
  • Chicken manure/corn straw composite co-pyrolysis activated carbon soil remediation agent, preparation method thereof and application of remediation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Pretreatment for the preparation of chicken manure / corn stalk composite particles: chicken manure comes from a chicken farm in Yancheng, Jiangsu, and corn stalks come from a corn field in Yunnan; the raw materials are placed on iron trays and placed in a vacuum oven at 105°C for more than 12 hours. Ensure complete drying; use a large traditional Chinese medicine grinder for crushing (speed 25000r / min); then use an 80-mesh sieve to screen the required powder;

[0055] (2) Preparation of chicken manure / corn stalk composite spherical particles: the raw materials of chicken manure powder and corn stalk powder were respectively mixed at 0:10 (ie without chicken manure), 2:8, 4:6, 5:5, 6: 4. The mass ratio of 8:2, 10:0 (that is, without corn stalks) is mixed and placed in a 1000mL large beaker, and then the content is weighed to be 40%, which means corn starch / raw material (chicken manure + straw) = 40 %, that is, the amount of binder accounts for 40% of the cornstarch bi...

Embodiment 2

[0075] Apparent adsorption of soil for heavy metal adsorption: Weigh 0.8g of 20-mesh air-dried soil (the air-dried soil comes from South China Agricultural University, dig about 20cm deep, and the soil quality is uniform) and 0.16g of granular activated carbon (that is, the chicken manure prepared in Example 1 / Corn straw co-pyrolysis compound activated carbon heavy metal polluted soil remediation agent C 1 、C 2 、C 3 、C 4 、C 5 、C 6 ), placed in a 50mL centrifuge tube (polyethylene plastic bottle), the mass ratio of carbon to soil was 1:5, and 25mL of pH 4.8 buffer solution (containing 0.07mol / L sodium acetate and 0.03mol / L acetic acid) was added to the centrifuge tube, Place on a constant temperature shaker at 20°C and vibrate at 150rpm for 2h, then add 0.2mL of 0.2mol / L Cu(NO 3 ) 2 solution, so that the initial solution Cu 2+ The concentration is 1mmol / L; placed on a constant temperature oscillator at 20°C at 150rpm for 2h, then quickly taken out, placed in a centrifug...

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Abstract

The invention discloses a chicken manure / corn straw composite co-pyrolysis activated carbon soil remediation agent, a preparation method thereof and an application of the remediation agent. The methodincludes the steps: (1) drying chicken manure and corn straws, crushing the dried chicken manure and the dried corn straws, and screening the crushed chicken manure and the crushed corn straws to obtain chicken manure powder and corn straw powder; (2) uniformly mixing the chicken manure powder and the corn straw powder, adding binding agents, uniformly heating and stirring mixture, and granulating and drying the mixture to obtain composite spherical particles; (3) heating the composite spherical particles to reach the temperature of 400-600 DEG C to carbonize the particles for 1-2 hours, heating the particles to reach the temperature of 750-850 DEG C, leading in water vapor to activate the particles for 20-40 minutes, and cooling the particles to reach room temperature to obtain the chicken manure / corn straw composite co-pyrolysis activated carbon soil remediation agent. The prepared activated carbon soil remediation agent is high in specific surface area and has rich pore structures,and physical absorption is facilitated, so that the soil remediation agent can be used for adsorbing soil heavy mental, organic coloring agent methylene blue and the like.

Description

technical field [0001] The invention belongs to the technical field of heavy metal and organic dye polluted soil adsorbents, in particular to a chicken manure / corn stalk composite co-pyrolysis activated carbon soil repair agent and its preparation method and application. Background technique [0002] Soil pollution by heavy metals and organic dyes has become one of the most concerned global environmental pollution problems, and it is very urgent to remediate heavy metal-contaminated soil. Applying amendments is a more economical in-situ passivation method to remediate heavy metal and organic dye polluted soil. The in-situ passivation process of heavy metals in soil is related to the addition of materials, and mainly includes the following mechanisms: adsorption, precipitation, complexation, ion exchange, and redox. However, long-term use of commonly used amendments including lime, phosphate, and industrial waste (furnace slag, blast furnace slag powder) will have a negative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/336C09K17/00B01J20/20B01J20/30B09C1/00B09C1/08
CPCB01J20/20B01J2220/4825B01J2220/4887B09C1/00B09C1/08C09K17/00C01B32/324C01B32/336
Inventor 简秀梅宋艳培李彦涵蒋恩臣许细薇任永志
Owner SOUTH CHINA AGRI UNIV
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