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Soil remediation agent prepared from crop straw and biochar

A soil remediation agent and crop straw technology, which is applied in the field of soil remediation, can solve the problems of the decline in the ability of biomass char to adsorb pollutants, the fertility effect is not obvious, and the nutrient function is single, so as to achieve reduction treatment and resource utilization. , non-toxic and side effects, good repair effect

Active Publication Date: 2021-02-19
GRASSLAND RES INST OF CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the adsorption of biochar in soil reaches saturation, the ability of biochar to adsorb pollutants will decrease or no longer have the ability to adsorb pollutants.
[0006] Most of the soil conditioners currently on the market have a single nutrient function and insufficient nutrients. They lack the ability to improve soil structure, improve the microbial growth environment, and improve soil air permeability, and their stability is poor, and the fertility effect is not obvious.

Method used

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  • Soil remediation agent prepared from crop straw and biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A soil remediation agent made from crop stalks and biochar, prepared by the following steps in parts by weight:

[0033] (1) Dry and pulverize the soybean stalks and carry out steam explosion treatment to prepare blasting straw powder; the straw pulverization treatment is pulverized through a 120 mesh sieve, and dried to a moisture content≤15wt%; the steam explosion treatment is: at a steam pressure of 3.5 Under the conditions of MPa and temperature 130°C, release the pressure after holding the pressure for 240s;

[0034] (2) Take 100 parts of straw powder in step (1), add 3 parts of FeCl3, 6 parts of titanate coupling agent, and 4 parts of zeolite, mix evenly, put into a pyrolysis activation device, and carry out under anaerobic conditions High-temperature pyrolysis reaction to generate biochar, the pyrolysis reaction temperature is 550°C, and the pyrolysis reaction time is 1.5h;

[0035] (3) Take 100 parts of straw powder in step (1), add 4 parts of sodium bentonite,...

Embodiment 2

[0039] A soil remediation agent made from crop stalks and biochar, prepared by the following steps in parts by weight:

[0040] (1) Dry and pulverize sorghum stalks and carry out steam explosion treatment to prepare blasting straw powder; the straw pulverization treatment is pulverized through a 10-mesh sieve, and dried to a moisture content≤15wt%; the steam explosion treatment is: at a steam pressure of 2MPa 1. Under the condition of temperature 110℃, release the pressure after holding the pressure for 200s;

[0041] (2) Take 100 parts of straw powder in step (1), add 2 parts of FeCl3, 4 parts of titanate coupling agent, and 2 parts of zeolite, mix evenly, put into a pyrolysis activation device, and carry out under anaerobic conditions High-temperature pyrolysis reaction to generate biochar, the pyrolysis reaction temperature is 500°C, and the pyrolysis reaction time is 1.5h;

[0042](3) Take 100 parts of straw powder in step (1), add 2 parts of sodium bentonite, 5 parts of ...

Embodiment 3

[0046] A soil remediation agent made from crop stalks and biochar, prepared by the following steps in parts by weight:

[0047] (1) Dry and pulverize the sugarcane stalks and carry out steam explosion treatment to prepare blasting straw powder; the straw pulverization treatment is pulverized through a 20-mesh sieve, and dried to a moisture content≤15wt%; the steam explosion treatment is: at a steam pressure of 2.2 Under the conditions of MPa and temperature 120°C, release the pressure after holding the pressure for 240s;

[0048] (2) Take 100 parts of straw powder in step (1), add 3 parts of FeCl3, 6 parts of titanate coupling agent, and 2 parts of zeolite, mix evenly, put into a pyrolysis activation device, and carry out under anaerobic conditions High-temperature pyrolysis reaction to generate biochar, the pyrolysis reaction temperature is 480°C, and the pyrolysis reaction time is 1.5h;

[0049] (3) Take 100 parts of straw powder in step (1), add 4 parts of sodium bentonite...

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Abstract

The invention provides a soil remediation agent prepared from crop straw as a raw material. The crop straw is pretreated through steam explosion, so that the utilization efficiency of effective components in the crop straw is improved, the exploded straw powder is subjected to fermentation and pyrolysis activation treatment to prepare a fermentation product of the straw and biochar respectively, the fermentation product and biochar are mixed with straw powder, attapulgite, ground phosphate rock, plant ash, an oxidant, a water-retaining agent and other auxiliary components to prepare the soil remediation agent. The soil remediation agent is good in remediation effect, free of toxic and side effects, convenient to prepare, capable of rapidly remedying soil contaminated by organic matter, especially pesticide, capable of efficiently remedying contaminated soil and capable of achieving resource utilization of biomass resources, especially crop straw.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to a soil remediation agent made of crop straw and biochar. Background technique [0002] Soil pollution has become a worldwide problem, and organic pollution, especially persistent organic pollutant pollution is a major type of soil pollution. According to preliminary statistics, there are at least 13-16 million hectares of arable land polluted by pesticides and other organic substances in my country, and the trend is increasing day by day. Soil pollution can affect the yield and quality of crops, endanger human health through the food chain, and lead to further deterioration of the quality of the air and water environment. Therefore, the control of soil pollution is urgent. [0003] Contaminated soil remediation generally reduces the concentration of pollutants in the soil to an acceptable level by transferring, adsorbing, transforming and degrading them, or transform...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/80
CPCC05B1/02C05G3/00C05G3/80C05B17/00C05C3/00C05D1/00C05D9/00C05D9/02C05F11/00C05F11/02C05F11/08Y02W30/40
Inventor 纪磊丁勇金轲张玉娟吴尧王珍焦巍宋庆成崔志强白玉连
Owner GRASSLAND RES INST OF CHINESE ACAD OF AGRI SCI
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