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Composting contaminated soil restoration method through straw

A polluted soil and composting technology, which is applied in the field of resource utilization of agricultural organic waste and soil composting repair, can solve the problems of further improvement of repair effect, easy loss of nutrients, unfavorable repair effect, etc., and achieve reduction treatment and resource utilization, reduce ecological risk, reduce cost and pollution effects

Inactive Publication Date: 2017-06-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two types of technologies have the advantages of low cost, simple process, and wide repair range, they have disadvantages such as easy loss of nutrients and unstable effects, and the repair effect needs to be further improved.
At the same time, since there are many kinds of pollutants in the polluted soil, and the interaction between these pollutants will inhibit the growth and reproduction of microorganisms, which is not conducive to the improvement of the restoration effect. The restoration method of material effectiveness is very necessary

Method used

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  • Composting contaminated soil restoration method through straw
  • Composting contaminated soil restoration method through straw
  • Composting contaminated soil restoration method through straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for realizing composting and repairing polluted soil by using straw, comprising the following steps:

[0030] (1) Preparation of biochar: Under anoxic conditions, the natural air-dried straw was heated to 500°C at a heating rate of 10°C / min and pyrolyzed for 2 hours to obtain biochar, which was crushed and sieved to obtain a particle size smaller than 1mm powder, spare.

[0031](2) Preparation of active biochar: by mass volume ratio is 1g: 10ml (mass volume ratio is 1g: 10ml~20ml all can), the biochar in step (1) is mixed with the hydrochloric acid solution that concentration is 1mol / L, Soak the biochar with hydrochloric acid solution, shake it fully for 1 hour, filter, rinse with deionized water several times to remove residual hydrochloric acid, place it in a drying oven, and dry it at 105°C for 12 hours (drying time at 100°C-150°C It can be 12h~24h) to obtain activated biochar, and set it aside.

[0032] (3) Preparation of composting initial raw materials:...

Embodiment 2

[0058] A method for realizing composting and repairing polluted soil by using straw, comprising the following steps:

[0059] (1) Preparation of biochar: same as Example 1.

[0060] (2) Preparation of active biochar: same as Example 1.

[0061] (3) Preparation of starting material for composting: same as in Example 1.

[0062] (4) Composting treatment: Add the activated biochar in step (2) to the composting initial raw material in step (3) at a ratio of 5% of the fresh weight of the composting initial raw material, mix well and carry out composting treatment for 42 days . During composting, adjust the moisture content in a timely manner to keep the moisture content of the compost at 45% to 60%. In order to avoid local anaerobic in the pile, turn the pile once a day during the composting period until the composting material forms humus.

Embodiment 3

[0064] A method for realizing composting and repairing polluted soil by using straw, comprising the following steps:

[0065] (1) Preparation of biochar: same as Example 1.

[0066] (2) Preparation of active biochar: same as Example 1.

[0067] (3) Preparation of starting material for composting: same as in Example 1.

[0068] (4) Composting treatment: Add the activated biochar in step (2) to the composting initial raw material in step (3) at a ratio of 10% of the fresh weight of the composting initial raw material, and carry out composting treatment for 42 days after mixing evenly . During composting, adjust the moisture content in a timely manner to keep the moisture content of the compost at 45% to 60%. In order to avoid local anaerobic in the pile, turn the pile once a day during the composting period until the composting material forms humus.

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Abstract

The invention discloses a composting contaminated soil restoration method through straw. The method comprises the following steps that the straw is mixed with contaminated soil, initial compost raw materials are obtained and mixed with active biological carbon for composting treatment, and restoration of the contaminated soil is completed. The restoration method is capable of simultaneously reducing the effectiveness of various pollutants and has the advantages of low cost, simple process, convenient operation, high restoration efficiency, free of toxic and side effect and the like. Through the method, stacking of agricultural straw can be reduced, reduction treatment and resource utilization of agricultural straw solid waste are achieved, the pollutants in the soil can be effectively removed, and efficient restoration of the contaminated soil is achieved. The in-site restoration method is adopted, cost and pollution caused by transportation of raw materials or the contaminated soil can be reduced, meanwhile, the physicochemical property of the contaminated soil can be improved, the restored soil can be used for subsequent resource recycling, and the method has wide application prospects.

Description

technical field [0001] The invention belongs to the fields of resource utilization of agricultural organic waste and soil composting restoration, and relates to a method for realizing composting restoration of polluted soil by utilizing straw. Background technique [0002] As the carrier of decomposers (soil microorganisms), soil is an important link in the transformation of global material and energy cycles, and an important basis for human production activities. At present, my country's soil pollution is relatively serious, and the quality of cultivated land soil environment is worrying, showing the coexistence of new and old pollutants, and the situation of inorganic and organic compound pollution. A series of ecological security problems caused by soil pollution cannot be ignored: soil pollution will disturb the natural ecological balance, change the composition, structure and properties of the soil, and lead to the natural dysfunction of the soil. The pollutants in the...

Claims

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Application Information

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IPC IPC(8): B09C1/00C05F5/00C05F17/00
CPCB09C1/00C05F5/002C05F17/00Y02W30/40Y02A40/20
Inventor 曾光明叶淑静武海鹏张长梁婕宋彪吴少华胡凯李晓沛
Owner HUNAN UNIV
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