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Method for preparing soil conditioner by carrying out carbonization treatment on lake substrate sludge

The technology of soil conditioner and sediment is applied in the field of resource utilization of lake sediment, which can solve the problems of large amount of engineering, inconvenience and high cost, and achieve the effect of eliminating potential harm and controlling pollution.

Inactive Publication Date: 2010-06-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the implementation of this method, it is necessary to purchase excavators and mixing equipment, the amount of work is large, the cost is high, and there is inconvenience in practical application.

Method used

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  • Method for preparing soil conditioner by carrying out carbonization treatment on lake substrate sludge
  • Method for preparing soil conditioner by carrying out carbonization treatment on lake substrate sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take a certain amount of Dianchi Lake sediment that has been granulated and dried, put it into the carbonization furnace, pass in water steam to displace the air in the furnace and continue to pass in the protective gas, heat up to 400°C at a heating rate of 10°C / min, and carbonize for 60 minutes. Naturally cool to room temperature. The solid charcoal grain organic matter content that makes is 31%, and pH is 7.8, and total nutrient (N+P 2 o 5 +K 2 O) 3.6%, the maximum water holding capacity (Maximum water holding capacity) is 55%, and the heavy metal content does not exceed the standard, which can obviously improve the permeability and water holding capacity of the soil, and can provide certain nutrients.

Embodiment 2

[0024] Take a certain amount of Dianchi Lake bottom sludge that has been granulated and dried, put it into the carbonization furnace, pass in steam to replace the air in the furnace and continue to pass in the protective gas, heat up to 450°C at a heating rate of 15°C / min, and carbonize for 60 minutes. Naturally cool to room temperature. The solid charcoal grain organic matter content that makes is 30.5%, and pH is 7.7, and total nutrient (N+P 2 o 5 +K 2 O) 3.6%, the maximum water retention capacity is 57%, and the heavy metal content does not exceed the standard, which can obviously improve the permeability and water retention capacity of the soil, and can provide certain nutrients.

Embodiment 3

[0026] Take a certain amount of Dianchi Lake sediment that has been granulated and dried, put it into a carbonization furnace, pass in steam to displace the air in the furnace and continue to pass in protective gas, heat up to 500°C at a heating rate of 20°C / min, and carbonize for 60 minutes. Naturally cool to room temperature. The solid charcoal particle organic matter content that makes is 29%, and pH is 7.6, and total nutrient (N+P 2 o 5 +K 2 O) 3.6%, the maximum water retention capacity is 58%, and the heavy metal content does not exceed the standard, which can obviously improve the permeability and water retention capacity of the soil, and can provide certain nutrients.

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Abstract

The invention discloses a method for preparing a soil conditioner by carrying out carbonization treatment on lake substrate sludge. The method comprises the following concrete steps: (1) taking lake substrate sludge, dehydrating until the moisture content of the lake substrate sludge is about 35 percent, entering a pelleting device to prepare substrate sludge granules with the diameter of 2-3 mm, placing the substrate sludge granules in a oven, and drying until the moisture content of the substrate sludge granules is 10-15 percent; (2) placing the dried substrate sludge granules into a carbonization furnace, and introducing vapor to substitute air in the furnace and continuously introducing vapor as protective gas; and (3) raising the temperature to 400-500 DEG C with the heating rate of 10-20 DEG C / min to carry out carbonization reaction, standing for 50-70 min, and naturally cooling to the room temperature. By adopting the invention, carbonization treatment is carried out on the lake substrate sludge, the soil conditioner with good performance can be prepared, and an approach for the reclamation, harmlessness and reduction utilization of the lake substrate sludge is provided. Harmful microbes such as various pathogenic bacterium, virus and the like in the substrate sludge can be effectively eliminated in the high-temperature process of carbonization, thereby potential hazard to the human health is eliminated. In addition, in the carbonization process, heavy metals are inactivated, thereby the pollution caused by the heavy metals is effectively controlled.

Description

technical field [0001] The invention relates to resource utilization of lake bottom mud, in particular to a method for preparing a soil conditioner by carbonizing lake bottom mud. Background technique [0002] Due to the long-term application of chemical fertilizers in our country, a lot of land has been compacted, and a large amount of nutrients contained in the soil have been lost, so that the land has become increasingly barren, and the yield has dropped sharply. In order to maintain the yield, we have to use more chemical fertilizers. The further deterioration of the soil conditions has resulted in the production of products with excessive toxic and harmful elements. [0003] Lake sediment is usually a mixture of clay, silt, organic matter and various minerals deposited on the bottom of the water body after long-term physical, chemical and biological actions and water transport. The sediment with a thickness of 0 to 15 cm on the surface is called surface sediment, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/00C10B53/00C09K101/00
Inventor 任治忠杨月红李迎赵健蓉刘梦雪付廷栋舒敦涛
Owner KUNMING UNIV OF SCI & TECH
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