Soil remediation method

A soil remediation and soil technology, applied in the field of soil remediation, can solve problems such as low efficiency, achieve the effects of low cost, simple and easy remediation process, and solve the problem of soil pollution

Active Publication Date: 2012-07-04
广州市金龙峰环保设备工程股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Current methods of soil remediation appear to ...

Method used

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  • Soil remediation method

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Embodiment 1

[0029] Such as figure 1 Shown, a kind of soil remediation method, comprises the following steps:

[0030] 1) The primary screw conveyor transports the soil to be repaired (humidity <25%) to the vibrating screen for screening, and the secondary screw conveyor transports the screened soil (particle size <14mm) to the rotary kiln of the thermal desorption furnace (Yixing Hua Produced by Rui Incinerator Technology Development Co., Ltd., model: HR-X), the temperature of the material in the rotary kiln of the thermal desorption furnace is kept in the range of 450°C -800°C, and the pressure in the rotary kiln of the thermal desorption furnace is -50Pa to -60Pa ;

[0031] 2) The three-stage screw conveyor transports the thermally decomposed soil to the crusher for crushing at a conveying speed of 100kg / h, and the crushed soil can be used as commercial land soil;

[0032] 3) The exhaust gas from the rotary kiln of thermal desorption furnace is 620m 3 The flow rate of / h passes throu...

Embodiment 2

[0038] Such as figure 1 Shown, a kind of soil remediation method, comprises the following steps:

[0039] 1) The primary screw conveyor transports the soil to be repaired (humidity <25%) to the vibrating screen for screening, and the secondary screw conveyor transports the screened soil (particle size <14mm) to the rotary kiln of the thermal desorption furnace (Yixing Hua Produced by Rui Incinerator Technology Development Co., Ltd., model: HR-X), the temperature of the material in the rotary kiln of the thermal desorption furnace is kept in the range of 450°C to 800°C, and the pressure in the rotary kiln of the thermal desorption furnace is -80Pa to -100Pa ;

[0040] 2) The three-stage screw conveyor transports the roasted soil to the crusher for crushing at a conveying speed of 80kg / h, and the crushed soil can be used as commercial land soil;

[0041] 3) The waste gas from the rotary kiln of thermal desorption furnace is 640m 3 The flow rate of / h passes through the first ...

Embodiment 3

[0046] Such as figure 1 Shown, a kind of soil remediation method, comprises the following steps:

[0047] 1) The primary screw conveyor transports the soil to be repaired (humidity <25%) to the vibrating screen for screening, and the secondary screw conveyor transports the screened soil (particle size <14mm) to the rotary kiln of the thermal desorption furnace (Yixing Hua Produced by Rui Incinerator Technology Development Co., Ltd., model: HR-X), the temperature of the material in the rotary kiln of the thermal desorption furnace is kept in the range of 450 ° C -800 ° C, and the pressure in the rotary kiln of the thermal desorption furnace is -50Pa to -60Pa ;

[0048] 2) The three-stage screw conveyor transports the roasted soil to the crusher for crushing at a conveying speed of 120kg / h, and the crushed soil can be used as commercial land soil;

[0049] 3) The waste gas from the rotary kiln is 660m 3 The flow rate of / h passes through the first water condenser to cool down...

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Abstract

The invention discloses a soil remediation method, comprising the following steps: (1) conveying to-be-remedied soil to a vibrating screen via a first-level spiral conveyer, conveying the screened soil to a rotary kiln of a thermal desorption furnace via a second-level spiral conveyer to heat and desorb the soil; (2) conveying the roasted soil to a crusher via a third-level spiral conveyer to crush; (3) decreasing the temperature of waste gas from the rotary kiln of the thermal desorption furnace to 280-320 DEG C through a first water condenser; (4) separating dust particles and liquid mercury from the waste gas passing through the first water condenser in a mercury separator; and (5) burning the waste gas from the mercury separator in a secondary combustor, decreasing the temperature of the waste gas to 150-200 DEG C via a gas condenser and a second water condenser, dedusting the gas via a bag-type dust remover and discharging the dedusted gas through a draught fan. The soil remediation method disclosed by the invention has the advantages that: the soil pollution problem can be well solved; the remedied soil can be directly used; in addition, the remediation process is simple andpracticable, and the cost is low.

Description

technical field [0001] The invention relates to a soil restoration method. Background technique [0002] As a basic problem that restricts the sustainable development of human society, soil pollution is attracting more and more attention. The types of pollutants in the soil are mainly classified according to their nature: [0003] 1) Organic substances, among which chemical pesticides, especially organochlorine and organophosphorus pesticides, are relatively large in quantity and relatively important; [0004] 2) Nitrogen and phosphorus chemical fertilizers; [0005] 3) Heavy metals such as chromium, copper, zinc, lead, mercury, cadmium, arsenic; [0006] 4) Radioactive elements, especially the long-lived radionuclide 137Cs; [0007] 5) Enterobacteriaceae, Bacillus anthracis, Bacillus tetanus, intestinal parasites, Vibrio cholerae, Mycobacterium tuberculosis and other harmful microorganisms. [0008] Soil pollution has the following characteristics: [0009] 1) Conceal...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 潘永刚石云峰尹翠琴胡继波汤克敏林志坚
Owner 广州市金龙峰环保设备工程股份有限公司
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