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Ex-situ chemical restoration system of polluted soil

A polluted soil, chemical remediation technology, applied in the field of contaminated soil remediation, can solve the problems of damaged equipment, difficult to clean, easy clogging of high-pressure nozzles, etc.

Pending Publication Date: 2017-07-04
上海中耀环保实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, there are easy dead corners in the mixing box, and it is difficult to mix and stir evenly. The same set of dosing and stirring equipment is used to add various chemicals, and the mixing and stirring are easy to damage the equipment due to the interaction between the chemicals. Disadvantages such as easy clogging of high-pressure nozzles and difficulty in cleaning after clogging when the agent is suspended

Method used

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  • Ex-situ chemical restoration system of polluted soil
  • Ex-situ chemical restoration system of polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0131] A total petroleum hydrocarbon-contaminated soil is excavated and sent to the pretreatment device, screened and crushed by the ALLU screening and crushing bucket, and then sent to the storage warehouse by dump truck. The storage warehouse has a volume of 5m 3 , the contaminated soil in the storage bin is sent to the primary reactor through the double-screw unloader, the horizontal shaftless screw conveyor, and the inclined shaftless screw conveyor, and the hydrogen peroxide is added to the primary reactor through the first liquid chemical dosing device at the same time And mixed with the polluted soil by a double-helix mixer. The volume of the first-stage reactor is 3000L, and the amount of hydrogen peroxide added is 1% of the mass of the polluted soil. When the amount of polluted soil in the first-stage reactor reaches 2500L, it passes through the second unloading device once. It is unloaded into the secondary reactor, and citrate-complexed iron is added into the seconda...

Embodiment 2

[0133] A certain heavy metal contaminated soil is sent to the pretreatment device after being excavated, screened and crushed by the ALLU screening and crushing bucket, and then sent to the storage warehouse by a dump truck. The storage warehouse has a volume of 5m 3 , the contaminated soil in the storage bin is sent to the first-stage reactor through the double-screw unloader, the horizontal shaftless screw conveyor, and the inclined shaftless screw conveyor. Sodium sulfide solution, dosing bentonite through the first solid agent dosing device and mixing with the contaminated soil through a double-helix mixer, wherein the volume of the primary reactor is 4500L, the amount of sodium sulfide added is 4‰ of the quality of the polluted soil, and the amount of bentonite added It is one ten-thousandth of the quality of polluted soil. When the amount of polluted soil in the primary reactor reaches 3500L, it will be unloaded into the secondary reactor through the second unloading devi...

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Abstract

The invention provides an ex-situ chemical restoration system of polluted soil. The system is sequentially provided with a pretreatment device, a storage bin, a primary reactor, a secondary reactor and a maintenance device, a first conveying device used for conveying is arranged between the pretreatment device and the material inlet of the storage bin, a second conveying device used for conveying is arranged between the material outlet of the storage bin and the material inlet of the primary reactor, the material outlet of the primary reactor corresponds to the material inlet of the secondary reactor, and a third conveying device used for conveying is arranged between the material outlet of the secondary reactor and the maintenance device. The invention provides an ex-situ chemical restoration method of polluted soil. The ex-situ chemical restoration system of polluted soil allows a liquid or solid reagent to be quantitatively added, can continuously automatically run or intermediately run, can control the reaction time to guarantee the ex-situ chemical restoration effect of the polluted soil, realizes uniform mixing and stirring, is simple to operate, and can be widely applied to the ex-situ chemical restoration of the polluted soil.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to an ex-situ chemical remediation system for polluted soil, in particular to an ex-situ chemical remediation system for polluted soil and a remediation method thereof. Background technique [0002] Soil is one of the foundations of natural ecosystems and an important medium for human life and production. [0003] With the acceleration of urbanization and industrialization in our country, the upgrading of industrial structure and the adjustment of urban layout, a large number of industrial enterprises have moved out of urban areas. According to the "China Environmental Yearbook" (2002-2009), the number of closed and transferred enterprises in my country increased from 6,611 to 22,488 in 2001-2008, with a growth rate of 1,984 / a, and the total number reached more than 100,000. The relocation of industrial enterprises has left a large number of polluted sites, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 陈辉洋赵宁华唐秀华陈良才刘立文江闯魏宏斌
Owner 上海中耀环保实业有限公司
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