Polluted site underground water processing-soil ex-situ leaching restoration integral method

A groundwater and soil technology, applied in the field of polluted site remediation, can solve the problems of secondary pollution, activated carbon is not easy to regenerate or reuse, and the saturated adsorption capacity is small, so as to save costs and realize the effect of waste reuse.

Inactive Publication Date: 2013-08-07
ZHEJIANG TAOHUAYUAN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

Although activated carbon has good performance in adsorbing organic pollutants, its saturated adsorption capacity is small and waste activated carbon is not easy to regenerate or reuse, resulting in high application cost and easy to cause secondary pollution

Method used

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  • Polluted site underground water processing-soil ex-situ leaching restoration integral method

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Embodiment Construction

[0023] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] In this embodiment, the groundwater treatment-soil ectopic leaching and restoration integrated method of the polluted site, the steps are as follows:

[0025] (1) The extracted groundwater enters the organic bentonite filled column, and the removal rate of organic pollutants is more than 90%;

[0026] (2) The purified groundwater is discharged into the storage tank for subsequent soil washing (replenishment of insufficient water with tap water);

[0027] These two steps are the groundwater treatment process (in the dotted line box in the accompanying drawing 1).

[0028] (3) Add the water and surfactant from the water storage tank into the dosing tank to make a 0.1% to 2% eluent;

[0029] (4) Contaminated soil is initially sieved by a multi-stage wet vibrating sieve. Stones (>5mm) are removed by the first-stage sieve and collected; coarse sand...

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Abstract

The invention discloses a polluted site underground water processing-soil ex-situ leaching restoration integral method. The method comprises the steps that: extracted underground water is purified by using organic bentonite, and is discharged into a water storage tank and is used in a soil leaching process; with a multilevel wet vibration sieve, stones and coarse sand are separated from soil; a soil suspension liquid obtained by sieving enters a hydrocyclone; fine particles smaller than 0.05mm are processed and discharged into a frame filter press, and pollutants are removed with a thermal desorption method; particles larger than 0.05mm and the coarse sand are delivered into a leaching tank; a leaching liquid is a surfactant solution; stirring and ultrasonic processing are carried out, and standing sedimentation is carried out; upper-layer water phase is subjected to filtering and organic bentonite purification, and is discharged into a dispensing tank; lower-layer soil is delivered into a washing tank; stirring and ultrasonic processing are carried out, and standing sedimentation is carried out; soil phase is discharged into the frame filter press; and the soil reaches a standard and can be backfilled. With the method, underground water and soil synchronous restoration and leaching liquid recycling are realized. The method is easy to realize, and can be widely applied. The method can be used in polluted site soil and underground water restoration projects.

Description

technical field [0001] The invention belongs to the field of remediation of polluted sites, in particular to soil and groundwater remediation of polluted sites. Background technique [0002] With the development of the economy and the acceleration of urban construction, the nature of the site changes more frequently. Many industrial enterprises have moved out of urban areas one after another, and the original industrial land has gradually been developed into residential land, school land or public construction land. However, years of industrial and business activities have resulted in severe pollution of the plant's soil and groundwater, which may endanger the health of residents. Therefore, the task of remediation and governance of polluted industrial and enterprise sites is very urgent. [0003] At present, soil remediation methods at home and abroad mainly include physical remediation, chemical remediation and biological remediation. However, some methods have disadvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 钟宇驰吴振华
Owner ZHEJIANG TAOHUAYUAN ENVIRONMENTAL PROTECTION TECH
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