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Thermal-desorption sewage treatment system and method for organic contaminated soil

A sewage treatment system and a technology for organic pollution, applied in the field of soil remediation, can solve the problems of incomplete removal, poor cooling effect, complicated and cumbersome treatment process, etc., and achieve the effect of eliminating organic matter, reducing harm, and having a simple structure.

Pending Publication Date: 2019-03-08
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention with the publication number CN205420003U discloses a thermal desorption spray tower circulating spray wastewater treatment, cooling and recycling system. This system can simply and economically treat high-temperature wastewater, but the pollutants in the reuse water are not Completely removed, after continuous circulation, the cooling effect of circulating water on thermal desorption tail gas will become worse, and the pollutants in the water will also enter the tail gas again; the invention with the publication number of CN104906876A discloses a method for purifying organic polluted soil thermal desorption tail gas The method and device, wherein the spray liquid is divided into three layers after precipitation treatment, the middle liquid is directly used as the spray liquid after being filtered, and the upper and lower liquids pass through the chemical oxidation reaction tank to remove most of the organic pollutants in the wastewater, and then Remove residual organic matter by pressure filtration, filtration, activated carbon adsorption, etc.
This method settles the spray liquid and divides it into three types of treatment. The treatment process is complicated and cumbersome, and the pollutants in the middle liquid are not removed, which will affect the use effect of the spray liquid.
Moreover, heavy metal pollutants in thermal desorption have not been effectively removed
[0004] The wide variety of polluted sites and the variety of pollutants greatly limit the practical applicability of general organic polluted soil thermal desorption sewage treatment systems and methods. Therefore, it is necessary to design an economical, efficient and energy-saving thermal desorption of organic polluted soil Attached sewage treatment system and method to overcome the above problems

Method used

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  • Thermal-desorption sewage treatment system and method for organic contaminated soil

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Embodiment 1

[0031] Such as figure 1 As shown, this embodiment provides a thermal desorption sewage treatment system for organic polluted soil, including a sludge tank, a regulating tank, a coagulation sedimentation tank, a Fenton sedimentation tank, a deep oxidation tower, and a filter device that are sequentially connected along the sewage flow direction and clear water pool; along the sewage flow direction, the coagulation sedimentation tank is divided into a coagulation reaction zone and a coagulation sedimentation zone successively, and the Fenton sedimentation tank is divided into a Fenton reaction zone, a Fenton sedimentation zone and a buffer zone successively; The coagulation sedimentation zone is communicated with the Fenton reaction zone through the outlet weir, the Fenton sedimentation zone is communicated with the buffer zone through the outlet weir, the mud outlet of the coagulation sedimentation zone and the Fenton precipitation The sludge outlets in the zone are all connect...

Embodiment 2

[0043] Such as figure 1 As shown, the present embodiment provides a method for treating organic polluted soil thermal desorption sewage, comprising the following steps:

[0044] 1) Collect the thermal desorption sewage into the regulating tank for homogeneous treatment to reduce the load of subsequent treatment equipment;

[0045] 2) The sewage treated in step 1) is lifted by the pump to the coagulation reaction area of ​​the coagulation sedimentation tank, and alkali is added to the coagulation reaction area to adjust the pH of the sewage to 8-9, and then the heavy metal scavenger is added Capture heavy metal ions, and finally add coagulants (PAC and PAM) for coagulation treatment, so that the suspended particles in the wastewater will be destabilized, and the colloidal particles will coagulate with each other to increase the size of the particles, forming flocs and alum flowers, which will form The floc enters the coagulation sedimentation area of ​​the coagulation sediment...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a thermal-desorption sewage treatment system for organic contaminated soil. The system comprises a sludgetank as well as a regulating tank, a coagulating sedimentation tank, a Fenton sedimentation tank, a deep oxidation tower, a filter device and a clean water tank which are sequentially connected in thecirculating direction of the sewage; the inside of the coagulating sedimentation tank is sequentially divided into a coagulating reaction area and a coagulating sedimentation area, and the inside ofthe Fenton sedimentation tank is sequentially divided into a Fenton reaction area, a Fenton sedimentation area and a buffer area; a sludge outlet of the coagulating sedimentation area and a sludge outlet of the Fenton sedimentation area are communicated with the sludge tank. The invention further provides a thermal-desorption sewage treatment method for the organic contaminated soil. After being subjected to homogenizing and averaging treatment, thermal-desorption sewage is subjected to coagulation, Fenton reaction and deep oxidation treatment in sequence, filtered water enters the clean watertank for recovery or is discharged up to standard, and the sludge is separated by filter pressing. According to the thermal-desorption sewage treatment system and method for the organic contaminatedsoil, various kinds of organic matter can be effectively treated and no secondary pollution is produced.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a thermal desorption sewage treatment system and method for organic polluted soil. Background technique [0002] Thermal desorption technology is to heat the polluted soil above the boiling point of the target pollutant, so that the target pollutant can be volatilized from the soil. During the thermal desorption process, the target pollutants undergo a series of actions such as evaporation, distillation, boiling, oxidation, and pyrolysis, and are finally completely eliminated or concentrated and collected in subsequent treatment facilities. [0003] Thermal desorption technology is a non-combustion technology widely used in the remediation of organic polluted soil. It has the advantages of multiple pollutant treatment categories, flexible equipment movement, and reusable soil remediation. The high-temperature flue gas generated during thermal desorption oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/121B09C1/06C02F101/20C02F101/30C02F103/06
CPCC02F9/00C02F11/121B09C1/06C02F2101/30C02F2101/20C02F2103/06C02F1/001C02F1/5236C02F1/5281C02F1/72C02F1/66C02F1/56C02F1/62C02F1/78C02F1/722
Inventor 石德升王文超赵颖田靓肖国俊别雪祥
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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