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System and method for treating polycyclic aromatic hydrocarbons polluted soil washing waste liquid

A waste liquid treatment system and a technology for polluting soil, which is applied in the field of washing waste liquid for washing polycyclic aromatic hydrocarbons polluted soil, can solve the problems of high cost, difficulty in recycling, excessive waste, etc., to overcome high cost and achieve zero discharge Effect

Active Publication Date: 2011-12-28
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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Problems solved by technology

[0006] The object of the present invention is to provide a system and method for treating waste liquid from washing polluted soil with polycyclic aromatic hydrocarbons. Technical problems of polycyclic aromatic hydrocarbons in liquid; and solve the problems of high cost, difficulty in recycling and waste caused by traditional methods

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  • System and method for treating polycyclic aromatic hydrocarbons polluted soil washing waste liquid
  • System and method for treating polycyclic aromatic hydrocarbons polluted soil washing waste liquid
  • System and method for treating polycyclic aromatic hydrocarbons polluted soil washing waste liquid

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Embodiment Construction

[0036] Examples see figure 1 , figure 2 As shown, a polycyclic aromatic hydrocarbon contaminated soil washing waste liquid treatment system is characterized in that it includes a sequentially connected pretreatment unit, coagulation sedimentation unit, ozone oxidation unit, effluent return supply unit, tail gas treatment unit and sludge disposal unit.

[0037] 1) Pretreatment unit: including regulating pool 2 and regulating pool lift pump 3, the water inlet of regulating pool 2 is connected with washing waste liquid inlet pipe 1, regulating pool 2 is equipped with regulating pool lifting pump 3, regulating pool lifting pump 3 The outlet pipe of the outlet is connected with the coagulation and sedimentation unit.

[0038] 2), coagulation and sedimentation unit: including cyclone reactor 5, sedimentation tank 7 and coagulant dosing device 6, the inlet pipe of cyclone reactor 5 is connected with coagulant dosing device 6, and the inlet of cyclone reactor 5 is The pipeline is...

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Abstract

The invention provides a treating system and method for waste liquid generated in washing of soil polluted by polycyclic aromatic hydrocarbons. The treating system comprises a pretreatment unit, a coagulation and sedimentation unit, an ozone oxidation unit, an effluent reusing unit, a tail gas treatment unit and a sludge disposal unit in sequential connection. A water distributing system used in the invention is of an umbrella shape. An aeration system employed in the invention is a microporous titanium aerator. An ozone generator utilized in the invention comprises an air compressor set, a lyophilizer, an oxygen making set and an ozone generating unit. According to the invention, waste liquid generated in washing of soil polluted by polycyclic aromatic hydrocarbons is the target of the invention; based on the characteristic that the waste liquid contains fine soil particles and a great amount of polycyclic aromatic hydrocarbons, coagulation and sedimentation as well as ozone oxidation are used as main treating techniques to rapidly and effectively remove polycyclic aromatic hydrocarbons in the waste liquid, and treated liquid can be recycled in a soil washing system, thereby realizing zero discharge of waste water in the technology of soil washing.

Description

technical field [0001] The invention belongs to the field of wastewater treatment in polluted soil washing and restoration technology, and in particular relates to a system and method for treating polycyclic aromatic hydrocarbons polluted soil washing waste liquid. Background technique [0002] Soil washing technology is a remediation technology for dealing with polycyclic aromatic hydrocarbon-contaminated soil. It is to mix the soil excavated from the polluted site with the eluent in the eluting reactor after pretreatment. With the assistance of external force, the polluted soil and the eluent have an effect. After most of the pollutants in the soil are transferred to the liquid phase, the washed soil is separated for backfill or advanced treatment. At the same time, the eluent is reused or reaches the standard after treatment. emission. Therefore, whether the eluent treatment is efficient or not has become a key factor to measure whether the soil washing technology can be...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C02F1/78C02F101/32
Inventor 姚珏君姜林樊艳玲钟茂生夏天翔王琪
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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