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Enhanced in-situ chemical oxidation repairing technology of soil and underground water

An in-situ chemical oxidation and groundwater technology, applied in the restoration of polluted soil, chemical instruments and methods, water pollutants, etc. Area and other issues, to achieve the effect of simple and flexible design and operation, low-cost repair, and less secondary pollution

Inactive Publication Date: 2018-01-09
中海石油环保服务(天津)有限公司
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  • Application Information

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Problems solved by technology

Patent CN104438315A discloses an in-situ chemical oxidation injection equipment for repairing soil and groundwater. The device includes a chemical preparation system, a chemical injection system and a monitoring system. The chemical injection system injects the oxidant prepared by the chemical preparation system into the injection well through an air compressor. , the monitoring system monitors soil and groundwater remediation, but this device cannot increase the remediation area of ​​a single well to reduce remediation costs
Patent CN103920703A discloses an advanced redox treatment system and method for remediating polluted soil. The method adopts redox and biodegradation combined with enhanced remediation technology. First, the contaminated soil is detected, and a pollution treatment system is established according to the detection results, and advanced Redox treatment, the treated soil is biodegradable, but in this method, the contact area between the agent and the pollutant cannot be expanded to improve the utilization rate of the agent

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  • Enhanced in-situ chemical oxidation repairing technology of soil and underground water
  • Enhanced in-situ chemical oxidation repairing technology of soil and underground water

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A soil and groundwater enhanced in-situ chemical oxidation restoration process is carried out according to the following steps:

[0030] 1) Contaminated site measurement: According to the site survey technology, the depth and area of ​​pollution, soil physical and chemical properties, and the type and concentration of pollutants are known; the depth and location of horizontal injection wells and the type and ratio of oxidizing agents are determined based on the above materials.

[0031] 2) Build repair equipment at the repair site: Build repair equipment according to the depth and position of the horizontal injection well determined in step 1), the repair equipment includes: dosing pump 1, gas injection pump 2, horizontal injection well 3, horizontal Extraction well 4, gas-liquid separator 5, extraction pump 6 and plasma purifier 7; the drug outlet of the dosing pump and the gas outlet of the gas injection pump are connected to the drug inlet of the horizontal drug injec...

Embodiment 2

[0043] Taking an industrial site as an example, it can be divided into four layers according to the age of formation: miscellaneous filling layer, silty clay layer, silt layer and silty clay layer. The site pollutants are mainly petroleum hydrocarbons, mainly concentrated in the upper silty clay layer and silt layer, and the pollution depth is 3.5m-9.5m.

[0044] First, build horizontal drug injection wells and horizontal extraction wells in and above the polluted area. The chemical reacts with the pollutants; after all the oxidizing agents are added, the air injection pump is turned on, and the air is injected into the contaminated part through the air injection pump to provide the oxygen required for the reaction; The agent is injected into the contaminated site to biodegrade the residual pollutants and reactants.

[0045] This embodiment includes 3 processing points, numbered respectively: point 1, point 2, and point 3. The concentration of total petroleum hydrocarbons (<...

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Abstract

The invention relates to an enhanced in-situ chemical oxidation repairing technology of soil and underground water. The enhanced in-situ chemical oxidation repairing technology comprises the steps offield measurement, repairing equipment construction, oxidation reagent injection, air injection, biopreparate injection, gas-liquid separation and tail gas treatment. Oxidation reagents are conveyed to a polluted part by using a dosing pump through a horizontal reagent injection well, reaction gas is conveyed to a gas-liquid separation device by an extraction pump through a horizontal extraction well, and separated gas is removed through a plasma purifier; and after reagent injection is conducted, gas injection is conducted on a horizontal gas injection well through a gas injection pump, and after a certain period, biopreparate is injected into the polluted part through the dosing pump. According to the enhanced in-situ chemical oxidation repairing technology of the soil and the underground water, the removing rate to the total petroleum hydrocarbon in a polluted site with the concentration of the total petroleum hydrocarbon (less than C16) being high can reach over 90%, the single well repairing area is large, the application range is wide, and secondary pollution is low.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated sites, in particular to a soil and groundwater enhanced in-situ chemical oxidation remediation process. Background technique [0002] Chemical oxidation technology is a remediation technology that uses strong oxidants to destroy or degrade organic pollutants in groundwater, sediment and soil to form environmentally harmless compounds. Organic pollutants that can be effectively treated include: chlorinated solvents such as volatile organic compounds such as dichlorethylene (DCE), trichlorethylene (TCE), tetrachlorethylene (PCE), and benzene, toluene, ethylbenzene and xylene ( BTEX) and other benzene series; semi-volatile organic chemicals, such as pesticides, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), etc. The treatment effect on compounds containing unsaturated carbon bonds (such as paraffin, chlorinated aromatic compounds) is obvious and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C02F9/14B01D53/32C02F101/30
Inventor 谷广锋曹兴涛刘涛王新新郭兵杨庭白鹤马蒸钊赵广宇谢江浩肖成磊刘铭辉
Owner 中海石油环保服务(天津)有限公司
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