Method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization

A technology of capacitive deionization and aeration oxidation, which is applied in oxidation water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. and other problems to achieve the effect of reducing the load

Inactive Publication Date: 2012-04-18
DALIAN UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, during the development of coalbed methane, in order to release the methane gas adsorbed and stored in the coalbed, it is necessary to reduce the static pressure of the coalbed methane. The amount of water is large, and it has high salinity, high salinity, and a large amount of suspended solids. If the coalbed methane production water is directly discharged into the ground, rivers or irrigated farmland, it will have a certain impact on the water environment, ecological environment, and atmospheric environment.

Method used

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  • Method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization
  • Method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization
  • Method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, desalination treatment is carried out by pure brine, the concentration of brine is 1000mg / L, the volume of water sample is 500mL, and two carbon electrodes with an area of ​​300mm×500mm are used for desalination treatment. The voltage across the electrodes was 2.0V, and after 30min of electro-adsorption treatment, the final brine concentration was 126mg / L.

Embodiment 2

[0025] In this example, the electrosorption test is carried out on heavy metal copper ions. The concentration of copper ions is 200mg / L, the volume of water sample is 500mL, and two carbon electrodes with an area of ​​300mm×500mm are used for desalination treatment. The voltage across the electrodes was 2.0V, and after 30min of electro-adsorption treatment, the final brine concentration was 0.1mg / L.

Embodiment 3

[0027] In this example, the water produced by coalbed methane is simulated by self-made, and the water quality conditions are shown in Table 1. See the processing flow chart figure 1 , mainly includes three processing steps: using air to perform microporous air aeration treatment on the simulated water quality, the water sample volume is 110mL, the aeration flow rate is 20mL / min, and the aeration time is 1h; then it is filtered through quartz sand media; finally, the The filtered produced water passes through the capacitive deionization module with an operating voltage of 1.6V and a circulation flow rate of 5mL / min. The total conductivity efflux curves of different ions are shown in figure 2 shown. The water quality analysis at the two different treatment stages is shown in Table 2. It can be seen that this process can realize the safe discharge of coalbed methane mining drainage with high iron content.

[0028] Table 1 Influent water quality (unit: mg / L)

[0029] ...

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Abstract

The invention discloses a method for treating coal bed gas produced water by combining pre-oxidation aerated oxidation with capacitive deionization, belonging to the technical field of water treatment. The method comprises the following steps of: oxidizing Fe<2+> and Mn<2+> contained in coal bed gas produced water based on oxygen supply aerated oxidation to form flocculent precipitates of Fe(OH3) and MnO2, and filtering to effectively lower the iron and manganese content of raw water and lower the load for subsequent treatment simultaneously; and treating the pre-oxidized coal bed gas produced water with a capacitive deionization technology to further remove other ions. The technical method can be effectively applied to coal bed gas produced water containing high-concentration iron and manganese ions, and can be applied to the fields of desalination of brackish water and seawater, removal of heavy metal ions and the like simultaneously.

Description

technical field [0001] The invention relates to a method for treating coalbed methane produced water by combining pre-oxygen aeration oxidation and capacitive deionization, and belongs to the technical field of water treatment. Background technique [0002] Coalbed methane, also known as gas, is a kind of unconventional natural gas that occurs in coal seams. It is a new type of clean energy, and its exploitation and utilization have been paid more and more attention. my country is a country that uses coal as its main energy source, so coal-bed methane resources are very rich. According to the national coal-bed methane resource evaluation report completed by China United Corporation in 2005, the geological resources of coal-bed methane in my country with a buried depth of less than 2,000 meters are about 36 trillion yuan. Cubic meters, so the development and utilization of coalbed methane, a new clean energy, can improve my country's energy structure to a certain extent and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/72
Inventor 邱介山王刚董强钱冰清
Owner DALIAN UNIV OF TECH
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