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Treatment method and device for high-salt wastewater in oil and gas field

A waste water treatment, high-salt technology, applied in water/sewage treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve the problem of zero discharge of high-salt waste water and inability to effectively degrade organic matter and metals Ions and other problems, to achieve the effect of improving the utilization rate and good oxidation effect

Pending Publication Date: 2019-06-07
BEIJING WEICHUANGLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane separation method is a physical method that can effectively concentrate organic matter and metal ion solutions in wastewater, but cannot effectively degrade and precipitate organic matter and metal ions in water, and cannot achieve the goal of zero discharge during the treatment of high-salt wastewater

Method used

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  • Treatment method and device for high-salt wastewater in oil and gas field
  • Treatment method and device for high-salt wastewater in oil and gas field
  • Treatment method and device for high-salt wastewater in oil and gas field

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Such as figure 1 Shown is the first embodiment of the method for treating high-salt wastewater from oil and gas fields of the present invention. In this embodiment, the pH value of the high-salt wastewater from oil and gas fields is 7 to 10, the average COD concentration is 1800 mg / L, and the conductivity is 5000 to 1000 mg / L. 6000μS / cm.

[0057] Treatment methods for high-salt wastewater in oil and gas fields, including:

[0058] (S1) Flocculation and sedimentation: homogenize the wastewater, add flocculants, and convert the suspended solids and some macromolecular organic matter in the wastewater into sediments;

[0059] After the oil and gas field high-salt wastewater is mixed evenly, add flocculant, add 150mg / L polyferric sulfate to the evenly mixed wastewater, adjust the pH value, then stir and add 15mg / L PAM aqueous solution, after standing for precipitation, Suspended solids and some macromolecular organic matter in wastewater are converted into sediment and re...

Embodiment 2

[0071] The steps of the second embodiment of the oil and gas field high-salt wastewater treatment method of the present invention are the same as the steps of Example 1, and the difference with Example 1 is:

[0072] In this embodiment, the pH value of the highly saline wastewater from oil and gas fields is 5-9, the average COD concentration is 1000 mg / L, and the conductivity is 7000-10000 μS / cm.

[0073] In step (S1) flocculation and precipitation, the addition process of flocculant is: add the polyferric sulfate of 100mg / L in the mixed waste water, adjust pH value, then stir and add the PAM of 10mg / L, after static precipitation, waste water Suspended solids and some macromolecular organic matter are converted into sediment and removed from wastewater.

[0074] In step (S2) micro-electrolytic ozonation, the ozone gas flow rate is 3 L / min.

[0075] In the step (S4) of solid-liquid separation, the solid-liquid separation is carried out by inclined plate sedimentation.

[0076...

Embodiment 3

[0078] Such as figure 2 In the example shown, the micro-electrolysis ozone reaction integrated device of the oil and gas field high-salt wastewater treatment equipment of the present invention includes: a tank-shaped micro-electrolysis ozone reactor 1, and an iron-carbon micro-electrolysis packing layer is arranged in the micro-electrolysis ozone reactor 1 6; The iron-carbon micro-electrolysis filler layer 6 includes several strings of fillers 61 suspended above the micro-electrolysis ozone reactor 1; each string of fillers 61 is a plurality of filler units connected one by one by flexible materials 7. In this example, the filler unit is a sintered spherical filler with a diameter of 1.5 to 2.0 cm. The flexible material 7 is a string. Some string packing strings 61 have constituted the iron-carbon micro-electrolysis packing layer 6 in this example, hang on the upper end of micro-electrolysis ozone reactor 1 by string, in this example, the upper end of micro-electrolysis ozone...

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Abstract

The invention discloses a treatment method and device for high-salt wastewater in an oil and gas field. The method comprises the following steps: step (1) performing flocculation precipitation; step (2) performing micro-electrolysis ozone oxidation: adjusting the pH value of the wastewater treated by flocculation precipitation in the step (1) to 5.0-8.0, and performing micro-electrolytic ozone oxidation treatment on the wastewater to remove COD in the wastewater; step (3) performing aeration softening: adding sodium hydroxide and sodium carbonate into the wastewater treated by micro-electrolysis ozone oxidation treatment in the step (2), and performing aeration to make the sodium hydroxide and the sodium carbonate reacted with precipitable metal ions in the wastewater to form a precipitate; step (4) performing solid-liquid separation: separating the precipitate obtained by aeration softening treatment in the step (3) from the wastewater; and step (5) performing bipolar membrane electrodialysis: performing bipolar membrane electrodialysis treatment on the wastewater treated by solid-liquid separation treatment in the step (4) to obtain an acid solution, an alkali solution and an initial desalinated water. The method provided by the invention has a simple process, saves costs, can effectively remove COD and salts in the wastewater, and has a good purification effect on the wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method and equipment for treating high-salt wastewater generated in oil and gas fields. Background technique [0002] Oil and natural gas are the most commonly used energy sources in modern society. In the process of oilfield development, various substances need to be added, resulting in wastewater with complex components and high salt content. These wastewaters come from a wide range of sources, generate a large amount, and a large amount of salt in the water will have a great impact on the environment. It is very difficult to treat and transport. Therefore, how to effectively treat these high-salt wastewater is an urgent problem to be solved. [0003] The goal of high-salt wastewater treatment technology is to achieve zero discharge of wastewater, requiring the salt in wastewater to be recovered or utilized in the form of solid or liquid. Therefore, the use of appropriat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/78
Inventor 黄尧奇赵忠敏
Owner BEIJING WEICHUANGLI TECH CO LTD