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Acid fracturing waste liquid induction electro-Fenton treatment method and device

A technology of acid fracturing and treatment equipment, which is applied in the fields of mining wastewater treatment, chemical instruments and methods, and special compound water treatment, etc. It can solve the problems of OH utilization efficiency decrease, current efficiency decrease, pH value fluctuation, etc., and achieve removal efficiency Improvement, optimization of electrode structure, and suitable reaction conditions

Active Publication Date: 2021-06-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems in the prior art of this field, such as obvious pH value fluctuations, decreased OH utilization efficiency, and decreased current efficiency due to early dosing of Fe2+, the method provided by the present invention adopts an improved The induction electric Fenton can realize the stable dosing of Fe2+, and at the same time, the pH value in the reaction process is always under the optimal pH condition, which effectively improves the removal efficiency of refractory pollutants (acidification pressure The removal rate of organic pollutants in cracking waste liquid is stable above 80%), and the current efficiency is significantly improved compared with that before improvement

Method used

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  • Acid fracturing waste liquid induction electro-Fenton treatment method and device
  • Acid fracturing waste liquid induction electro-Fenton treatment method and device
  • Acid fracturing waste liquid induction electro-Fenton treatment method and device

Examples

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Embodiment 1

[0071] This embodiment provides an induction electric Fenton treatment device for acidified fracturing waste fluid, wherein the structural schematic diagram of the device is as follows figure 1 shown, from figure 1 It can be seen that it includes:

[0072] Induction electric Fenton oxidation tank 1 and sedimentation separation tank 2, described induction electric Fenton oxidation tank is connected with described sedimentation separation tank by pipeline;

[0073] The anode of the induction electric Fenton oxidation cell is meshed RuO 2 / Ti electrode, the negative electrode is the activated carbon fiber felt bound on the surface of the titanium mesh; an induction iron electrode is arranged between the anode and the cathode, and the induction iron electrode is a back shape (such as Figure 2c Shown) induction iron electrode;

[0074] The inside of the induction electric Fenton oxidation tank is also provided with an aeration system and a stirring device;

[0075] In this e...

Embodiment 2

[0082] This embodiment provides an induction electric Fenton treatment device for acidified fracturing waste liquid, wherein the difference between the device and the electric induction Fenton treatment device for acidified fracturing waste liquid provided in Example 1 is that the induction iron The electrode is a zigzag cross-sectional shape (such as image 3 Shown) the induction iron electrode.

Embodiment 3

[0084] This embodiment provides an induction electric Fenton treatment device for acidified fracturing waste liquid, wherein the difference between the device and the electric induction Fenton treatment device for acidified fracturing waste liquid provided in Example 1 is that the induction iron The electrode is a spiral cross-sectional shape (such as Figure 4 Shown) the induction iron electrode.

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Abstract

The invention provides an acid fracturing waste liquid induction electro-Fenton treatment method and device. The device comprises an induction electro-Fenton oxidation pond and a settling separation pond, and the induction electro-Fenton oxidation pond is communicated with the settling separation pond through a pipeline; the cathode of the induction electro-Fenton oxidation pond is an activated carbon fiber felt bound on the surface of a titanium mesh; an induction iron electrode is arranged between the anode and the cathode of the induction electro-Fenton oxidation pond; and an aeration system is also arranged in the induction electro-Fenton oxidation pond. The improved induction electro-Fenton is adopted, stable feeding of Fe<2+> is achieved, meanwhile, the pH value in the reaction process is controlled to be under the optimal pH condition all the time, the removal efficiency of refractory pollutants is effectively improved (the removal rate of organic pollutants in the acid fracturing waste liquid stably reaches 80% or above), and the current efficiency is obviously improved compared with that before improvement.

Description

technical field [0001] The invention relates to an induction electric Fenton treatment method and device for acidified fracturing waste liquid, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] Shale is an ultra-low permeability reservoir, and all reservoirs must be fractured before they can be put into production. In the initial stage of fracturing of each shale gas well or in the process of recovering production capacity of some low-production wells, it is necessary to acidify the reservoir, inject a certain amount of high-acid fracturing fluid, and return it to the ground in the later stage. Acidified fracturing waste fluid has the characteristics of high acidity, high stability, high organic pollution load and high salinity, and is highly corrosive. It will acidify the soil after being discharged into the soil, and it will cause serious damage if it is directly discharged into the water body. water pollution. Therefore...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F103/10
CPCC02F1/467C02F2305/026C02F2103/10
Inventor 张晓飞罗臻杨雪莹王毅霖张华刘译阳李婷
Owner BC P INC CHINA NAT PETROLEUM CORP
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