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Sonochemical-synergizing-electrochemical method for continuously treating oilfield wastewater

An oilfield sewage and ultrasonic technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as unsatisfactory, achieve high salinity, high iron content, Strong corrosion and scaling effect

Inactive Publication Date: 2011-05-25
广州金川环保设备有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Electrochemical oxidation of oilfield sewage is through ionization, electron action, electrode chemical reaction, electric buoyancy, and electric excitation resonance to make the suspended solids in the water form larger flocs to achieve the purpose of separation and purification. The purified water after treatment reduces the potential Poor, it improves the activation performance of the solution components, and kills various bacteria in the water in an extraordinary way, which slows down the occurrence of bacterial corrosion to a certain extent. In actual use, although there is a certain effect, but because the cathode slowly After fouling occurs, the electrolysis efficiency will gradually decrease, and even the gap between the cathode and anode will be completely blocked, and finally the machine must be shut down to remove the fouling, resulting in unsatisfactory results

Method used

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  • Sonochemical-synergizing-electrochemical method for continuously treating oilfield wastewater
  • Sonochemical-synergizing-electrochemical method for continuously treating oilfield wastewater
  • Sonochemical-synergizing-electrochemical method for continuously treating oilfield wastewater

Examples

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Embodiment example 1

[0035] Incoming water quality of an oilfield sewage station: PH = 6.2, dissolved oxygen = 1.036 mg / L, total iron: 48 mg / L, divalent sulfur: 2.9 mg / L, suspended solids = 53 mg / L, oil content: 156 mg / L, MF = 0, SRB = 10 3 n / ml, TGB = 10 3 n / ml, iron bacteria=10 3 n / ml, the average corrosion rate is 0.6902mm / a, the quality of incoming water shows high iron content, high salinity, and strong corrosion and scaling.

[0036] The oilfield sewage station is treated by sonochemical collaborative electrochemical oxidation method, and the treatment flow rate is 30m 3 / h, the ultrasonic frequency is 20HZ, 10 pairs of electrodes are connected in parallel, the distance between each pair of cathode and anode is 7mm, the anode material is titanium, the cathode material is platinum, the cathode plate thickness is 5mm, and the current density is 50A / h m 2 , in practice, the anode oxidizes the reducing substances in the sewage, such as Fe x (OH) m （3x-m）+And monomeric sulfur, sulfate ...

Embodiment example 2

[0039] For an oilfield sewage station, the incoming water quality indicators are: PH = 6.1, dissolved oxygen = 1.021 mg / L, total iron: 42 mg / L, divalent sulfur: 3.0 mg / L, suspended solids = 50 mg / L, oil content: 149 mg / L, MF = 0, SRB = 10 3 n / ml, TGB = 10 3 n / ml, iron bacteria=10 3 n / ml, the average corrosion rate is 0.661mm / a, and the quality of incoming water shows high iron content, high salinity, and strong corrosion and scaling.

[0040] The oilfield sewage station is treated by ultrasonic and electrochemical oxidation method, and the treatment flow rate is 100m 3 / h, the ultrasonic frequency is 200HZ, 12 pairs of electrodes are connected in parallel, the distance between each pair of cathode and anode is 9mm, the anode material is titanium, the cathode material is graphite, the cathode plate thickness is 30mm, and the current density is 1920A / h m 2 , in practice, the anode will reduce the reducing substances in the sewage, such as Fe x (OH) m （3x-m）+ And monomeric...

Embodiment example 3

[0043] For an oilfield sewage station, the incoming water quality indicators are: PH = 6.2, dissolved oxygen = 1.033 mg / L, total iron: 43 mg / L, divalent sulfur: 2.8mg / L, suspended solids = 55 mg / L, oil content: 150 mg / L, MF = 0, SRB = 10 3 n / ml, TGB = 10 3 n / ml, iron bacteria=10 3 n / ml, the average corrosion rate is 0.682mm / a, the quality of the incoming water shows high iron content, high salinity, and strong corrosion and scaling.

[0044] The oilfield sewage station is treated by the ultrasonic collaborative electrochemical oxidation method, and the treatment flow rate is 200m 3 / h, the ultrasonic frequency is 500HZ, 12 pairs of electrodes are connected in parallel, the distance between each pair of cathode and anode is 15mm, the anode material is graphite, the cathode material is graphite, the thickness of the anode and cathode plates is 30mm, and the current density is 5000A / m 2 , in practice, the anode will reduce the reducing substances in the sewage, such as Fe x ...

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Abstract

The invention relates to a sonochemical-synergizing-electrochemical method for continuously treating oilfield wastewater, belonging to the wastewater treatment field during oilfield exploitation. The method disclosed by the invention comprises the following steps: (1) oxidizing and degrading organic pollutants in the oilfield in a complex oxidizing method of synergizing sonochemistry and electrochemistry, wherein an ultrasonic frequency is 20-500 Hz, and an electric current density is 50-5000 A / m<2>; (2) cleaning scale on a synergistically and electrochemically oxidized cathode by using an ultrasonic cleaning method; and (3) coagulating, air-supporting or depositing, and filtering. By using the method for treating oilfield wastewater provided by the invention, medicaments are avoided from being added, medicament resistance of species in the water body is avoided, and phenomena such as discontinuous electrolytic process, low electrolytic efficiency due to the cathode scale caused by traditional electrochemical electrolysis and the like are avoided, thereby ensuring stable effluent quality and better purifying effect, so as to decrease water treatment costs.

Description

technical field [0001] The invention relates to a method for continuous treatment of oilfield sewage by ultrasonic chemistry and electrochemistry, belonging to the category of sewage treatment in oilfield exploitation and production. Background technique [0002] A large amount of oily sewage will be produced in the process of oilfield production and exploitation, especially in the process of oilfield exploitation. my country's oilfields have basically entered the secondary exploitation period, and the content of crude oil produced is less than 30%, or even lower, producing a large amount of complex components. The highly harmful sewage must be further treated before it can be re-injected into the underground layer. [0003] At present, the typical treatment processes and methods of oilfield sewage mainly include dosing coagulation, flocculation sedimentation, filtration; or dosing coagulation, air flotation, filtration and other methods. The above methods and processes have...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/36C02F1/72
Inventor 温镜新
Owner 广州金川环保设备有限公司
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