Method for treating oil field wastewater by electro-float process

An oilfield wastewater, electric flotation technology, applied in the direction of flotation water/sewage treatment, etc., can solve the problems that the dosage of chemicals affects the treatment effect, the water quality cannot meet the standard, etc., and achieves reduction requirements, lower treatment costs, and strong bactericidal effect. Effect

Inactive Publication Date: 2008-01-30
SHANGHAI ZHONGYOU ENTERPRISE GRP CO LTD
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AI Technical Summary

Problems solved by technology

At present, various oilfields need to add a variety of chemical agents in the water treatment process, and in the actual operation process on site, whether it is the screening of agents, dosage, dosing point, dosing method, cost control, on-site preparation, etc. Every link may affect the treatment effect, so that the water quality cannot meet the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The present invention will be further described in detail below through examples.

[0011] The oilfield produced water with an oil content of 53.90mg / L was used for the test. The specific flow direction of the oilfield wastewater: the oilfield wastewater first enters the water distribution area from the water inlet pipe, then turns over the baffle and enters the sloping plate, so that the oily sewage can be quickly separated on the sloping plate. Part of the oil slick floats up to the oil collection bag, and other dispersed oil and part of the oil slick water flow through the voltage stabilization area and enter the electrical floating area. The operating conditions are: device scale Q=200500m3 / d, residence time 5-30rain, current intensity 5(X ) 0 --- 15000A, voltage 3-5V, a large number of fine air bubbles are generated in the electrode, the oil slick in the sewage, most of the dispersed oil and part of the emulsified oil bubbles float up, stick to the fine air bubbles ...

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Abstract

The invention relates to wastewater treatment technique field. The electro-floatation method of the invention for the treatment of oil field waste water comprises the steps: a. the oil field waste water comes into a pretreatment area of an electro-floatation device with a scale of 200 - 500 m3/d, and goes through a baffle, comes into an inclined plate precipitation area, to dramatically cut down the oil content in waste water; b. the waste water being pretreated in the pretreatment area of step (a) continuously comes into the electro-floatation area provided with electrode plates to be treated, and the treating condition is: delaying time 5- 30min, current intensity 6000- 15000 A, voltage 3.5 V, and qualified treated water can be acquired.

Description

technical field [0001] The invention relates to the technical field of wastewater purification treatment. Background technique [0002] In the development of oilfields, especially in the later stages of oilfields, oilfields have to produce a large amount of produced water. For many years, domestic oilfields have mainly adopted the process mode of oil removal section (one oil removal, twelve times of oil removal) and ten filter sections for the treatment of produced water. Among them, the "oil removal section" basically adopts the following methods: (1) physical method, mainly for oil slick in raw water; (2) chemical method, mainly for fractional oil in raw water; (3) coarse-grained method, mainly for raw Dispersed oil in water; (4) flow separation method, mainly to remove oil slick in raw water; (5) air flotation sensitive dissolved gas method, induction method, mainly to remove slick oil and dispersed oil in raw water. [0003] The above methods have achieved certain resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24
Inventor 翁天波
Owner SHANGHAI ZHONGYOU ENTERPRISE GRP CO LTD
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