Oilfield wastewater treatment process based on special membrane

Abstract

The invention discloses an oilfield wastewater treatment process based on a special membrane. The oilfield wastewater treatment process based on the special membrane comprises a first stage, namely oil removal and suspended matter removal, a second stage, namely oxidation and gel breaking by virtue of an electrochemical device, and a third stage, namely desalination and COD removal by virtue of a core SuperRO system. The oilfield wastewater treatment process based on the special membrane has the advantages that a nano air floatation device is adopted for carrying out oil removal and suspended matter removal, sludge and wastewater are subjected to materialization by utilizing the electrochemical device with the best oxidizing capacity, the mass transfer efficiency among substances is improved, the reaction time is shortened and the drug consumption is reduced, so that the wastewater can directly enter a membrane system only after simple pre-treatment is carried out, the stable operation and service life of the system are guaranteed, and the environmental construction cost and the sewage treatment operating cost are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an oil field wastewater treatment process based on a special membrane. Background technique [0002] Oilfield wastewater usually includes oilfield produced water, fracturing flowback fluid, drilling wastewater, mine rainwater and domestic sewage. [0003] The liquid (produced fluid) extracted together with crude oil from the formation contains both crude oil and sewage, and the water separated by dehydration of crude oil is called "oilfield produced water", which is the most important wastewater in oilfield development and production. It mainly comes from the crude oil dehydration station, the bottom water of various crude oil storage tanks in the joint station, and the sewage after washing the salty crude oil with other clean water. [0004] Due to the different geological conditions of crude oil production areas, crude oil properties, water injection properties, and t...

AI Technical Summary

Problems solved by technology

Its advantages are relatively low operating costs and relatively mature management. The disadvantages are that the one-time project investment is relatively high, which has a direct impact on surrounding oil fields and oil reservoirs in the surrounding sections, and has a direct impact on surrounding groundwater. There are also more restrictions

The existing problems are ① the operating cost is too high, depending on the water quality, the general operating cost is as high as 100 yuan / ton of water; ② the salt is not removed, and the local environmental protection requirements cannot be truly met; ③ a large number of new chemical agents are introduced, resulting in secondary secondary pollution

The existing problems are ① introducing evaporation can solve the salt problem, but direct evaporation investment and operating costs are too high; ② evaporative condensate may not meet the COD standard; ③ introducing a large number of new chemicals will cause secondary pollution

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