Device for recovering oil substances in petroleum and coal chemical industry wastewater and operation method thereof

Abstract

The invention discloses a device for recovering oil substances in petroleum and coal chemical industry wastewater and an operation method of the device. The device comprises a first water storage tankbody and a second water storage tank body; a rectification filter plate group, a herringbone coalescence plate group, an inclined tube sedimentation plate group and an oil spilling partition plate are sequentially arranged in the first water storage tank body in the wastewater flowing direction, wherein a water collecting area is formed in an area between the inclined tube sedimentation plate group and the oil spilling partition plate, and an oil collecting area is formed by the oil spilling partition plate and the side wall of the box body on the other side; a first water outlet is formed inthe bottom of the water collecting area; the second water storage tank body is provided with a water collection tank and a water distribution tank; a triangular overflow weir is arranged on the sidewall of the water distribution tank; and a composite nano foam part is obliquely laid between the triangular overflow weir and the water collecting tank from top to bottom. According to the invention,floating oil and dispersed oil are recovered through coalescence and static settlement technologies, and separation of emulsified oil and a water body is realized through a nano-membrane assembly system; the whole device is simple in structure and high in treatment efficiency.

Description

technical field [0001] The invention belongs to the technical field of recovering oily substances in petroleum and coal chemical wastewater, and in particular relates to a device for recovering oily substances in petroleum and coal chemical wastewater and an operating method thereof. Background technique [0002] A large amount of oily wastewater with high oil content will be produced in various processes of oil field exploitation and oil production, as well as in the process of coal conversion and chemical processing. Oil production wastewater usually contains 1000-2000mg / L of petroleum, and some even as high as 5000mg / L; among them, oil substances are typical representatives, and the tar content in gas wastewater is 8000-10000mg / L, which is formed during the pyrolysis process of coal The oily mass concentration of organic wastewater can usually reach 2000-3000mg / L. [0003] Oily substances have high utilization value, if they are not recycled, it will cause a serious wast...

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Problems solved by technology

The air flotation and static sedimentation method can efficiently recover floating oil and dispersed oil, but the removal efficiency of emulsified oil is very low; the chemical demulsification method can achieve efficient removal of emulsified oil, but it needs to consume a large amount of demulsifier, resulting in an increase in demulsification cost. And the addition of demulsifier will cause secondary pollution of water body

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