Cold rolling tempering lubricant waste water treatment device and treatment method thereof

Abstract

The invention aims to disclose a device and a method for processing wastewater of cold-rolled leveling liquid. Floating oil in the levelling liquid wastewater is removed through a barrate oil receiving device; the dissolved or emulsified oil is removed through a high-efficiency CAF air floating pool, thereby having little investment and low operating expenses and saving occupied area; the water coming out from the CAF air floating pool enters an anaerobic treatment unit and an MBR membrane biological reaction unit; the water firstly passes through the anaerobic treatment unit, and the anaerobic treatment unit is used as pretreatment of an aerobic treatment unit, thereby avoiding the temperature problem met by aerobic treatment in the prior process and problems that certain organism can not be degraded under the aerobic condition, has overhigh load and impacts load and ensuring that aerobic outlet water is stable and meets the standard; the concentration of organism in the water can be reduced below 100 mg / LCODcr; and the treated water quality reaches first level standard stipulated by Integrated Wastewater Discharge Standard of People's Republic of China (GB8978-1996), thereby realizing the aim of the invention.

Description

Technical field [0001] The invention relates to a wastewater treatment device and a treatment method thereof, in particular to a treatment device and a treatment method for treating waste water containing leveling liquid (sizing liquid) in cold rolling of a steel plant. Background technique [0002] The leveling process is an important process in the production process of cold-rolled steel sheets in steel mills, and is a cold finish rolling process of strip steel after recrystallization and annealing. The wet leveling process in the leveling process can better ensure the realization of the leveling elongation of the cold-rolled steel sheet, and at the same time, it can better clean off the dirt on the surface of the cold-rolled steel sheet, improve the cleanliness of the strip surface, and maintain the leveling machine and The cleaning of each roll surface of the finishing unit avoids defects such as roll marks caused by impurity intrusion and adhesion, and prevents scratches on ...

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Problems solved by technology

[0003] In the leveling process, the leveling liquid wastewater is regularly discharged. Although the discharge of this type of wastewater is not large, it causes relatively large changes in water quality. The COD (chemical oxygen demand) concentration of the leveling liquid wastewater is as high as several thousand or even tens of thousands. Contains pollutants such as oil and surfactant; at the same time, this type of wastewater has good chemical stability, difficult treatment, and extremely serious pollution

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