The composition of medical sewage from medical institutions is relatively complex, containing many chemicals, various pathogenic microorganisms, etc. Green development and ecological environment protection are the common expectation and responsibility of human society. Ensuring the standard discharge of medical sewage and scientific management has become one of the important tasks of modern hospital management. Especially during the current COVID-19 epidemic, the management of hospital sewage treatment must be strengthened. In 2021, the National Health Commission issued the Technical Standards for Sewage Treatment Engineering in Medical Institutions (Draft for Comments) to further regulate sewage treatment in medical institutions.

As a large comprehensive hospital, with the number of patients increasing year by year, the amount of medical sewage also increases. In combination with the site environment of the hospital, in order to save the floor area, the hospital uses the air floater as the main sewage treatment equipment.

The air flotation machine is widely used to remove various heavy metal ions, separate oil from oily wastewater, remove impurities from tanning wastewater, remove chroma and impurities from printing and dyeing wastewater, and remove suspended solids and chroma from pharmaceutical wastewater. It is an environmental protection device widely used in domestic sewage treatment in recent years. Its main function is to achieve solid-liquid separation, which can effectively remove SS, oil and color in sewage, and reduce COD. Its working principle is: add proper amount of polyaluminum chloride (flocculant, PAC) and polyacrylamide (coagulant, PAM) into the sewage to form flocs through flocculation; The microbubbles generated by the gas dissolving system are combined with the flocs in the water, and the flocs rise to the water surface with the microbubbles, and then are removed.

The air flotation machine has simple structure and stable treatment effect. After the transformation of the original hospital sewage treatment station, Zhongqiao Tus successively passed through the grid, regulating tank, air flotation machine, disinfection tank, dechlorination tank and collecting tank, and all pollutant indicators met the requirements of the Discharge Standard of Water Pollutants for Medical Institutions.

The structure of the air flotation machine is simple, and the requirements for installation conditions are relatively low. As long as there is a certain installation space, the improvement and installation of the sewage treatment station can be carried out. At the same time, the air floater facilities also have a good advantage in operating costs.

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