Double-membrane three-phase internal-circulation aeration biological fluidized bed and method for treating wastewater

Abstract

The invention discloses a double-membrane type three-phase internal-circulation aeration biological fluidized bed and a method for treating wastewater, belonging to the technical field of sewage and wastewater treatment. The fluidized bed comprises an aeration system, an internal circulation system, a fixed membrane reaction zone and a settling zone, wherein the internal circulation system comprises a fluidized membrane reaction area formed by an outer cylinder and an inner cylinder; the aeration system is positioned below the inner barrel and is used for providing dissolved oxygen and providing shearing force for the inner circulation system at the same time; a fixed membrane reaction zone is arranged along a shearing force direction, and the fixed membrane reaction zone is separated fromthe internal circulation system through a fluidized membrane separator; and the settling zone is communicated with the outer cylinder through a three-phase separator. According to the invention, theinternal circulation system and a double-membrane system are organically combined, so mass transfer effect is further enhanced, and efficient removal of high-concentration organic matters and high ammonia nitrogen is achieved; and the fluidized bed has the advantage of a small occupied area. Besides domestic sewage treatment, the fluidized bed can also be applied to treatment of chemical wastewater of printing and dyeing, pharmacy and the like.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and more specifically relates to a double-membrane three-phase internal circulation aerated biological fluidized bed and a method for treating waste water. Background technique [0002] Wastewater biological fluidized bed reactor is a high-efficiency biochemical treatment device integrating wastewater fluidization technology and wastewater biological treatment technology. According to the difference of fluid properties in the bed, aerobic biological fluidized bed includes two-phase biological fluidized bed and three-phase biological fluidized bed. In the two-phase biological fluidized bed, the oxygenation of wastewater and the contact between oxygenated wastewater and the carrier are carried out in two devices, the oxygen required by microorganisms is dissolved in the liquid, and the gas does not participate in the fluidization process in the bed; 3. The gas in the biological fluidized bed e...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the common problems of the existing three-phase fluidized bed that the biofilm is easy to fall off, the amount of aeration is large, the configuration is unscientific, and the removal rate of specific nutrients (such as TN) is not high, the present invention provides a double-membrane three-phase fluidized bed. An internal circulation aerated biological fluidized bed device and a method for treating wastewater, in which a fixed film reaction zone and a fluidized film reaction zone are simultaneously set in the fluidized bed device to strengthen denitrification and reduce operating costs;

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