A horizontal three-phase biological fluidized bed and its sewage treatment method

Abstract

The invention provides a horizontal type three-phase biological fluidized bed and a sewage treatment method thereof. According to the horizontal type three-phase biological fluidized bed, a water inlet and water distribution anaerobic zone, a high-load facultative biological treatment zone, a baffling zone, a low-load aerobic biological treatment zone and a settling pond are horizontally arranged from a water inlet end to a water outlet end, and moreover suspended biological stuffing layers are arranged inside other zones except the baffling zone. Sewage is fed into the water inlet and water distribution anaerobic zone, in an anaerobic environment, BOD organic maters in the wastewater are converted into a fermentation product by facultative fermentation bacteria, polymerized phosphate stored in the cells is decomposed by phosphorus-accumulating bacteria, and then the sewage is fed into the high-load facultative biological treatment zone to remove COD and nitrogen, is further fed into the low-load aerobic biological treatment zone to reduce phosphorus in the effluent, and is finally settled, clarified and filtered by the settling pond so as to obtain clean water. As all process steps are accomplished in one same horizontal pond, the land is saved, the phenomenon that equipment such as a pump and a valve is blocked when dispersed type stuffing is adopted to treat sewage is avoided, and a carrier is prevented from loss, piling or hardening.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a sewage treatment method combined with an activated sludge method and a biofilm method and a horizontal three-phase biological fluidized bed for sewage treatment. Background technique [0002] The process of using microorganisms for sewage treatment is traditionally divided into two categories: activated sludge process and biofilm process. In the 1970s, aerobic biological fluidized bed sewage treatment technology was developed. The basic feature of this kind of sewage treatment is "using granular materials such as sand, ceramsite, activated carbon and synthetic materials as carriers to provide a good environment for the growth of microorganisms." Huge surface area. The mixed fluid of sewage and air passes through the bed at a certain speed from bottom to top to fluidize the carrier” [1] , this method combines the advantages of biofilm and activated sludge, some people also call thi...

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Problems solved by technology

[0007] Although the existing biological fluidized bed has the above advantages, there are also the following problems: (1) the existing biological fluidized bed is easy to block and harden, and the cost of cleaning after blocking and hardening is huge; (2) the existing fluidized bed treatment The scale is limited. According to Section 6.1.4 of "Technical Specifications for Internal Circulating Aerobic Fluidized Bed Sewage Treatment Engineering (HJ2021-2012)" of the Ministry of Environmental Protection, "The maximum sewage treatment capacity of a single fluidized bed is 2500m 3 / d, when the treated water volume is greater than 2500m 3 / d, it is advisable to adopt the mode of joint operation of multiple fluidized beds, but it should not exceed 4 at most, and water distribution facilities should be used when multiple sets are arranged. 3) The design of the existing fluidized bed is basically designed according to the cylindrical structure, the height-to-diameter ratio is required, and the shape and structure are limited

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