Carrier fixed bed bioreactor and water treatment system

Abstract

The invention discloses a carrier fixed bed bioreactor and a water treatment system comprising the carrier fixed bed bioreactor. The carrier fixed bed bioreactor comprises a tank body and a fillter; alower-layer hole net is arranged at the lower part of the tank body and is used for supporting a filler, a plurality of lower holes penetrating through the lower-layer hole net in the thickness direction are formed in the lower-layer hole net, and the diameter of the lower holes are designed to be smaller than the diameter of the filler; an upper-layer hole net is arranged at the upper part of the tank body and is used for blocking the filler, a plurality of upper holes penetrating through the upper-layer hole net along the thickness direction are formed in the upper-layer hole net, and the diamerter of the upper holes is designed to be smaller than that of the filler; the filler is kept in a space defined by the lower-layer hole net, the upper-layer hole net and the corresponding side walls of the tank body, and the total volume of the filler is smaller than the volume of the space, so that when the filler is deposited on the lower-layer hole net, the top of the filler is separated from the upper-layer hole net, wherein the density of the filler is slightly larger than that of water, so that the filler is deposited on the lower-layer hole net when water introduction is stopped, and the filler floats and is blocked by the upper-layer hole net when the flow speed of introduced water reaches a preset flow speed or above.

Description

technical field [0001] The present invention relates to the technical field of water treatment, in particular to a carrier fixed bed bioreactor (FixedBed Biological Reactor, abbreviated as FBBR), and a water treatment system including the carrier fixed bed bioreactor. Background technique [0002] The biofilm treatment process represented by aerated biological filter and carrier fluidized bed (MBBR) has the advantages of high organic load, small footprint, and strong impact load resistance, and is especially suitable for urban sewage and industrial wastewater where the site is tight. Secondary biochemical treatment and advanced treatment. However, these two processes also have their own obvious shortcomings: [0003] The main disadvantage of the biological filter process is that the biological treatment process cannot be carried out continuously. Due to the growth of the biofilm on the biological filter material and the interception of suspended solids in the influent, the ...

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Problems solved by technology

In order to bear the working load of different conditions of biological filter materials, especially to meet the needs of effective backwashing, the structure of the filter plate and the body of the biological filter are more complicated and the cost is higher.

Although the biological filter has a certain interception and filtration effect on suspended particles, the concentration of suspended solids in the effluent is still high. In most cases, it is difficult to meet the requirements for total phosphorus and suspended solids in the effluent, and generally still requires further treatment such as filtration.

[0004] Although the carrier fluidized bed (MBBR) process is a continuous biochemical treatment, and the head loss is relatively small, because its filling rate cannot be too high (generally about 50%), its biomass per unit volume is significantly lower than that of the biological filter. Biochemical reaction volume load is generally less than half of the biofilter

Due to some inherent shortcomings of the MBBR process, such as filler fluidization, screen interception, filler clogging, etc., the carrier fluidized bed needs to adopt a circulating flow pool type, with sufficient mixing and stirring, and the required stirring and aeration intensity is relatively large. , higher energy consumption compared with other biochemical treatment processes

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