Aerobic biological fluidized bed sewage treatment device and process

Abstract

The invention discloses an aerobic biological fluidized bed sewage treatment device which comprises a sealed reactor, and the reactor is respectively provided with an aeration unit, a central cylinderand a three-phase separation unit from bottom to top; a water inlet pipe is arranged on the central cylinder and penetrates through the reactor and the central cylinder to enter the central cylinder;aeration direction of the aeration unit is located between the outer wall of the central cylinder and the inner wall of the reactor; the three-phase separation unit, the inner wall of the reactor andthe sealed top surface define a water outlet settling zone; a reaction area is defined by the three-phase separation unit and the inner wall and the bottom surface of the reactor, and an immobilizedmicroorganism carrier is contained in the reaction area; the reactor at the upper part of the effluent settling zone is connected with a water outlet unit; and the sealed top surface of the three-phase separation unit, which is in contact with the reactor, is connected with an exhaust unit. The device is simple in structure, low in energy consumption, high in sewage treatment efficiency and high in carrier separation efficiency. Meanwhile, a corresponding treatment process is provided, and high efficiency and effective operation of sewage treatment can be fully guaranteed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an aerobic biological fluidized bed sewage treatment device and process. Background technique [0002] Biological fluidized bed technology is a high-efficiency biological treatment technology that began to be studied and applied to sewage treatment in the 1970s. It uses fluid (liquid, gas) to fluidize the carrier with microorganisms growing on the surface, and at the same time degrades organic pollutants. Biofilm treatment technology. The characteristic of aerobic biological fluidized bed technology is that microorganisms are attached to the carrier, and the carrier circulates in the reactor, so there will be no problem of microbial loss. The concentration of microorganisms in the reactor is high, which increases the volume load of the device. At the same time, it can prolong the residence time of slow-proliferating microorganisms (such as nitrifying bacteri...

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Problems solved by technology

[0003] However, the shortcomings of the current aerobic biological fluidized bed technology are also obvious. In order to maintain the full fluidization of the carrier, the amount of aeration is large and the energy consumption is large. The main reason is that the immobilized microbial carrier is made of ceramsite, and the proportion of rubber is relatively large. 1.3~1.5g / cm 3 , and the dosage of the carrier is large, at 15% to 30%, it is easy to produce accumulation, which makes the treatment effect difficult to meet the requirements. In addition, the aerobic biological fluidized bed usually adopts a labyrinth carrier separator, such as Chinese patent document CN03123800.9, its structure It is composed of three interlaced triangular reflective cones. The reflective cone adopts an isosceles right triangle structure. The sliding slope of the reflective cone is small, which is not conducive to the sliding of the carrier. At the same time, the surface of the reflective cone is corroded and rough, and the complex structure causes large processing errors. and other comprehensive factors, affecting the effect of carrier separation, leading to problems such as carrier loss

[0004] Chinese patent document CN201458905U provides a reactor coupled with a biofilter and an aerobic fluidized bed, the biofilter is set above the aerobic fluidized bed, and the biofilter utilizes the tail gas of the aerobic fluidized bed as an oxygen source , so that the aeration is fully utilized, and the problem of carrier loss is avoided, but because the aerobic fluidized bed is set under the biofilter in this reactor, it is impossible to flush the biofilter, and it will fail after a period of use It will cause blockage of the reactor, and the filler used is cylindrical polypropylene, which is prone to accumulation and floating problems

The carrier separator used in this method also cannot avoid the problem of carrier loss due to its complex structure and low separation efficiency. The carrier is ceramic and TiO 2 Porous sintering, not only high density, difficult fluidization, but also the oxygen free radicals produced are extremely strong oxidants, and have a bactericidal effect on microorganisms

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