A moving bed biofilm reactor

Abstract

The invention relates to a moving bed bio-membrane reactor provided with a biochemical reaction pool. A water inlet hole and a water outlet hole are formed in the upper portions of any two side walls of the biochemical reaction pool respectively and connected with a water inlet pipe and a water outlet pipe respectively. Suspended filler is thrown in the biochemical reaction pool, a conical sliding table is arranged in the center at the bottom in the biochemical reaction pool, a flow guiding barrel is arranged over the conical sliding table, a water outlet screen is arranged at the upper portion in the flow guiding barrel, the upper end of the water outlet screen is communicated with the water outlet hole through the water outlet pipe, the bottom of the flow guiding barrel is connected with a water outlet grate support, and an aerator pipe is arranged on the part, located on the periphery of the flow guiding barrel, at the bottom of the biochemical reaction pool. The moving bed bio-membrane reactor is simple and novel in structural design, has very high application and popularization value and is mainly applied to the sewage treatment technology.

Description

technical field [0001] The invention relates to the technical field of sewage treatment process equipment, in particular to a moving bed biofilm reactor. Background technique [0002] The moving bed biofilm reactor (MBBR) process absorbs the advantages of the traditional fluidized bed and biological contact oxidation processes. The core is to directly add a certain proportion of suspended fillers with a specific gravity close to water into the reactor as microorganisms. The active carrier can greatly increase the biomass and biological species in the reactor, thereby improving the efficiency of sewage treatment. [0003] The core of the MBBR process technology is how to make the filler move freely under the action of the mixed liquid in the reactor, and move back and forth in a suspended state in the water; when the sewage passes through the MBBR reactor continuously, the filler filled in the reactor passes through the microbial Inoculate, and gradually form a biofilm on th...

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Problems solved by technology

But at present, it is difficult to do it in most of the actual engineering design, so it exists in different degrees in the actual engineering, the air intake distribution in the whole reaction tank is uneven, the moving state of the suspended filler in the reaction tank is not balanced, and the different degrees in the tank There is a dead zone in the ground, which is prone to the defects of local filler accumulation; or blindly increasing the aeration volume in order to overcome these defects, resulting in excessive aeration energy consumption

[0007] 2. Due to the special hydraulic characteristics requirements of the MBBR reactor, it is difficult to achieve large-scale. Due to the special hydraulic characteristics requirements of the MBBR aerobic biochemical reaction tank, in order to overcome the defects of different degrees of dead zones in the reaction tank and the easy occurrence of local filler accumulation, it is necessary to Extensive testing to optimize the construction of the reaction tank and its hydraulic characteristics

Therefore, in the traditional MBBR aerobic biochemical reaction tank, in order to avoid the occurrence of the above phenomenon, the tank volume of each single reaction tank body should not be too large. When a large MBBR aerobic biochemical reaction tank is required in an actual project, only multiple small ones can be used. MBBR aerobic biochemical reaction tanks are realized in series or in parallel, which increases the difficulty of engineering construction and increases the cost of the project. This is why the MBBR process is mostly suitable for small and medium-sized domestic sewage and industrial organic wastewater treatment in practical engineering applications, especially The reason for the integrated sewage treatment plant

[0008] 3. The possible disadvantages of the large-scale MBBR reactor: When it is necessary in actual engineering, or if you want to improve the single-tank daily processing capacity of the MBBR aerobic biochemical reaction tank, you need to set the reaction tank body in the form of a rectangle. In the design form, the suspended filler will gather to the water outlet with the direction of water flow, so it is necessary to install filler return equipment and pipelines at the water outlet

However, the backflow of fillers will greatly increase the energy consumption of the system. At the same time, the fillers collide with each other in the pipeline, which will cause a large amount of anaerobic and anoxic biofilms to fall off on the fillers and affect the treatment effect of the system; Filling blockage is prone to occur. In addition, underwater agitators arranged in random places are prone to hydraulic dead angles, which also lead to a large amount of fillers accumulating in the dead water area. Otherwise, it is necessary to set up a high-power agitator for agitation, and the agitation intensity is too high. The consumption is too high, and the second is that it will cause the wear of the suspended packing and the biofilm on the packing is not easy to attach

[0009] 4. The outlet end of the MBBR reactor is equipped with grids and grids to intercept fillers, which are prone to blockage

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