Moving Bed Biofilm Reactor (MBBR) requires suspended fillers with specific gravity close to water, large effective specific surface area, and suitable for microbial growth. Biomedia can be suspended in the biochemical tank with slight agitation, are easy to move freely with water, and can form a good fluidized state.
Under aerobic conditions, the rising buoyancy of the air bubbles generated during aeration and oxygenation can push the filler and the surrounding water to flow. When the airflow passes through the water flow and the gap between the filler, it is blocked by the filler and divided into small bubbles.
In such a process, the filler is sufficiently stirred and mixed with the water flow, and the air flow is sufficiently divided into fine bubbles, which increases the contact between the biofilm and the oxygen and the efficiency of oxygen transfer.
Under anaerobic conditions, the water flow and the filler are fully fluidized under the action of the submersible agitator to achieve the purpose of full contact and degradation of the biofilm and the treated pollutants.
The core of the MBBR process is to realize the full fluidization of the suspended carrier filler to achieve the purpose of strengthening the treatment of pollutants. In the actual application of the MBBR process, the main factors that need to be considered are the type of biochemical tank, the amount of suspended fillers, aeration system, interception screens, and propellers.
The fluidization of the biological filler in the aeration zone is the key to the system's good processing function. It mainly depends on the aeration system of the aerobic zone of the biochemical tank. An appropriate aeration system in the aerobic zone can ensure the fluidization effect of the biological fluidized carriers mbbr, ensure that the fluidized filler flows up and down and back and forth in the water body, so that the filler and sewage can be fully mixed, collided, and contacted, which is effective Complete the three-way contact, exchange, and adsorption processes of pollutants, water and gas.
The specific gravity of the filler is generally selected to be 0.94-0.97. During the culture period, a large amount of biofilm will slowly adhere to the surface of the filler. The greater the amount of adhesion, the specific gravity gradually increases. When the biofilm on the filler reaches a certain thickness, its specific gravity is greater than 1. From the non-aeration zone to the bottom of the pool, the impact force at the bottom of the aeration zone is the strongest, which can quickly wash away the residual biofilm on the filler. The specific gravity of the filler after stripping is also reduced to less than 1, and the aeration The area rises.
According to the characteristics of the specific gravity changes before and after the film is attached, bio mbbr can be tumbling in the aeration area and the non-aeration area with the water flow, thereby alternately completing the growth and shedding process of the biofilm, ensuring the quantitative stability and activity of the biofilm, and making the process run better. Stablize. In order to prevent the fluidized suspended filler from entering the next link with the mixed liquid, a screen is designed to be simply intercepted and separated in an appropriate position in the aerobic zone. The screen material is made of stainless steel, and the type is matched with the suspended packing.
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