Due to the unique mud membrane symbiosis system of the MBBR process, the activated sludge method and the biofilm method can be organically combined, and it has the significant advantages of the mud membrane symbiosis technology. The activated sludge method and the biofilm method are ingeniously combined in Together.
There are nitrifying bacteria in the biofilm produced in MBBR suspended filler, and the exfoliation of the biofilm will inoculate the mixture. Compared with the single activated sludge method under the same average cell residence time of suspended solids in the same mixture, this biofilm exfoliation and Inoculation will significantly increase the proportion of nitrifying bacteria in the mixed solution. Therefore, the presence of biofilm carriers can help increase the nitrification rate per tank volume, enhance the nitrification capacity of the secondary treatment process, and further improve the removal efficiency of ammonia nitrogen.
Its main application features are as follows:
1. Suitable for severe cold areas with extremely low inlet water temperature
In China's Inner Mongolia and Northeast China, the cold winter season generally lasts for half a year. In the case of continuous low temperature of sewage influent, the growth of activated sludge and the ability to degrade pollutants will be greatly affected.
The MBBR process system has a biofilm system that is not available in the ordinary activated sludge method, and has a stronger ability to resist low temperatures. For example, in Chifeng County, Inner Mongolia, China, when the sewage inlet temperature reaches 4°C, the effluent water quality index is continuously monitored 1 A month later, it was discovered that the pollutant indicators could still meet the national emission standards.
2. Suitable for reconstruction and expansion projects
Because the MBBR process adds suspended fillers to the biochemical tank, the activated sludge flora of the suspended filler in the biochemical tank can grow without affecting the original biochemical tank flora.In this way, the amount of treated water can be increased without moving the civil construction.The increase in the amount of treated water greatly reduces the workload of the expansion project and at the same time reduces the construction land. However, while the MBBR process brings great convenience, it is also necessary to pay attention to design issues.
The proportion of suspended fillers added in the original biochemical tank should be moderate. Excessive addition of suspended fillers will cause difficulties in fluidization of the filler. According to actual engineering experience, the maximum dosage of suspended fillers is 60% of the tank volume in the aerobic zone. There is a margin in the design, and the dosage ratio will not exceed 50%, otherwise the difficulty of fluidization of the filler will cause serious problems such as filler accumulation, clogging of the screen, and overflow of the biochemical tank.
3. The flow area of the screen and the aeration system should be designed reasonably
As the general MBBR process suspended filler size is 25mm circular porous filler, the suspended filler is in a state of flow and circulation in the aerobic zone. In order to prevent the suspended filler from entering the next structure with the water flow and causing the loss of the filler. In the MBBR process suspended filler area, it needs to be set interception screen intercepts the suspended filler.
In the design, it is necessary to consider the overflow of the screen mesh while intercepting the packing. If the overflow is insufficient or the bottom aeration system is unreasonably designed, it will cause the suspended packing to accumulate at the screen. This will have a negative impact on the overflow. In severe cases, the suspended fillers will be completely blocked at the screen, causing the water in the biochemical pool to not enter the next unit, and eventually leading to the occurrence of pooling.
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