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The aerated biological filter combines biological contact oxidation and filtration. There is no sedimentation tank, and the cycle operation of the filter is realized through backwash regeneration. The aerated biological filter has been greatly developed in the early 1990s, with a maximum size of several hundred thousand tons per day, and it can remove nitrogen and phosphorus, and has been widely used in the upgrading of sewage treatment plants.
Features of aerated biological filter:
1. One-time investment is 1/4 lower than traditional methods.
2.The area is 1/10 ~ 1/5 of the conventional process, and the operating cost is 1/5 lower.
3. Suspended water requires 50 ~ 60mg / L, it is best to combine with the first-level enhanced treatment, such as the use of hydrolytic acidification tank
4. The filler is mostly shale ceramsite, diameter 5mm, layer height 1.5 ~ 2m
5. The counter-current flow of water down and gas up may not be provided with a secondary sink.
I. Downflow biological aeration filter
1. Process characteristics
The bioreactor is filled with a particulate filter material with a high specific surface area as a carrier for the growth of a microbial membrane. Sewage filters from top to bottom or bottom to top. Blow the air under the filter layer to make the organic matter in the sewage react with the biofilm, and at the same time play the role of physical filtration. Regularly backwash the filter material with water and air from bottom to top to clean the filter material and keep the equipment normal. run.
The structure of aerated biological filter is similar to that of ordinary biological filter. It consists of filter body, filter material layer, support layer, water and gas distribution system, recoil system, water outlet system, and piping system. Filters are round, square and rectangular.
At present, clay ceramsite and shale ceramsite are mostly used. The grain size is generally 3-6mm, clay ceramsite is 4.89m2 / g, and the specific surface area of shale ceramsite is 3.99m2 / g.
Inlet water concentration COD is allowed to reach 1000 ~ 1500mg / L, and no anaerobic phenomenon of filter will occur. The BOD load can be as high as 6kgBOD / (m3 * d). The effluent SS and BOD can be kept below 10mg / L, the COD can be less than 60mg / L, the power consumption is 0.3kw / t, and the area is 1/10 ~ 1/5 of the activated sludge method or contact oxidation method
2. Upflow aerated biological filter (UBAF)
The hydrolytic acidification tank retains suspended matter in the water and degrades organic matter, hydrolyzes large organic matter into small molecular organic matter, and degrades solid organic matter to reduce the amount of sludge, reduce the amount of sludge, and reduce the workload of subsequent filters.
Choice of sewage biochemical treatment scheme
At present, most of the domestic use of oxidation ditch and SBR technology imported from abroad, this delayed aeration process is a low load process, the tank capacity and equipment are several times the medium and high load activated sludge process, delayed aeration on pollution The aerobic stabilization method is adopted for the sludge, which consumes 40% ~ 50% more energy than the medium and high load activated sludge process. This process does not meet the national conditions of insufficient resources and a large population in China, and advanced processes such as hydrolysis-aerobic process and aerated biological filter are relatively superior.