Traditional Culture Encyclopedia - Traditional festivals - Comparison of the advantages and disadvantages of biofilm method and activated sludge method, anyone who knows the details please inform, thank you!
Comparison of the advantages and disadvantages of biofilm method and activated sludge method, anyone who knows the details please inform, thank you!
Compared with the activated sludge method, the biofilm method has the following characteristics.
① solidified on the solid surface of the biofilm on the wastewater quality, water quality changes have a strong adaptability, good operational stability.
② does not occur sludge expansion, operation and management is more convenient.
③ Because the microorganisms are fixed on the solid surface, even the slow proliferation rate of microorganisms can grow and reproduce. In the activated sludge method, the microorganisms with longer generation period than residence time are discharged from the aeration tank, so the biological phase in the biofilm is more abundant, and the biological populations in the membrane along the direction of water flow have a certain distribution.
④ With the presence of high trophic level microorganisms, organic matter metabolism on the transfer of more energy, synthesis of new cells that the amount of residual sludge is less.
⑤ Natural ventilation for oxygen supply.
⑤ Natural ventilation is used for oxygen supply.
⑥ Active organisms are difficult to control artificially, thus less flexible in operation.
⑦ Due to the small specific surface area of the carrier material, the volume load of the equipment is limited, and the space efficiency is low. Foreign operating experience shows that in the treatment of municipal wastewater, biofilter treatment plant treatment efficiency than activated sludge treatment plant is slightly lower. 50% of the activated sludge treatment plant BOD5 removal rate is higher than 91%, 50% of the biofilter treatment plant BOD5 removal rate of 83%, respectively, the corresponding effluent BOD5 for 14 and 28mg / L.
Reference:
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