BAF Biological Aerated Filters for sewage treatment  

BAF craft features

Biological aerated filters by granular packing bed usually composed, aeration device installed in a packed bed bear near it layer or place, through the reactor can be ShangLiuShi sewage is also can streaming, sewage the substrates and enough oxygen to filter material surface membrane fouling organisms. Whether life sewage treatment or industrial wastewater treatment, and biological aerated filters than traditional biological treatment technology has occupies a small area, the advantages of convenient and flexible.

Working principle

BAF process types and operating mode has a variety of, with different characteristics, but the basic principle is the same. Biological aerated filters of sewage treatment principle is within reactor on the packing attached microbes in biological membrane oxidative decomposition role, packing and biological film adsorption resistance leave function and along the flow direction of the formation of the predator food chain effect classification, and biological membrane internal microenvironment and anaerobic segment of the denitrifying role.

BAF Working Principle and Craft Features 

BAF Craft Features

 Biological aerated filters and activated sludge method, it is characterized by the following features:

(1) has a higher concentration of biological and higher organic load. BAF adopted in the rough porous microbial provides for granular packing more better growth environment, easy to hang film and stable operation, can be in packing surface keep more biomass, microorganism quantity per unit volume is far greater than active sludge the microorganism quantity, high levels of microbe quantity of the volume increased load makes BAF, and reduce the pool volume and cover an area of an area, make the construction cost is reduced greatly.

(2) cover an area of an area small. Because of the reactor in BAF, the treatment effect and packing are positive correlated height, so by adding more packing height to reduce cover an area of an area. Biological aerated filters the volume of a high load, BOD5 volume to load 5 ~ 6 kgBOD5 / (m3 / d), is the conventional activated sludge method or contact oxidation of 6 ~ 12 times.

(3) simple process, the construction cost is low. Because of the packing machinery and filter material surface interception effect of microorganism and metabolism of the formation of the viscous material from the adsorption role bridge, therefore, can save the second pond, thereby reducing the infrastructure costs.

(4) affected by temperature effect is small. Due to close partly or fully enclosed BAF structures, the biochemical reactions by external temperature effect is small, so suitable for cold areas for sewage treatment.

(5) bacteria group of reasonable structure. The traditional activated sludge method, the distribution of microorganism is relatively uniform, and in the BAF from top to bottom to form the different advantages of biological strains, hence make except C, nitrification/denitrification occurred in the same pool in and simplify the process flow.

(6) impact resistance ability. BAF ponds to the organic load, hydraulic load, the change of the temperature not as active sludge method that sensitive.

(7) is easy to operation and management. Biological aerated filters impact resistant load ability, good low temperature resistance, no sludge bulking badly and can avoid loss of microorganisms, and keep high microbial biomass, therefore, the daily operation management simple, the treatment effect is stable.

(8) high quality of effluent water.            

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BAF biological aerator filters with good quality