Fundamental and application of aerobic granulation technology for wastewater treatment（3）
Source： | Date:
2011-05-06
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Keywords:
Aerobic granulation
Sludge may be defined as the microbial biomass utilizing nutrient substrates present in wastewater. Microbial
granules are characterized as dense and compact microbial aggregates with a spherical outer shape. The concept of
aerobic granular sludge reactor has been developed in recent years. Aerobic granules are self-immobilized spherical
aggregates of microorganisms. The growth of aerobic granules were considered to be a special case of biofilm
growth (Liu and Tay, 2002; Yang et al., 2004a). Most of aerobic granules have been cultured in sequencing batch
reactors (SBRs) only. The SBR system is a modified design of the conventional activated sludge process and has
been commonly used for industrial and municipal wastewater treatment (Fig. 1). The sequential steps of feeding,
aeration, settling and discharge of supernatant fluid in a SBR were conducted in the same tank (Metcalf and Eddy,
2003).Compared to the conventional activated sludge, dense and strong microbial structure, good settling ability,
high biomass retention and ability to withstand a high organic loading rate are advantages of aerobic granules
formed in SBRs. Aerobic granulation can be initiated by microbial self-adhesion while bacteria are not likely to
aggregate naturally due to the repulsive electrostatic forces and hydration interactions among them.
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