To dehydrate aerobic granules to bone-dry form was proposed as a promising option for long-term storage
of aerobic granules. This study cultivated aerobic granules with high proteins/polysaccharide ratio
and then dried these granules using seven protocols: drying at 37 C, 60 C, 4 C, under sunlight, in dark,
in a flowing air stream or in concentrated acetone solutions. All dried granules experienced volume
shrinkage of over 80% without major structural breakdown. After three recovery batches, although with
loss of part of the volatile suspended solids, all dried granules were restored most of their original size
and organic matter degradation capabilities. The strains that can survive over the drying and storage periods
were also identified. Once the granules were dried, they can be stored over long period of time, with
minimal impact yielded by the applied drying protocols.