Reactivation of hypersaline aerobic granular sludge after low-temperature storage

Abstract

Chen, Y., Zhu, J. Y., Qin, Y., Zhang, Z. M., & Yuan, S. C.  (March-April, 2017). Reactivation of hypersaline aerobic  granular sludge after low-temperature storage.  Water  Technology and Sciences (in Spanish),  8 (2), 61-70.

 

 Reactivation of hypersaline aerobic granular sludge after  low-temperature storage was studied by slowly increasing  the organic loading. Results indicated that the basic external  features of thawed hypersaline aerobic granules were still  largely intact after a six-week low temperature storage, but  the colors and internal structure changed greatly. Aerobic  granules experienced a process of particle disintegration,  fragmentary particles, filamentous bacteria-like particles,  and dense granules during the recovery process. After  more than one-month re-cultivation, the settling property,  dehydrogenase activity, and nitrification properties of  hypersaline aerobic granules returned to normal. During  the re-cultivated process, the decentralized growth pattern  of particles can be effectively controlled, and granules can  grow compactly by controlling water alkalinity, aeration rate  and reactor settling time.