کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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690849 | 1460436 | 2013 | 4 صفحه PDF | دانلود رایگان |
Aerobic granules stored in liquid medium can lose structural integrity during storage. Freezing and thawing is applied for disintegrating and then compacting sludge flocs into pellets. This study stored aerobic granules cultivated by seeding activated sludge into column-type sequential batch reactors and fed with synthetic wastewater at organic loading rate of 1.5 kg/(m3 d) at −20 °C for 40 days, and then thawed and recovered the frozen granules in 1 day. The present granules have a resilient granule matrix that can resist engulfing of freezing front in freezing. The microbial communities of the frozen and re-cultivated granules were probed using polymerase chain reaction-denaturing gradient gel electrophoresis technique. The family Xanthomonadaceae and the genus Comamonas can survive during freezing and thawing and could contribute to maintain structural integrity in re-cultivation stage.
► Aerobic granules were stored at −20 °C for 40 days and thawed and recovered in 1 day.
► The granules have a resilient granule matrix that can resist disintegration in freezing.
► The family Xanthomonadaceae and the family Comamonas survive in freezing.
► Strains could contribute to structural integrity were discussed.
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 44, Issue 5, September 2013, Pages 770–773