کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
690849 1460436 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Freezing of aerobic granules for storage and subsequent recovery
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Freezing of aerobic granules for storage and subsequent recovery
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 44, Issue 5, September 2013, Pages 770–773
نویسندگان
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