Document Detail

Effect of Dissolved Oxygen Changes on Activated Sludge Fungal Bulking during Lab-scale Treatment of Acidic Industrial Wastewater.
MedLine Citation:
PMID:  21902169     Owner:  NLM     Status:  Publisher    
The cloning and sequencing of fungal 18S rRNA genes followed by the identification of filamentous fungal species by fluorescent in situ hybridization (FISH) and the enumeration of filamentous fungal cells by flow cytometry-FISH (FC-FISH) were used to investigate the effect of dissolved oxygen (DO) changes on activated sludge (AS) fungal bulking during a lab-scale treatment of acidic industrial wastewater. By increasing DO levels from <0.5 to >2 mg L-1, bulking started to occur due to the outbreak of fungal filaments, whereas the chemical oxygen demand (COD) removals sharply increased from <40 to >70%. Clone library analyses revealed that all clonal fungal sequences were of yeast origin, and that only one and four yeast species were individually detected in AS at two DO levels. Subsequent FISH identification of filamentous yeast species within bulking sludge using self-designed oligonucleotide probes suggested that all probe-reactive cells of Trichosporon asahii had a filamentous morphology and were the dominating filamentous microorganism in the AS. The FC-FISH analyses of bacteria and two main yeast species showed that the DO shift resulted in a sharp increase of T. asahii, by a factor of 48-60, which caused filamentous yeast bulking. Subsequently, the restoration of DO levels to <0.5 mg L-1 effectively restored the sludge settlement and yeast community, as well as unacceptable COD removals.
Shaokui Zheng; Jingyan Sun; Hui Han
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-8
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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