Document Detail

Formation and long-term stability of nitrifying granules in a sequencing batch reactor.
MedLine Citation:
PMID:  17826990     Owner:  NLM     Status:  MEDLINE    
The formation and long-term stability of nitrifying granules in a sequencing batch reactor was investigated in this study. The results showed that nitrifying granules with a size of 240 microm and SVI of 40 ml g(-1) were formed on day 21 at a settling time of 10 min. Maintaining settling time at 15 min from day 57 to 183 did not affect the physical characteristics of sludge and the fraction of suspended floc in the sludge. In addition, nitrifying granules could tolerate the fluctuations of nitrogen loading rate from 0.72 to 1.8 g l(-1)d(-1) during 2 months without the change of physical characteristics. However, it was observed that complete nitrification to nitrate and partial nitrification to nitrite by sludge converted each other corresponding to the change of the influent NH4+-N concentration. Thus, an appropriate method is needed to maintain a stable complete nitrification or partial nitrification under the conditions with changing influent NH4+-N concentrations and nitrogen loading rates.
Yong-Qiang Liu; Wei-Wei Wu; Joo-Hwa Tay; Jian-Long Wang
Publication Detail:
Type:  Journal Article     Date:  2007-09-10
Journal Detail:
Title:  Bioresource technology     Volume:  99     ISSN:  0960-8524     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-02-26     Completed Date:  2008-05-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3919-22     Citation Subset:  IM    
Institute of Environmental Science and Engineering, Nanyang Technological University, 18 Nanyang Drive, Singapore 637723, Singapore.
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MeSH Terms
Nitrates / analysis
Nitrites / analysis
Nitrogen / chemistry*
Particle Size
Quaternary Ammonium Compounds / analysis
Reg. No./Substance:
0/Nitrates; 0/Nitrites; 0/Quaternary Ammonium Compounds; 0/Sewage; 7727-37-9/Nitrogen

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