Document Detail

Accelerating effect of hydroxylamine and hydrazine on nitrogen removal rate in moving bed biofilm reactor.
MedLine Citation:
PMID:  22484720     Owner:  NLM     Status:  Publisher    
In biological nitrogen removal, application of the autotrophic anammox process is gaining ground worldwide. Although this field has been widely researched in last years, some aspects as the accelerating effect of putative intermediates (mainly N(2)H(4) and NH(2)OH) need more specific investigation. In the current study, experiments in a moving bed biofilm reactor (MBBR) and batch tests were performed to evaluate the optimum concentrations of anammox process intermediates that accelerate the autotrophic nitrogen removal and mitigate a decrease in the anammox bacteria activity using anammox (anaerobic ammonium oxidation) biomass enriched on ring-shaped biofilm carriers. Anammox biomass was previously grown on blank biofilm carriers for 450 days at moderate temperature 26.0 (±0.5) °C by using sludge reject water as seeding material. FISH analysis revealed that anammox microorganisms were located in clusters in the biofilm. With addition of 1.27 and 1.31 mg N L(-1) of each NH(2)OH and N(2)H(4), respectively, into the MBBR total nitrogen (TN) removal efficiency was rapidly restored after inhibitions by NO(2) (-). Various combinations of N(2)H(4), NH(2)OH, NH(4) (+), and NO(2) (-) were used as batch substrates. The highest total nitrogen (TN) removal rate with the optimum N(2)H(4) concentration (4.38 mg N L(-1)) present in these batches was 5.43 mg N g(-1) TSS h(-1), whereas equimolar concentrations of N(2)H(4) and NH(2)OH added together showed lower TN removal rates. Intermediates could be applied in practice to contribute to the recovery of inhibition-damaged wastewater treatment facilities using anammox technology.
Ivar Zekker; Kristel Kroon; Ergo Rikmann; Toomas Tenno; Martin Tomingas; Priit Vabamäe; Siegfried E Vlaeminck; Taavo Tenno
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-8
Journal Detail:
Title:  Biodegradation     Volume:  -     ISSN:  1572-9729     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9100834     Medline TA:  Biodegradation     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Institute of Chemistry, University of Tartu, 14a Ravila St., 50411, Tartu, Estonia,
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