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In-situ ammonia removal by methanogenic granular biomass

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Title In-situ ammonia removal by methanogenic granular biomass
 
Creator Saha, Shaswati
Vrieze, Jo De
Biswas, Rima
Nandy, Tapas
 
Subject Water Treatment
Microbiology
 
Description Methanogenic grannules from sewage-fed 298-day old UASB reactor having high abundance of Nitrospira sp. were
evaluated for simultaneous methanogenesis and nitrification. Batch experiments were conducted under anaerobic and
oxygen limited condition using either 0.04% (v/v) methanol (C) or ammonium chloride (30-100 mg N/L) (N) or both (N+C).
Results showed that C-utilization preceded N-utilization in N+C sets indicating methanogenesis was independent of
ammonia removal. Ammonia removal with nitrate generation under oxygen-limited condition confirmed nitrification
potential of methanogenic grannule. However, under anaerobic conditions, decrease in ammonium nitrogen did not result
in stoichiometric increase in nitrite & nitrate concentrations. Further, hydrogenotrophic methanogens disappeared in N &
N+C sets. H2-mediated denitrification could possibly atrribute for disappearance of both nitrite or nitrate and
hydrogenotrophic methanogens. Increase in Methanosaetaceae compensated for methane production via acetoclastic
route. Thus, simultaneous nitrification & H2-mediated denitrification was confirmed as the plausible route for ammonia
removal in methanogenic granules under anaerobic condition. This finding of in-situ ammonia removal in methanogens
has opened new avenues for treating C/N wastewaters.
 
Publisher RSC
 
Date 2018
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1218/1/10.1039%40C7EW00444C.pdf
Saha, Shaswati and Vrieze, Jo De and Biswas, Rima and Nandy, Tapas (2018) In-situ ammonia removal by methanogenic granular biomass. Environmental Science: Water Research & Technology (4). pp. 559-568. ISSN 2053-1400
 
Relation https://pubs.rsc.org/en/journals/journalissues/ew#!recentarticles&adv
http://neeri.csircentral.net/1218/