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Development of four-stage moving bed biofilm reactor train with a pre-denitrification configuration for the removal of thiocyanate and cyanate

Villemur, Richard; Juteau, Pierre; Bougie, Véronique; Ménard, Julie; Déziel, Éric (2015). Development of four-stage moving bed biofilm reactor train with a pre-denitrification configuration for the removal of thiocyanate and cyanate Bioresource Technology , vol. 181 . p. 254-62. DOI: 10.1016/j.biortech.2015.01.051.

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Résumé

Two trains (A and B) of four-stage moving bed biofilm reactors (MBBRs) were developed for the degradation of thiocyanate (SCN(-)), cyanate (OCN(-)) and ammonia (NH3). A pre-denitrification configuration was established in the first-stage reactor of the B train using SCN(-) and OCN(-) as the sole carbon source. SCN(-), OCN(-) and NH3 were completely removed in both trains. The highest removal of total nitrogen equivalent (total-N) occurred at a loading rate of 5.6mg-NL(-1)h(-1). The pre-denitrification configuration resulted in increased total-N removal in the B train (62.6%) compared to the A train (38.5%). Thiobacillus spp. were the predominant bacteria in all MBBRs. Bacteria related to bioprocesses involving anaerobic ammonium oxidation were present in the B train, suggesting that part of nitrogen removal occurs via this pathway. Our results showed that the pre-denitrification configuration increases the efficiency of removal of total-N compounds in the SCN(-)/OCN(-)-degrading MBBR process.

Type de document:
Mots-clés libres: Cyanate; MBBR; Pre-denitrification; Thiobacillus; Thiocyanate
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 08 mai 2017 20:19
Dernière modification: 08 mai 2017 20:19
URI: http://espace.inrs.ca/id/eprint/3270

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