TY - JOUR
T1 - Evaluating the potential for dissimilatory nitrate reduction by anammox bacteria for municipal wastewater treatment
AU - Castro-Barros, Celia M.
AU - Jia, Mingsheng
AU - van Loosdrecht, Mark C.M.
AU - Volcke, Eveline I.P.
AU - Winkler, Mari K.H.
PY - 2017
Y1 - 2017
N2 - Anammox bacteria can perform dissimilatory nitrate reduction to ammonium (DNRA) with nitrite as intermediate coupled to the oxidation of volatile fatty acids (VFA). Batch tests with enriched anammox and a co-culture of anammox and heterotrophic bacteria showed the capacity of Candidatus ‘Brocadia fulgida’ to perform the DNRA coupled to the anammox reaction (DNRA-anammox) at a high rate although the culture was not previously adapted to VFA. From thermodynamic calculations it could be stated that low COD/N influent ratios favour the DNRA-anammox transformation over heterotrophic conversions since more free energy is gained. A process scheme is proposed for an innovative nitrogen removal system in which the nitrate produced by nitrite oxidizing bacteria and/or anammox bacteria is converted during DNRA-anammox pathway, resulting in a sustainable nitrogen removal from municipal wastewater while circumventing the troublesome out-selection of nitrite oxidizing bacteria encountered in mainstream applications.
AB - Anammox bacteria can perform dissimilatory nitrate reduction to ammonium (DNRA) with nitrite as intermediate coupled to the oxidation of volatile fatty acids (VFA). Batch tests with enriched anammox and a co-culture of anammox and heterotrophic bacteria showed the capacity of Candidatus ‘Brocadia fulgida’ to perform the DNRA coupled to the anammox reaction (DNRA-anammox) at a high rate although the culture was not previously adapted to VFA. From thermodynamic calculations it could be stated that low COD/N influent ratios favour the DNRA-anammox transformation over heterotrophic conversions since more free energy is gained. A process scheme is proposed for an innovative nitrogen removal system in which the nitrate produced by nitrite oxidizing bacteria and/or anammox bacteria is converted during DNRA-anammox pathway, resulting in a sustainable nitrogen removal from municipal wastewater while circumventing the troublesome out-selection of nitrite oxidizing bacteria encountered in mainstream applications.
KW - Anammox
KW - Dissimilatory nitrate reduction
KW - DNRA
KW - Nitrogen removal
KW - VFA
UR - http://www.scopus.com/inward/record.url?scp=85014832744&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2017.02.063
DO - 10.1016/j.biortech.2017.02.063
M3 - Article
C2 - 28285229
SN - 0960-8524
VL - 233
SP - 363
EP - 372
JO - Bioresource Technology
JF - Bioresource Technology
ER -
