TY - JOUR

T1 - NH4+ ad-/desorption in sequencing batch reactors

T2 - simulation, laboratory and full-scale studies

AU - Schwitalla, P.

AU - Mennerich, Artur

AU - Austermann-Haun, Ute

AU - Müller, Anneliese

AU - Gruber-Dorninger, Christiane

AU - Daims, Holger

AU - Holm, Niels C.

AU - Rönner-Holm, Sabine G. E.

PY - 2008

Y1 - 2008

N2 - Significant NH 4-N balance deficits were found during the measurement campaigns for the data collection for dynamic simulation studies at five full-scale sequencing batch reactor (SBR) waste water treatment plants (WWTPs), as well as during subsequent calibrations at the investigated plants. Subsequent lab scale investigations showed high evidence for dynamic, cycle- specific NH + 4 adVdesorption to the activated flocs as one reason for this balance deficit. This specific dynamic was investigated at five full-scale SBR plants for the search of the general causing mechanisms. The general mechanism found was a NH + 4 desorption from the activated flocs at the end of the nitrification phase with subsequent nitrification and a chemical NH + 4 adsorption at the flocs in the course of the filling phases. This NH + 4 adVdesorption corresponds to an antiparallel K + ad/-desorption. One reasonable full-scale application was investigated at three SBR plants, a controlled filling phase at the beginning of the sedimentation phase. The results indicate that this kind of filling event must be specifically hydraulic controlled and optimised in order to prevent too high waste water break through into the clear water phase, which will subsequently be discarded.

AB - Significant NH 4-N balance deficits were found during the measurement campaigns for the data collection for dynamic simulation studies at five full-scale sequencing batch reactor (SBR) waste water treatment plants (WWTPs), as well as during subsequent calibrations at the investigated plants. Subsequent lab scale investigations showed high evidence for dynamic, cycle- specific NH + 4 adVdesorption to the activated flocs as one reason for this balance deficit. This specific dynamic was investigated at five full-scale SBR plants for the search of the general causing mechanisms. The general mechanism found was a NH + 4 desorption from the activated flocs at the end of the nitrification phase with subsequent nitrification and a chemical NH + 4 adsorption at the flocs in the course of the filling phases. This NH + 4 adVdesorption corresponds to an antiparallel K + ad/-desorption. One reasonable full-scale application was investigated at three SBR plants, a controlled filling phase at the beginning of the sedimentation phase. The results indicate that this kind of filling event must be specifically hydraulic controlled and optimised in order to prevent too high waste water break through into the clear water phase, which will subsequently be discarded.

KW - Sustainability sciences, Communication

KW - dynamic simulation

KW - NH4+ adsorption

KW - nitrogen removal

KW - process control

KW - SBR

KW - Dynamic simulation

KW - NH+ 4 adsorption

KW - Nitrogen removal

KW - Process control

KW - SBR

UR - http://www.scopus.com/inward/record.url?scp=52949103321&partnerID=8YFLogxK

U2 - 10.2166/wst.2008.388

DO - 10.2166/wst.2008.388

M3 - Journal articles

C2 - 18701784

VL - 58

SP - 345

EP - 350

JO - Water Science and Technology

JF - Water Science and Technology

SN - 0273-1223

IS - 2

ER -