TY - JOUR
T1 - Nitrification-denitrification via nitrite accumulation for nitrogen removal from wastewaters
AU - Ruiz, G.
AU - Jeison, D.
AU - Rubilar, O.
AU - Ciudad, G.
AU - Chamy, R.
N1 - Funding Information:
The authors wish to thank the financial support provided by the Research Project DIUFRO 110203 of the Dirección de Investigación y Desarrollo from the Universidad de La Frontera. The authors also want to thank J.L. Campos Ph.D. from the Universidade de Santiago de Compostela, for his support.
PY - 2006/1
Y1 - 2006/1
N2 - The biological nitrification-denitrification process is used extensively for removal of ammonia nitrogen from wastewaters. Saves in aeration, organic matter (for denitrification) and surplus sludge are achievable if nitrite accumulation is possible in the nitrification step. In this paper, operational parameters were studied for each process for maximum nitrite accumulation in the nitrification step and nitrite adaptation in the denitrification step. Nitrite accumulation during nitrification can be controlled by the dissolved oxygen (DO) concentration, presenting a maximum of 65% at around 0.7 mg DO/L. Denitrification can be adapted to nitrite and the process is stable if nitrite in the reactor is keep low. The performance of a continuous stirred tank reactor (CSTR) and an up flow sludge blanket reactor (USB) were compared. Once the operational parameters were established, a CSTR for nitrification and an USB reactor for denitrification were operated in series for 25 days. The process was stable and a steady state was maintained for 20 days, and 93.5% of overall nitrogen removal was achieved in the nitrification-denitrification via the nitrite process.
AB - The biological nitrification-denitrification process is used extensively for removal of ammonia nitrogen from wastewaters. Saves in aeration, organic matter (for denitrification) and surplus sludge are achievable if nitrite accumulation is possible in the nitrification step. In this paper, operational parameters were studied for each process for maximum nitrite accumulation in the nitrification step and nitrite adaptation in the denitrification step. Nitrite accumulation during nitrification can be controlled by the dissolved oxygen (DO) concentration, presenting a maximum of 65% at around 0.7 mg DO/L. Denitrification can be adapted to nitrite and the process is stable if nitrite in the reactor is keep low. The performance of a continuous stirred tank reactor (CSTR) and an up flow sludge blanket reactor (USB) were compared. Once the operational parameters were established, a CSTR for nitrification and an USB reactor for denitrification were operated in series for 25 days. The process was stable and a steady state was maintained for 20 days, and 93.5% of overall nitrogen removal was achieved in the nitrification-denitrification via the nitrite process.
KW - Nitrification-denitrification via nitrite
KW - Nitrite accumulation
KW - Nitrogen removal
KW - Oxygen concentration
KW - nitrite denitrification
UR - http://www.scopus.com/inward/record.url?scp=24944524919&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2005.02.018
DO - 10.1016/j.biortech.2005.02.018
M3 - Article
C2 - 16171689
AN - SCOPUS:24944524919
SN - 0960-8524
VL - 97
SP - 330
EP - 335
JO - Bioresource Technology
JF - Bioresource Technology
IS - 2
ER -
