TY - JOUR
T1 - Partial nitrification of high ammonia concentration wastewater as a part of a shortcut biological nitrogen removal process
AU - Ciudad, G.
AU - Rubilar, O.
AU - Muñoz, P.
AU - Ruiz, G.
AU - Chamy, R.
AU - Vergara, C.
AU - Jeison, D.
N1 - Funding Information:
Authors wish to thank the financial support provided through Research Project DIUFRO 110203 of Dirección de Investigación y Desarrollo from Universidad de La Frontera, Temuco, Chile.
PY - 2005/4
Y1 - 2005/4
N2 - Biological nitrification-denitrification is the most common process for nitrogen removal from wastewaters. During the first step, ammonia is aerobically oxidized to nitrite and then to nitrate. Subsequently, this nitrate is reduced to gaseous nitrogen by denitrifying microorganisms that use it as final electron acceptor. Shortcut biological nitrogen removal is based on the fact that nitrite is an intermediary compound in both steps: a partial nitrification up to nitrite is performed followed by nitrite denitrification. This will produce savings in aeration during the nitrification step. This research studies the effect of dissolved oxygen concentration in nitrite accumulation. An activated sludge reactor is operated under different DO levels, analyzing nitrite accumulation and ammonia removal. Results show that at 1.4 mg DO/L, 75% of nitrite accumulation takes place, with 95% of ammonia removal. Moreover, nitrite accumulation showed to be stable over more than 170 days of operation. Under these conditions, a reduction of 40% in the value of the required mass transfer coefficient KLa is achieved.
AB - Biological nitrification-denitrification is the most common process for nitrogen removal from wastewaters. During the first step, ammonia is aerobically oxidized to nitrite and then to nitrate. Subsequently, this nitrate is reduced to gaseous nitrogen by denitrifying microorganisms that use it as final electron acceptor. Shortcut biological nitrogen removal is based on the fact that nitrite is an intermediary compound in both steps: a partial nitrification up to nitrite is performed followed by nitrite denitrification. This will produce savings in aeration during the nitrification step. This research studies the effect of dissolved oxygen concentration in nitrite accumulation. An activated sludge reactor is operated under different DO levels, analyzing nitrite accumulation and ammonia removal. Results show that at 1.4 mg DO/L, 75% of nitrite accumulation takes place, with 95% of ammonia removal. Moreover, nitrite accumulation showed to be stable over more than 170 days of operation. Under these conditions, a reduction of 40% in the value of the required mass transfer coefficient KLa is achieved.
KW - Activated sludge
KW - Dissolved oxygen
KW - Nitrification
KW - Nitrite accumulation
KW - Nitrogen removal
UR - http://www.scopus.com/inward/record.url?scp=13844296930&partnerID=8YFLogxK
U2 - 10.1016/j.procbio.2004.06.058
DO - 10.1016/j.procbio.2004.06.058
M3 - Article
AN - SCOPUS:13844296930
VL - 40
SP - 1715
EP - 1719
JO - Process Biochemistry
JF - Process Biochemistry
SN - 1359-5113
IS - 5
ER -