TY - JOUR
T1 - Sidestream superoxygenation for wastewater treatment
T2 - Oxygen transfer in clean water and mixed liquor
AU - Barreto, Carlos M.
AU - Ochoa, Ivania M.
AU - Garcia, Hector A.
AU - Hooijmans, Christine M.
AU - Livingston, Dennis
AU - Herrera, Aridai
AU - Brdjanovic, Damir
PY - 2018/8/1
Y1 - 2018/8/1
N2 - The performance of a pilot-scale superoxygenation system was evaluated in clean water and mixed liquor. A mass balance was applied over the pilot-scale system to determine the overall oxygen mass transfer rate coefficient (KLa, h−1), the standard oxygen transfer rate (SOTR, kg O2 d−1), and the standard oxygen transfer efficiency (SOTE, %). Additionally, the alpha factor (α) was determined at a mixed liquor suspend solids (MLSS) concentration of approximately 5 g L−1. SOTEs of nearly 100% were obtained in clean water and mixed liquor. The results showed that at higher oxygen flowrates, higher transfer rates could be achieved; this however, at expenses of the transfer efficiency. As expected, lower transfer efficiencies were observed in mixed liquor compared to clean water. Alpha factors varied between 0.6 and 1.0. However, values of approximately 1.0 can be obtained in all cases by fine tuning the oxygen flowrate delivered to the system.
AB - The performance of a pilot-scale superoxygenation system was evaluated in clean water and mixed liquor. A mass balance was applied over the pilot-scale system to determine the overall oxygen mass transfer rate coefficient (KLa, h−1), the standard oxygen transfer rate (SOTR, kg O2 d−1), and the standard oxygen transfer efficiency (SOTE, %). Additionally, the alpha factor (α) was determined at a mixed liquor suspend solids (MLSS) concentration of approximately 5 g L−1. SOTEs of nearly 100% were obtained in clean water and mixed liquor. The results showed that at higher oxygen flowrates, higher transfer rates could be achieved; this however, at expenses of the transfer efficiency. As expected, lower transfer efficiencies were observed in mixed liquor compared to clean water. Alpha factors varied between 0.6 and 1.0. However, values of approximately 1.0 can be obtained in all cases by fine tuning the oxygen flowrate delivered to the system.
KW - Activated sludge
KW - Aeration efficiency
KW - Membrane bioreactor
KW - Oxygen transfer
KW - Speece cone
KW - Wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=85046771079&partnerID=8YFLogxK
U2 - 10.1016/j.jenvman.2018.04.035
DO - 10.1016/j.jenvman.2018.04.035
M3 - Article
AN - SCOPUS:85046771079
SN - 0301-4797
VL - 219
SP - 125
EP - 137
JO - Journal of Environmental Management
JF - Journal of Environmental Management
ER -