naa a22 4500 510821685 CHVBK 20180411083536.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s11814-013-0163-z doi (NATIONALLICENCE)springer-10.1007/s11814-013-0163-z Achieving partial nitrification in a novel six basins alternately operating activated sludge process treating domestic wastewater [Elektronische Daten] [Rusul Mohammed, Saad Arab, Lu Xiwu] A novel technology was developed to achieve partial nitrification at moderately low DO and short HRT, which would save the aeration cost and have the capacity to treat a wide range of low-strength real wastewater. The process enables a relatively stable whereas nitrite accumulation rate (NO2-AR) was stabilized over 94% in the last aerobic basin on average of each phase through a combination of short HRT and low DO level. Low DO did not produce sludge with poorer settleability. The morphology and internal structure of the granular sludge was observed by using a scanning electron microscope (SEM) analysis during a long-term operation. The images indicated that thick clusters of spherical cells and small rod-shaped cells (NOB and AOB are rod-shaped to spherical cells) were the dominant population structure, rather than filamentous and other bacteria under a combination of low DO and short HRT, which gives a good indication of nitrite accumulation achievement. MPN method was used to correlate AOB numbers with nutrient removal. It showed that an ammonia-oxidizing bacterium (AOB) was the dominant nitrifying bacteria, whereas high NO2-AR was achieved at AOB number of 5.33×108 cell/g MLSS. Higher pollutant removal efficiency of 86.2%, 98% and 96.1%, for TN, NH 4 + -N, and TP, respectively, was achieved by a novel six basin activated sludge process (SBASP) at low DO level and low C/N ratio which were approximately equal to the complete nitrification-denitrification with the addition of sodium acetate (NaAc) at normal DO level of (1.5-2.5 mg/L). Korean Institute of Chemical Engineers, Seoul, Korea, 2013 SBASP nationallicence N-P Removal nationallicence Nitrite Accumulation Rate nationallicence NO2-AR nationallicence SEM Analysis nationallicence Mohammed Rusul School of Energy and Environment, Southeast University, Sipailou Road, 210096, Nanjing, P. R. China aut Arab Saad School of Energy and Environment, Southeast University, Sipailou Road, 210096, Nanjing, P. R. China aut Xiwu Lu School of Energy and Environment, Southeast University, Sipailou Road, 210096, Nanjing, P. R. China aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/11(2013-11-01), 2043-2051 0256-1115 30:11<2043 2013 30 11814 https://doi.org/10.1007/s11814-013-0163-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-013-0163-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mohammed Rusul School of Energy and Environment, Southeast University, Sipailou Road, 210096, Nanjing, P. R. China aut NATIONALLICENCE 700 1- Arab Saad School of Energy and Environment, Southeast University, Sipailou Road, 210096, Nanjing, P. R. China aut NATIONALLICENCE 700 1- Xiwu Lu School of Energy and Environment, Southeast University, Sipailou Road, 210096, Nanjing, P. R. China aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/11(2013-11-01), 2043-2051 0256-1115 30:11<2043 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer