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Korean Journal of Chemical Engineering, Vol.30, No.11, 2043-2051, 2013
Achieving partial nitrification in a novel six basins alternately operating activated sludge process treating domestic wastewater
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, NH4+-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).
[References]
- Yoo CK, Kim DS, Cho JH, Choi SW, Lee IB, Korean J. Chem. Eng., 18(4), 408, 2001
- Yamamoto T, Takaki K, Koyama T, Furukawa K, Bioresour. Technol., 99(14), 6419, 2008
- Zhu G, Peng Y, Li B, Guo J, Yang Q, Wang S, Rev. Environ.Contam. Toxicol., 192(4), 159, 2008
- Choi ES, Lee HS, Korean J. Chem. Eng., 13(4), 364, 1996
- Turk O, Mavinic D, Water Res., 23, 1383, 2004
- Tokutomi T, Water Sci. Technol., 49(11), 81, 2004
- Van Kempen R, Mulder J, Uijterlinde C, Loosdrecht M, Water Sci. Technol., 44, 145, 2001
- Blackburne R, Yuan Z, Keller J, Water Res., 42(6), 2166, 2008
- Aslan S, Miller L, Dahab M, Bioresour. Technol., 100(2), 659, 2009
- Yuan Z, Oehmen Z, Peng Y, Ma Y, Keller J, Environ. Sci. Biotechnol., 7(8), 243, 2008
- Blackburne R, Yuan Z, J. Biodegradation., 19, 303, 2008
- Wang J, Yang N, Process Biochem., 39, 1223, 2004
- Kim DJ, Ahn DH, Lee DI, Korean J. Chem. Eng., 22(1), 85, 2005
- Yang Q, Peng Y, Liu X, Zeng W, Mino T, Satoh H, Environ.Sci. Technol., 41(7), 8159, 2007
- Peng YZ, Zhu GB, Appl. Microbiol. Biotechnol., 73(1), 15, 2006
- Bae W, Baek S, Chung Y, J. Biodegradation., 12, 359, 2001
- Ciudad G, Rubilar O, Munoz P, Ruiz G, Chamy L, Vergara C, Jeison D, Process Biochem., 40, 1715, 2005
- Chinese SEPA, Water and wastewater monitoring methods, 4th Ed., Chinese Environmental Science Publishing House, Beijing, China, 2002
- APHA, Standard methods for the examination of water and wastewater, 20ed, American Public Health Association, American Water Works Association and Water Environment Federation, Washington, DC, USA, 1998
- Rowe R, Waide TR, Appl. Environ. Microbiol., 33, 675, 1977
- Aanbroek L, Pfennig HJ, Arch Microbiological., 128, 330, 1989
- Alexander M, Clark FE, Nitrifying bacteria, In: Black CA, Ed. Methods of soil analysis, Part 2. Madison, WI: 1965; American Society of Agronomy, 1477
- Garrido JM, Vanbenthum WA, Vanloosdrecht MC, Heijnen JJ, Biotechnol. Bioeng., 53(2), 168, 1997
- Yuan Z, Blackall L, Water Res., 36, 482, 2001
- Day M, Cooper P, Guide on nutrient removal processes, Report FR 0253, Foundation for water Research, Marlow, Bucks, UK, June, 1992
- Ma Y, Peng Y, Wang S, Yuan Z, Water Res. J., 43, 563, 2009
- Casey T, Wentzel M, Ekama G, Loewenthal R, Marais GR, Water Sci. Technol., 29(7), 203, 1994
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