DEACTIVATION AND REJUVENATION OF PHOSPHORUS ACCUMULATING ORGANISMS IN THE PARALLEL AN/AO PROCESS - Biochemical Engineering - page 318

external sludge return ratio also influenced PAO activity in the parallel AN/AO process and
were linked to factors that influenced PAO activity in anaerobic-anoxic SBR reactors.
SRT as long as 30d and HRT as long as 18h triggered PAO deactivation in the parallel
AN/AO process, which could be rejuvenated by adjusting SRT and HRT to 15d and 9h
respectively. By controlling DOC concentration at the beginning of anoxic stages and NO 3 - -N
concentration at the beginning of anaerobic stages lower than 3 mgL-1 and 2.3 mgL-1
respectively could rejuvenate deactivated PAO in the anaerobic-anoxic SBR reactors.
Acknowledgements
This study was financially co-supported by New Century Educational Talent Program
(NCET-05-0387, Commission of China Education Ministry) and High School Fund for
Doctors(No.20050247016).
References
A., Ochmen, M.T., Vives, H.B., Lu, Z.G., Yuan, J., Keller , 2005. The effect of pH on the
competition between polyphosphateaccumulating organisms and glycogen-accumulating
organisms. Water Res. 39 , 3727-3737.
American Public Health Association (APHA), American Water Works Association
(AWWA), Water Environment Federation (WEFW) , 1998. Standard Methods for the
Examination of Water and Wastewater, 20th edition. Washington, DC.
A., Akar, E.U., Akkaya, S. Koray, Yesiladali, G.C., E.U., Cokgor, C.T., Derin, Orhon, Z., P.,
Cakar , 2006. Accumulation of polyhydroxyalkanoates by microlunatus phosphovorus
under various growth conditions . J. Ind. Microbial Biotechnol. 33 , 215-220.
Beatons, D., Vanrolleghem, P.A., van Loosdrecht, M.C.M., Hosten, L.H., 1999. Temperature
effects in bio-P removal. Wat. Sci. Tech. 39 (1), 215-225.
Carsson, H., Aspegren, H., Lee, N., Hilmer, A., 1997. Calcium phosphorus precipitation in
biological phosphorus removal systems. Water Res. 31 (5), 1047-1055.
Cech, J.S., Hartman, P., 1993. Competition between polyphosphate and polysaccharide
accumulating bacteria in enhanced biological phosphorus removal systems. Water Res.
27 , 1219-1225.
Csiti, A., 1991. Factors affecting the biological phosphorus removal efficiency. Periodica
Polytechnica Ser. Civil Eng. 35 (1-2), 97-106.
J., Meinhold, Carlos, D.M. Filipe, G., T., Daigger, 1999. Characterization of the denitrifying
fraction of phosphate accumulating organisms in biological phosphate removal. Wat. Sci.
Tech. 39 (1), 31-42.
J., Meinhold, H., Pedersen, E., Arnold, 1998. Effect of continuous addition of an organic
substrate to the anoxic phase on biological phosphorus removal. Wat. Sci. Tech. 38 (1),
97-105.
J., Ahn, Tomotaka D., Satoshi T., 2002. Transformation of phosphorus and relevant
intracellular compounds by a phosphorus-accumulating enrichment culture in the
presence of both the electron acceptor and electron donor. Biotechnology and
Bioengineering. 79 (1), 84-92.