Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy...
Reexamination Certificate
2006-01-31
2006-01-31
Gitomer, Ralph (Department: 1655)
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
C435S244000
Reexamination Certificate
active
06991931
ABSTRACT:
A method has been developed to maintain the health of an activated sludge environment in a wastewater process comprising monitoring the levels of polyhydroxyalkanoates (PHA) produced as an indicator of bioreactor health and regulating the concentration of feed nutrients and nitrate to maintain bioreactor health. In general, levels of PHA in excess of about 15% to about 20% dry weight of the biomass is an indication that the biocatalytic efficiency of the wastewater treatment process is impaired.
REFERENCES:
patent: 5466604 (1995-11-01), Maneshin et al.
patent: 5833856 (1998-11-01), Liu et al.
patent: 6699707 (2004-03-01), Hince
patent: 6737263 (2004-05-01), Dragotta et al.
patent: 2003/0170654 (2003-09-01), Crocetti et al.
patent: WO 0052189 (2000-09-01), None
Beun, J. J., V. Verhoef, V. L. M.C.M. and H. J.J. 2000. Stoichiometry and kinetics of PHB metabolism under denitrifying conditions in activated sludge cultures. Biotech and Bioeng vol. 68: pp. 496-507.
Bond, P. L. et al., 1999, Microbiological aspects of phosphorus removal in activated sludge systems. Microbiol. Act. Sludge 227-256: 354-409.
Byrom, D., 1994, Polyhydroxyalkanoates. Plastics from Microbes. D. Mobley. New York, Hanser Publishers: 5-33.
Constantin, H. and M. Fick 1997. Influence of C-Sources on the Denitrification rate of a High Nitrate c oncentrated Industrial Wastewater. Water Research 31: 583-589.
Dawes, E. A. and P. J. Senior 1973. The role and regulation of energy reserve polymers in micro-orgamisms. Adv. Microb. Physiol. 10: 135-266.
Satoh et al, 1999. PHA production by activated sludge. Int. J. Biol. Macromol. 25: 105-109.
Isaacs. S, T. Mah and S. K. Maneshin 1998. Automatic Monitoring of Denitrification Rates and Capacities in Activated Sludge Processes using Fluorescence or Redox Potential. Water Science and Technology 37: 121-129.
Lee, S. Y. and J.-I. Choi 1999. Production and degradation of polyhydroxyalkanoates in waste environment. Waste Management 19: 133-139.
Louie. T. M., T. J> Mah, W. Oldham and W. D. Ramey 2000. Use of metabolic inhibitors and gas chromotography/mass spectrometry to study poly-B-hydroxyalkanoates metabolism involving cryptic nutrients in enhanced biological phosphorous removal systems. Water Res. 34: 1507-1514.
Riis, X and X. Mai 1988. Gas Chromatographic Determination of Poly-B-hydroxybutyric acid in Microbial Biomass after Hydroxhloric acid Propanolysis. Journal of Chromatography 445: 285-288.
Steinbuechel, A., et al., 1992, Molecular basis for biosynthesis and accumulation of polyhydroxyalkanoic acids in bacteria. FEMS Microbiol. Rev. 103: 217-230.
Thomsen, J. K., T. Geesi and R. P. Cox 1994. Mass spectrometric studies of the effect pH on the accumulation of intermediates in denitrification of Paracoccus denitrificans. Applied Environmental Microbiology 60: 536-541.
Dragotta Dominic A.
Nagarajan Vasantha
Thomas Stuart M.
E. I. du Pont de Nemours and Company
Gitomer Ralph
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