Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2007-08-01
2010-02-02
Barry, Chester T (Department: 1797)
Liquid purification or separation
Processes
Treatment by living organism
Reexamination Certificate
active
07655143
ABSTRACT:
A method of stimulating nitrification at low SRT by elevating pCO2during aeration is disclosed. The improvement on solids settling performance when elevated pCO2was supplied after 2 hours within the React cycle is consistent with the previous results that identified inorganic carbon as a potential remedy to poor settling and bulking sludge problems in activated sludge systems. Elevated pCO2increases the concentration of carbon dioxide and lowers the pH, which improve nitrification. The specific growth rate of nitrifying bacteria is sensitive to pCO2, pH, and dissolved oxygen (DO). The DO is a function of the aeration rate. Elevating the pCO2and lowering the aeration rate provides conditions for nitrification rates that are comparable to conventional systems. However, the lower aeration rate yields significant energy cost savings.
REFERENCES:
patent: 4818407 (1989-04-01), Bogusch
patent: 5019266 (1991-05-01), Soeder et al.
patent: 5514264 (1996-05-01), Shane
patent: 5656059 (1997-08-01), Monster et al.
patent: 5849192 (1998-12-01), Jagush et al.
patent: 6159371 (2000-12-01), Dufay
patent: 6241897 (2001-06-01), Hanson et al.
patent: 6372137 (2002-04-01), Bounds
patent: 6569334 (2003-05-01), Yoneda
patent: 6893567 (2005-05-01), Vanotti et al.
patent: 7014763 (2006-03-01), Johnson et al.
patent: 2008/0006587 (2008-01-01), Cumming et al.
patent: 2008/0164196 (2008-07-01), Sumino et al.
Denecke, “Effect of carbon dioxide on nitrification rates,” Bioprocess Biosyst Eng,. Jan. 2003;25(4):249-53. Epub Nov. 26, 2002), http://www.ncbi.nlm.nih.gov/pubmed/14505004.
Wett, B., and Rauch, W. (2003). “The role of inorganic carbon limitation in biological nitrogen removal of extremely ammonia concentrated wastewater.” Water Res, 37(5), 1100-10.
Wett, B., Eladawy, A., and Becker, W. (2003). “Carbonate addition—an effective remedy against poor activated sludge settling properties and alkalinity conditions in small wastewater treatment plants.” Water Sci Technol, 48 (11-12), 411-7.
Byong-Hee, J., Yasunori, T., and Hajime, U. (2000). “Stimulating Accumulation of Nitrifying Bacteria in Porous Carrier by Addition of Inorganic Carbon in a Continuous-Flow Fluidized Bed Wastewater Treatment Reactor.” J. Biosci Bioeng, 89(4), 334-39.
Melcer, H., P.L. Dold, R.M. Jones, C.M. Byue, I. Takacs, H.D. Stensel, A.W. Wilsoon, P. Sun, and S. Bury “Methods for Wastewater Characterization in Activated Sludge Modeling.” Water Environment Research Foundation (2003), Report # 99-WWF-3.
Dagley, S., and Hinshelwood, C. N. (1938). “Physicochemical Aspects of bacterial Growth. Part II. Quantitative dependence of the Growth Rate of Bact. Lactis aerogenes on the Carbon Dioxide Content of the Gas Atmosphere.” J. Chem. Soc.
Davoli, D., Madoni, P., Guglielmi, L., Pergetti, M., and Barilli, S. (2002). “Testing the effect of selectors in the control of bulking and foaming in full scale activated-sludge plants.” Water Sci Technol, 46(1-2), 495-8.
Denecke, M., and Liebig, T. (2003). “Effect of carbon dioxide on nitrification rates.” Bioprocess Biosyst Eng, 25(4), 249-53.
Gordon, L., and Paskins, A. (1982). “Influence of High Partial Pressure of Carbon Dioxide and/or Oxygen on Nitrification.” J. Chem Tech, 32, 213-23.
Green, M., Ruskol, Y., Shaviv, A., and Tarre, S. (2002). “The effect of CO2 concentration on a nitrifying chalk reactor.” Water Res, 36(8), 2147-51.
Jetten, M. S., Cirpus, I., Kartal, B., Van Niftrik, L., Van De Pas-Schoonen, K. T., Sliekers, O., Haaijer, S., Van Der Star, W., Schmid, M., Van De Vossenberg, J., Schmidt, I., Harhangi, H., Van Loosdrecht, M., Gijs Kuenen, J., Op Den Camp, H., and Strous, M. (2005). “1994-2004: 10 years of research on the anaerobic oxidation of ammonium.” Biochem Soc Trans, 33(Pt 1), 119-23.
Jirka, A. M., and Carter, M. J. (1975). “Micro semi-automated analysis of surface and wastewaters for chemical oxygen demand.” Anal Chem, 47(8), 1397-1402.
Kinsbursky, R. S., and Saltzman, S. (1990). “CO2-Nitrification Relationships in Closed Soil Incubation Vessels.” Soil Biol Biochem, 22(4), 571-572.
Metcalf & Eddy, I. (2003). Wastewater Engineering: Treatment and Reuse., McGraw-Hill, New York, NY.
Mobarry, B. K., Wagner, M., Urbain, V., Rittmann, B. E., and Stahl, D. A. (1996). “Phylogenetic probes for analyzing abundance and spatial organization of nitrifying bacteria.” Appl Environ Microbiol, 62(6), 2156-62.
Nielsen, P. H., De Muro, M. A., and Nielsen, J. L. (2000). “Studies on the in situ physiology of Thiothrix spp. present in activated sludge.” Environ Microbiol, 2(4), 389-98.
Noutsopoulos, C., Mamais, D., and Andreadakis, A. D. (2002). “The effect of reactor configuration and operational mode onMicrothrix parvicellabulking and foaming in nutrient removal activated sludge systems.” Water Sci Technol, 46(1-2), 61-4.
Odintsova, E. V., Wood, A. P., and Kelly, D. P. (1993). “Chemolithoautotrophic growth ofThiothrix ramosa.” Arch Microbiol, 160, 152-7.
Pitt, P., and Jenkins, D. (1990). “Causes and control of Nocardia in activated sludge.” Res. J. Water Polln. Control. Fedn., 37(2), 151-62.
Sakairi, M. A., Yasuda, K., and Matsumura, M. (1996). “Nitrogen removal in seawater using nitrifying and denitrifying bacteria immobilized in porous cellulose carrier.” Water Science and Technology, 34(7-8), 267-274.
Van Loosdrecht, M. C. M., Brandse, F. A., and De Vries, A. C. (1998). “Upgrading of Wastewater Treatment Processes for Integrated Nutrient Removal—The BCFS® Process.” Wat Sci Tech., 37(9), 209-217.
Wagner, M., Rath, G., Koops, H. R, Flood, J., and Amann, R. (1996). “In situ analysis of nitrifying bacteria in sewage treatment plants.” Water Science and Technology, 34(1-2), 237-244.
Morris Raymond A.
Posso-Blandon Lina
Stroot Peter G.
Barry Chester T
Smith & Hopen , P.A.
Toner Thomas E.
University of South Florida
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