Determining the Volatile Fatty Acid Equivalent in Thermophilic Aerobically Digested Sludge Supernatant
Publication: Journal of Environmental Engineering
Volume 130, Issue 4
Abstract
Thermophilic aerobically digested (TAD) sludge supernatant has been found to be a potential carbon alternative for biological nutrient removal (BNR) enhancement in wastewater treatment plants. Carbonaceous substrates, other than the volatile fatty acids (VFAs) in TAD supernatant, were also found to be utilizable in BNR enhancement; however, these carbon compounds could not be detected by conventional chemical analyses (e.g., gas chromatography). A headspace carbon dioxide monitoring method was tested in this study to estimate the overall available carbon source, or the VFAs accumulated in a microaerated TAD operation. This on-line method uses real activated sludge and TAD supernatant samples to determine the available carbon equivalent in real time. In comparison to the gas chromatography (GC) analyses of the TAD supernatant samples, the headspace monitoring method resulted in “overestimation” of VFA concentrations, in both the phosphorus release and denitrification reactions. Operating results suggested that the monitoring approach was capable of revealing the overall VFA equivalent that could be available for the main BNR reactions.
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References
American Public Health Association (APHA), American Water Works Association (AWWA), and Water Pollution Control Federation (WPCF). (1989). Standard methods for the examination of water and wastewater 17th edition, Washington, D.C.
Armiger, W. B., Lee, G. J., Schwegler, Jr., B. R., and Mah, T. J.(1993). “Control of BNR processes by regulation of the VFA/M ratio.” Water Sci. Technol., 28(11–12), 303–314.
Barker, P. S., and Dold, P. L.(1996). “Denitrification behaviour in biological excess phosphorus removal activated sludge system.” Water Sci. Technol., 30(4), 769–780.
Barlindhaug, J., and Ødegaard, H.(1996). “Thermal hydrolysate as a carbon source for denitrification.” Water Sci. Technol., 33(12), 99–108.
Boulanger, M. L. (1995). “The effect of varying air supply upon supernatant quality in autoheated thermophilic aerobic digesters treating waste sludge from a biological phosphorus removal process.” Master’s thesis, University of British Columbia, Vancouver B.C., Canada.
Buchauer, K.(1998). “A comparison of two titration procedures to determine volatile fatty acids in influents to waste-water and sludge treatment processes.” Water SA, 24(1), 49–56.
Chu, A. (1995). “Volatile fatty acid metabolism in thermophilic aerobic digestion of sludge.” PhD thesis, University of British Columbia, Vancouver B.C., Canada.
Chu, A., Mavinic, D. S., Kelly, H. G., and Ramey, W. D.(1994). “Volatile fatty acid production in thermophilic aerobic digestion of sludge.” Water Res., 28(7), 1513–1522.
Comeau, Y. (1988). “The role of carbon storage in biological phosphate removal from wastewater.” PhD thesis, University of British Columbia, Vancouver B.C., Canada.
Ekama, G. A., Dold, P. L., and Marais, G. V. R.(1986). “Procedures for determining influent COD fraction and the maximum specific growth rate of heterotrophs in activated sludge system.” Water Sci. Technol., 18, 91–114.
de Haas, D., and Adam, N.(1995). “Use of a simple titration procedure to determine alkalinity and volatile fatty acids for process control in wastewater treatment.” Water SA, 21(4), 307–318.
Henze, M., Gujer, W., Mino, T., Matsuo, T., Wentzel, M. C., and Marais, G. V. R.(1995). “Wastewater and biomass characterization for the activated sludge model No. 2: Biological phosphorus removal.” Water Sci. Technol., 31(2), 13–23.
Jørgensen, P. E., Eriksen, T., and Jensen, B. K.(1992). “Estimation of viable biomass in wastewater and activated sludge by determination of ATP, oxygen utilization rate and FDA hydrolysis.” Water Res., 26(11), 1495–1502.
Ju, L. K., Yang, X., Lee, J. F., and Armiger, W. B.(1995). “Monitoring of the biological nutrient removal process by an on-line NAD(P)H fluorometer.” Biotechnol. Prog., 11(5), 545–551.
Koch, F. A., and Oldham, W. K.(1985). “Oxidation-reduction potential—A tool for monitoring, control, and optimization of nutrient removal systems.” Water Sci. Technol., 17(1), 259–281.
Kristensen, G. H., Jørgensen, P. E., and Henze, M.(1992). “Characterization of functional microorganism groups and substrate in activated sludge and wastewater by AUR, NUR and OUR.” Water Sci. Technol., 25(6), 43–57.
Larose, A., Perrier, M., and Comeau, Y.(1997). “Respirometric control of the anaerobic period duration of an SBR bio-P process.” Water Sci. Technol., 36(5), 293–300.
Li, J. Z. (2001). “Recovering biodegradable carbon from a thermophilic aerobic digestion supernatant for biological nutrient removal.” PhD thesis, University of British Columbia, Vancouver B.C., Canada.
Li, J. Z., Mavinic, D. S., and Kelly, H. G.(2002a). “Using headspace gas monitoring to determine available carbon source in a BNR process.” J. Environ. Eng. Sci., 1(2), 89–100.
Li, J. Z., Mavinic, D. S., and Kelly, H. G.(2002b). “Comparison of Batch and Continuous Feeding of Thermophilic Aerobically Digested Sludge Supernatant as a Carbon Source for Biological Nutrient Removal.” J. Environ. Eng. Sci., 1(3), 213–224.
Lie, E., and Welander, T.(1997). “A method for determination of the readily fermentable organic fraction in municipal wastewater.” Water Res., 31(6), 1269–1274.
Louie, T. M., Mah, T. J., Oldham, W., and Ramey, W. D.(2000). “Use of metabolic inhibitors and gas chromatography/mass spectrometry to study poly-β-hydroxyalkanoates metabolism involving cryptic nutrients in enhanced biological phosphorus removal systems.” Water Res., 34(5), 1507–1514.
Majone, M., Massanisso, M. P., and Ramadori, R.(1998). “Comparison of carbon storage under aerobic and anoxic conditions.” Water Sci. Technol., 38(8–9), 77–84.
Mamais, D., Jenkins, D., and Pitt, P.(1993). “A rapid physical-chemical method for the determination of readily biodegradable soluble COD in municipal wastewater.” Water Res., 27(1), 195–197.
Mason, C. A., Hamer, G., Fleischmann, T. H., and Lang, C.(1987). “Bioparticulate solubilization and biodegradation in semi-continuous aerobic thermophilic digestion.” Water, Air, Soil Pollut., 34, 399–407.
Mavinic, D. S., Mahendraker, V., Sharma, A., and Kelly, H. G.(2001). “Effect of microaerophilic conditions on autothermal thermophilic aerobic digestion process.” J. Environ. Eng., 127(4), 311–316.
McIntosh, K. B., and Oleszkiewicz, J. A.(1997). “Volatile fatty acid production in aerobic thermophilic pre-treatment of primary sludge.” Water Sci. Technol., 36(11), 189–196.
Mohan, S. V., Mohan, S. K., and Erddy, S. J.(2000). “Determination of organic matter in water using organo-metal complexes.” Water Res., 34(15), 3761–3764.
Morsi, B. I., and Charpentier, J. C. (1981). “Review of obtaining and estimation methods of physicochemical and related data: Part 2 gas-liquid mass transfer parameters.” Mass transfer with chemical reaction in multiphase systems volume I: Two-phase systems, Martinus Nijhoff, Hague, The Netherlands, 101–188.
Münch, E. v., and Greenfield, P. F.(1998). “Estimating VFA concentration in perfermenters by measuring pH.” Water Res., 32(8), 2431–2441.
Prendl, L., and Kroiß, H.(1998). “Bulking sludge prevention by an aerobic selector.” Water Sci. Technol., 38(8–9), 19–27.
Royce, P. N. C., and Thornhill, N. F.(1991). “Estimation of dissolved carbon dioxide concentration in aerobic fermentation.” J. Am. Inst. Chem. Eng., 37(11), 1680–1686.
Satoh, H., Ramey, W. D., Koch, F. A., Oldham, W. K., Mino, T., and Matsuo, T.(1996). “Anaerobic substrate uptake by the enhanced biological phosphorus removal activated sludge treating real sewage.” Water Sci. Technol., 34(1–2), 9–16.
Urbain, V., Naidoo, V., and Buckley, C. (1998). “Municipal wastewater characterization using biological and physicochemical methods.” Proc., WEFTEC Asia’98 Volume I, Singapore, 319–325.
Wentzel, M. C., Ekama, G. A., and Mararis, G. V. R.(1992). “Process and modeling of nitrification denitrification biological excess phosphorus removal systems—A review.” Water Sci. Technol., 25(6), 59–82.
Wesselingh, J. A., and Krishna, R. (1990). Mass transfer, Ellis Horwood, New York.
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Copyright © 2004 American Society of Civil Engineers.
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Received: Mar 27, 2002
Accepted: Apr 9, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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