Solution

and:

The sludge age follows from: KS + S

(2) The reactor volume V follows from the substrate balance:

Pmax S

Pmax SX

(3) Comparison with the results from Problem 6.1:

Problem 6.1: tRX — 0.833 d, S — 25 mg L-1 COD and V — 709 m3 excess sludge: 1702 kg d-1 MLSS

Problem 6.2: tRX — 4.217 d, S — 7.14 mg L-1 COD and V — 2208 m3 excess sludge: 1065 kg d-1 MLSS

References

Arden, E.; Locket, W.T. 1914, Experiments on the oxidation of sewage without the aid of filters, J. Soc. Chem. Ind. 35, 523-539.

Benedek, P.; Horvath, I. 1967, A practical approach to activated sludge kinetics, Water Res. 1, 663.

Benefield, L.D.; Randall, C.W. 1980, Biological Process Design For Wastewater Treatment, Prentice-Hall, Englewood Cliffs, N.J.

Button, D.K.; Gurver, J.C. 1966, Continuous culture of Torulopsis utilis: a kinetic study of oxygen limited growth, J. Gen. Microbiol. 45, 195.

Chen, Y.R.; Hashimoto, A.G. 1980, Substrate utilization kinetic model for biological treatment processes, Biotechnol. Bioeng. 22, 2081-2095.

Chow, V.T.; Eliassan, R.; Linsley, R.K. 1979, Wastewater Engineering, McGraw-Hill, New York.

Danckwerths, P.V. 1955, Continuous flow systems, distribution of residence times, Chem. Eng. Sci. 2.1

Eckenfelder, W.W. 1967, Comparative biological waste treatment design, J. Sanit. Eng. Div. S.A. 6, 157-170.

Fan, L.T. 1970, Effect of axial dispersion on the optimal design of the activated sludge process, Water Res. 4, 271.

Fan, L.T.; Erickson, L.E.; Shah, P.S.; Tsai, B.I. 1970, Effect of mixing on the washout and steady state performance of continuous cultures, Biotechnol. Bioeng. 12, 1019-1068.

Froment, G.F.; Bischoff, K.B. 1979, Chemical Reactor Analysis And Design, John Wiley & Sons, New York.

Grady, C.P.; Daigger, G.T.; Lim, H.C. 1999, Biological Wastewater Treatment, Marcel Dekker, New York.

Henze, M.; Harremoes, P.; Jansen, J.C.; Arvin, E. 2002, Wastewater Treatment, Springer Verlag, Berlin.

Herbert, D. 1958, Some principles of continuous culture, in: Recent Progress in Microbiology, ed. G. Tunevall, Blackwell Scientific, Oxford.

Hill, C.G. 1977, An Introduction To Chemical Enginering Kinetics And Reactor Design, John Wiley & Sons, New York.

Lawrence, A.W.; McCarty, P.L. 1970, Unified basis for biological treatment design and operation, J. Sanit. Eng. Div. S.A. 3, 767-778.

Leistner, G.; Müller, G.; Sell, G.; Bauer, A. 1979, Der Bio-Hochreaktor - eine biologische Abwasserreinigungsanlage in Hochbauweise, Chem. Ing. Tech. 51, 288

Levenspiel, O. 1962, Chemical Reaction

Engineering, John Wiley & Sons, New York.

Levenspiel, O. 1979, The Cemical Reaction, Omnibook, OSU Book Stores, Inc., Corvallis, Oregon, USA.

Lin, S.H. 1979, Axial dispersion in post-aeration basins, J. W.P.C.F. 51, 985-990.

Mehring, A. 1979, Zur Berechnung des Belebtschlammreaktors als ein- und mehrstufiges Mischbecken unter Berücksichtigung der Sauerstoffbilanz, PhD thesis, TU Berlin.

Metcalf and Eddy 1979, reviewed by G. Tchobanoglous: Wastewater Engineering: Treatment, Disposal, Reuse, McGraw-Hill, New York.

Monod, J. 1942, Recherches sur la croissance de cultures bactériennes. In: Actualités Scientifique et Industrielles 911 Microbiologie, Herrmann & Cie, Paris.

Monod, J. 1950, La technique of Culture Continue: Theorie et Applications, Ann. Inst. Pasteur 79, 390-410.

Nazaroff, W.W.; Alvarez-Cohen, L. 2001, Environmental Engineering Science, John Wiley & Sons, New York.

Peil, K.M.; Gaudy Jr., A.F. 1971, Kinetic constants for aerobic growth of microbial populations selected with various single compounds and with municipal wastes as substrates, Appl. Microbiol. 21, 253.

Pippel, W. 1978, Verweilzeitanalyse in technologischen Strömungssystemen, Akademie-Verlag, Berlin.

Pirt, S.J. 1965, The maintenance energy of bacteria in growing cultures, Proc. R. Soc. Lond. B 163, 224.

Putnaerglis, A. 1987, Einfluss der Sauerstoffkonzentration und der Stufenzahl auf den aeroben Substratabbau in Belebtschlammreaktor-Kaskaden - Kinetik und reaktionstechnische Modellierung, VDI-Forschungs-berichte, Reihe 15, 49.

Reynolds, T.D.; Yang, J.T. 1966, Model of the completely mixed activated sludge process, Proc. Ind. Waste Conf. 21, 696.

Sinclair, C.G.; Ryder, D.N. 1972, Model for the growth of aerobic microorganisms under oxygen limiting conditions, Biotechnol. Bioeng. 14, 787.

Strnivasaraghanan, R.; Gaudy Jr., A.F. 1974, Operational performance of an activated sludge process with constant sludge feedback, Proc. Ind. Waste Conf. 24, 197.

Sundstrom, D.W.; Klei, H.E. 1979, Wastewater Treatment, Prentice-Hall, Englewood Cliff, N.J.

Mathematical models of biological waste treatment processes for the design of aeration tanks, Water Res. 12, 491-501.

Wen, C.Y., Fan, L.T. 1975, Models for Flow Systems and Chemical Reactors, Marcel Dekker, Inc., New York.

Winkler, M.A. 1981, Microbial Treatment of Wastewater, Ellis Horwood, Chichester.

0 0

Post a comment