Our paper analyzes the quality of combined wastewater in the aspect of its biological treatment. Fractions of chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) in the inflow to the Group Wastewater Treatment Plant in Łódź were determined. The research revealed a distinct increase of inert fractions during wet weather caused by an increasing portion of contaminants bound with suspended solids.
2. HENZE M., GUJER W., MINO T., VAN LOOSDRECHT M. Activated Sludge Models ASM1, ASM2, ASM2d and ASM3. Edited by IWA Task Group on Mathematical Modelling for Design and Operation of Biological Wastewater Treatment. IWA Scientific and Technical Reports. No. 9. IWA London, 2000.
3. SZETELA R.W. Dynamic model of activated sludge wastewater treatment plant. Prace Naukowe Instytutu Inżynierii Ochrony Środowiska Politechniki Wrocławskiej. 64, 32, Wrocław, 1990 [In Polish].
4. ORHON D., ATEŞ E., SÖZEN S., ÇOKGÖR E. U. Characterization and COD fractionation of domestic wastewaters. Environmental Pollution. 95, (2), 191, 1997.
5. MIKSCH K. Biotechnology of wastewater. Skrypty Uczelniane nr 2205, Politechnika Śląska, 2000 [In Polish].
6. FERRER J., MORENILLA J.J., BOUZAS A., GARCIAUSACH F. Calibration and simulation of two large wastewater treatment plants operated for nutrient removal. Wat. Sci. Tech. 50, (6), 87, 2002.
7. GÖKÇAY F.C., SIN G. Modeling of a large scale wastewater treatment plant for efficient operation. Wat.Sci.Tech. 50, (7), 123, 2004.
8. WEIJERS S. On BOD tests for the determination of biodegradable COD for calibrating Activated Sludge Model No.1. Wat. Sci. Tech. 39(4), 177, 1999.
9. ROELEVELD P.J., VAN LOOSDRECHT M.C.M. Experience with guidelines for wastewater characterization in The Netherlands. Wat. Sci. Tech. 45(6), 77, 2002.
11. MAMAIS D., JENKINS D., PITT P. A rapid physical-chemical method for the determination of readily biodegradable soluble COD in municipal wastewater. Wat. Sci. Tech. 27, 195, 1993.
12. ZIGLIO G., ANDREOTTOLA G., FOLADORI, RAGAZZI M. Experimental validation of a single-OUR method for wastewater RBCOD characterisation. Wat. Sci. Tech. 43, (11), 119, 2001.
13. MYSZOGRAJ S., SADECKA Z. COD fractions in mechanical-biological wastewater treatment on the basis of the sewage treatment plan of Sulechów. Rocznik Ochrona Środowiska, Koszalin. 6, 233, 2004 [In Polish].
14. WISCONSIN DEPT. OF NAT. RES., Wastewater Characterization for Evaluation of Biological Phosphorus Removal. Wastewater Fractionation. http://dnr.wi.gov/
15. ROSSLE W.H., PRETORIUS W.A. A review of characterization for on-line prefermenters. Paper 1: Wastewater characterisation. Water S.A. 27, (3), 405, 2001.
16. KAPPELER J., GUJER W. Estimation of kinetic parameters of heterotrophic biomass under aerobic conditions and characterization of wastewater for activated sludge modeling. Wat.Sci.Tech. 25, (6), 125, 1992.
17. CARUCCI A., KUHNI M, BRUN R., CARUCCI G., KOCH G., MAJONE M., SIEGRIST H. Microbial competition for the organic substrates and its impact on EBPR systems under conditions of changing carbon feed. Wat. Sci. Tech. 39, (1), 75, 1999.
18. KALINOWSKA E., OLESZKIEWICZ J. From the designing to the maintenance of wastewater treatment plant. Optimization using simulation and modelling. Międzynar. Semin. Szkol., LEMtech Konsulting, Warszawa, 2001 [In Polish].
19. BECK C., LE ROY K., SADOWSKI A.G. A coupled sewer system and WWTP modelling approach to minimise annual discharge: a case study. Proc. of the 10th International Conference on Urban Drainage, Copenhagen/Denmark, 21-26 August 2005. a CD-ROM edition, 2005.
20. TAYLOR G.D., FLETCHER T.D., WONG T.H., BREEN P.F., DUNCAN H.P. Nitrogen composition in urban runoffimplications for stormwater management. Water Research. 39, (10), 1982, 2005.