1. D. Orhon, S. Sözen, E. Ubay, Assessment of nitrificationdenitrification potential of Istanbul domestic wastewaters. Water Sci. Technol., 30 (1994) 21–30.
  2. D. Okutman Tas, Ö. Karahan, G. Insel, S. Övez, D. Orhon, H. Spanjers, Biodegradability and denitrification potential of settleable chemical oxygen demand in domestic wastewater, Water Environ. Res., 81 (2009) 715–727.
  3. O. Tünay, I. Kabdasli, D. Orhon, E. Ates, Characterization and pollution profile of leather tanning industry in Turkey, Water Sci. Technol., 32 (1995) 1–9.
  4. A. Cassano, R. Molinari, M. Romano, E. Drioli, Treatment of aqueous effluents of the leather industry by membrane processes: a review, J. Membr. Sci., 181 (2001) 111–126.
  5. G. Lofrano, V. Belgiorno, M. Gallo, A. Raimo, S. Meric, Toxicity reduction in leather tanning wastewater by improved coagulation flocculation process, Global NEST J., 8 (2006) 151–158.
  6. I. Kabdaslı, O. Tünay, I. Öztürk, S. Yılmaz, O. Arıkan, Ammonia removal from young landfill leachate by magnesium ammonium phosphate precipitation and air stripping, Water Sci. Technol., 41 (2000) 237–240.
  7. O. Tünay, D. Orhon, I. Kabdasli, Pretreatment requirements for leather tanning industry wastewaters, Water Sci. Technol., 29 (1994) 121–128.
  8. D. Orhon, S. Sözen, E.U. Çokgör, E.A. Genceli, The effect of chemical settling on the kinetics and design of activated sludge for tannery wastewaters, Water Sci. Technol., 38 (1998) 355–362.
  9. Z.B. Gao, C.Y. Su, The Treatment of Wastewater from Tannery Industry, Chemistry Industry Press, Beijing, 2000.
  10. G. Lofrano, S. Meriç, G.E. Zengin, D. Orhon, Chemical and biological treatment technologies for leather tannery chemicals and wastewaters: a review, Sci. Total Environ., 461 (2013) 265–281.
  11. D. Orhon, E.A. Genceli, E.U. Çokgör, Characterization and modeling of activated sludge for tannery wastewater, Water Environ. Res., 71 (1999) 50–63.
  12. S.M. Hocaoğlu, G. Insel, N. Artan, D. Orhon, Performance evaluation of SBR treatment for nitrogen removal from tannery wastewater, Water Sci. Technol., 53 (2006) 275–284.
  13. R. Ganesh, G. Balaji, R.A. Ramanujam, Biodegradation of tannery wastewater using sequencing batch reactor—respirometric assessment, Bioresour. Technol., 97 (2006) 1815–1821.
  14. C.E. Scruggs, C.W. Randall, Evaluation of filamentous microorganism growth factors in an industrial wastewater activated sludge system, Water Sci. Technol., 37 (1998) 263–270.
  15. K. Andreasen, P.H. Nielsen, Growth of Microthrix parvicella in nutrient removal activated sludge plants: studies of in situ physiology, Water Res., 34 (2000) 1559–1569.
  16. S. Övez, D. Orhon, Microbial ecology of bulking and foaming activated sludge treating tannery wastewater, J. Environ. Sci. Health, 40 (2005) 409–422.
  17. D. Orhon, S. Sözen, Reshaping the activated sludge process: has the time come or passed?, J. Chem. Technol. Biotechnol., 95 (2020) 1632–1639.
  18. S.M. Hocaoglu, E. Atasoy, A. Baban, D. Orhon, Modeling biodegradation characteristics of grey water in membrane bioreactor, J. Membr. Sci., 429 (2013) 139–146.
  19. G. Crawford, D. Thompson, J. Lozier, G. Daigger, E. Fleischer, Membrane bioreactor2014s-a designer’s perspective, Proc. Water Environ. Fed., 2000 (2000) 311–319.
  20. P. Le-Clech, V. Chen, T.A. Fane, Fouling in membrane bioreactors used in wastewater treatment, J. Membr. Sci., 284 (2006) 17–53.
  21. D. Orhon, Evolution of the activated sludge process: the first 50 years, J. Chem. Technol. Biotechnol., 90 (2015) 608–640.
  22. C. Sophonsiri, E. Morgenroth, Chemical composition associated with different particle size fractions in municipal, industrial, and agricultural wastewaters, Chemosphere, 55 (2004) 691–703.
  23. E. Dulekgurgen, S. Doğruel, Ö. Karahan, D. Orhon, Size distribution of wastewater COD fractions as an index for biodegradability, Water Res., 40 (2006) 273–282.
  24. S. Murat Hocaoglu, G. Insel, E. Ubay Cokgor, A. Baban, D. Orhon, COD fractionation and biodegradation kinetics of segregated domestic wastewater: black and grey water fractions, J. Chem. Technol. Biotechnol., 85 (2010) 1241–1249.
  25. Ö. Karahan, S. Dogruel, E. Dulekgurgen, D. Orhon, COD fractionation of tannery wastewaters—particle size distribution, biodegradability and modeling, Water Res., 42 (2008) 1083–1092.
  26. S.M. Hocaoglu, D. Orhon, Fate of soluble residual organics in membrane bioreactor, J. Membr. Sci., 364 (2010) 65–74.
  27. S.T. Başaran, M. Aysel, H. Kurt, I. Ergal, A. Akarsubaşı, N. Yağcı, D. Orhon, Kinetic characterization of acetate utilization and response of microbial population in super-fast membrane bioreactor, J. Membr. Sci., 455 (2014) 392–404
  28. A.B. Yücel, Investigation of COD Behavior by Modelling of Activated Sludge System With a Membrane Module, MASM, MSc Thesis, Institute of Science and Technology, Istanbul Technical University, 2020.
  29. K. Noyan, B. Allı, D. Okutman Taş, S. Sözen, D. Orhon, Relationship between COD particle size distribution, COD fractionation and biodegradation characteristics in domestic sewage, J. Chem. Technol. Biotechnol., 92 (2017) 2142–2149.
  30. M. Henze, W. Gujer, T. Mino, M.C. van Loosdrecht, Activated Sludge Models ASM1, ASM2, ASM2d and ASM3, IWA Publishing, London, 2000.
  31. D. Orhon, N. Artan, Modelling of Activated Sludge Systems, Technomic Publishing Co., Lancaster, 1994.
  32. N. Artan, P. Wilderer, D. Orhon, R. Taşlı, E. Morgenroth, Model evaluation and optimization of nutrient removal potential, Water SA, 28 (2002) 423–432.
  33. D. Orhon, N. Artan, Y. Cimşit, The concept of soluble residual product formation in the modelling of activated sludge, Water Sci. Technol., 21 (1989) 339–350.
  34. Sumo® Wastewater Process Simulator, Dynamita Process Modeling, Nyons, France, 2018. Available at: http://www.
  35. E. Görgün, G. Insel, N. Artan, D. Orhon, Model evaluation of temperature dependency for carbon and nitrogen removal in a full-scale activated sludge plant treating leather-tanning wastewater, J. Environ. Sci. Health., Part A, 42 (2007) 747–756.
  36. D. Orhon, F. Germirli Babuna, Ö. Karahan, Industrial Wastewater Treatment by Activated Sludge, IWA Publishing, London, 2009.