bbk 000000

UDC 628.356.5

Kevbrina M. V., KOZLOV M. N., Dorofeev A. G.

Secondary settlers: comparison of the calculation methods in designing and analysis of the parameters of efficient operation of the facilities


The results of the comparison of methods of calculating secondary settlers through the example of a model wastewater treatment plant (domestic method according to SNiP 2.04.03-85, German method according to Germany Standard ATV-DVWK-A131E, American method based on mass flow theory) are presented. It is shown that the surface area of settlers calculated according to Standard ATV has higher values compared to the calculations according to SNiP 2.04.03-85 and American method. The values of the surface area of settling tanks calculated according to SNiP 2.04.03-85 and American method are very close. At the same time the SNiP method is much simpler and requires much less initial parameters than the American method. For the domestic practice of operating secondary settlers it is proposed to introduce a new parameter – «dry matter loading on the settler surface» taken from the mass flow theory. This indicator indicates how much dry matter of the mixed liquor from aeration tanks enters per unit surface of secondary settlers per hour and corresponds to the incoming mass flow. By varying the dry matter loading on the surface of secondary settlers it is possible to provide for the standard suspended solids concentration in effluent. Through the example of the operating 54 m diameter settlers the dependence of the clarification efficiency on this parameter is shown.

Key words

, , , , ,

The further text is accessible on a paid subscription.
For authorisation enter the login/password.
Or subscribe


  1. Kanalizatsiya. Naruzhnye seti i sooruzheniya. [SNiP 2.04.03-85. Sewerage. Public utilities and structures. Moscow, USSR Committee on Construction, 1986.].
  2. Van Haandel A. C., van der Lubbe J. G. M. Handbook of biological wastewater treatment. Design and optimization of activated sludge systems. Second edition. IWA Publishing, 2012. www.wastewaterhandbook.com (accessed 18.10.2018).
  3. Šikić T., Meijer S. C. F., Yunico B. V., Širac S., Matošić M., Brdjanovic D. Five methods for secondary settler design. Filtration+Separation, July–August 2017, pp. 28–31.
  4. Tekhnicheskiy spravochnik po obrabotke vody. [Degrémont. Technical Guide on Water Treatment. In 2 v, v. 1. Saint-Peterburg, Novyi Zhurnal Publ., 2007, 920 p.].
  5. ATV-DVWK Standard A 131E, Dimensioning of single-stage activated sludge plants, water, wastewater, waste. Hennef, Germany, 2000. 57 p.
  6. Metcalf & Eddy. Wastewater engineering, treatment and reuse: 3th edition. Tata McGraw-Hill Publishing, USA, 1991.
  7. ATV-Handbuch. Mechanische Abwasserreinigung. Berlin, Verlag für Architektur und Technische Wissenschafften GmbH Ernst und Sohn, 1997.
  8. Kevbrina M. V., Gavrilin A. M., Kozlov I. M. [The new form of pre-fermentation process arrangement for removing nutrients from wastewater]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2014, no. 5, pp. 73–79. (In Russian).
  9. Marcos von Sperling. Basic principles of wastewater treatment. Biological Wasterwater Treatment Series. V. 2. London – New York, IWA Publishing, 2007.
  10. Design of municipal wastewater treatment plants. WEF Manual of Practice no. 8, ASCE Manual and Report on Engineering Practice, no. 76, 1998.

vstmag engfree 200x100 2

mvkniipr ru

Российская ассоциация водоснабжения и водоотведения

Конференция итог

ecw20 200 300