MODELING OF THE PROCESS OF BIOLOGICAL PURIFICATION IN AEROTANK-DISPLACER WITH BIOCENOSIS, FIXED ON CYLINDRICAL ELEMENTS

Authors

Abstract

Biological purification is an important element in the technology of processing household waste water. At many biological purification stations aerotanks are used. At relatively low concentrations of organic pollution, aerotanks-displacer are used. An analysis of existing methods of intensifying the work of aerotanks showed that the application of fixed biocenose is promising. The location of the immobilized biocenose is assumed to be on elements of various shapes. The fixed biocenose has the best extraction ability. The concentration of the fixed biocenose is much greater than the concentration of active sludge.

A two-level mathematical model of biological purification in aerotanks-displacers with fixed biocenosis is improved. Elements with an fixed biocenosis of cylindrical shape are considered. The model takes into account the degree of oxygen supply on the process.The mathematical model is based on the equations of transport along the length of the aerotank of the concentration organic pollution and also the equation of transport of organic pollution  and the oxygen over the thickness of the biofilm. These equations are written in a cylindrical coordinate system. The rate of oxidation of organic pollution and oxygen consumption by a suspended and fixed biocenosis is described by the Mono equation. The system of equations is solved by the method of finite differences. The results of theoretical studies of the influence of the oxygen regime, and also the location and distribution of elements with an fixed biocenosis on the purification efficiency are presented.

The efficiency of using cylindrical and rectangular elements is compared. The advantages of cylindrical elements are explained. When using cylindrical elements, their arrangement along the length of the aerotank has less influence in comparison with elements of a rectangular shape. The distribution of the concentration of organic pollution and the concentration of oxygen in the thickness of the biofilm using elements of cylindrical and rectangular shape was studied. The contribution of the concentration of organic pollution and the concentration of oxygen on the oxidation process in biofilm is estimated, and their limiting effect is estimated. When using cylindrical elements, the limiting effect of the oxygen regime decreases. When using cylindrical elements, the volume of biofilm decreases, more complete oxygenation is performed, and the process of oxidation of organic pollution is greatly intensified.

 

Keywords: wastewater, aerotank-displacer, cylindrical elements, fixed biocenosis, organic pollution, mathematical model

Author Biographies

, O.M. Beketov National University of Urban Economy in Kharkiv

кандидат технічних наук, доцент, доцент кафедри водопостачання, водовідведення і очищення вод

, Kharkov National University of Civil Engineering and Architecture

доктор технічних наук, доцент, професор кафедри водопостачання, каналізації і гідравліки

References

Література

Von Sperling, M., (2007). Biological wastewater treatment series. Vol 5: Activated sludge and aerobic biofilm reactors. London: IWA Publishing, 328.

Gebara, F. (1999). Activated sludge biofilm waste water treatment system. Wat. Res., 13(1), 230-238.

Олійник, О. Моделювання очистки стічних вод від органічних забруднень в біореакторах-аеротенках зі зва-женим (вільноплаваючим) і закріпленим біоценозом [Текст] / О. Олійник, Т. Айрапетян // Доповіді НАНУ. – К., 2015. – №5. - С. 55-59.

Henze, M., M. Van Loosdrecht, M.C., Ekama, G.A., Brdjanovic, D. (2008). Biological Wastewater Treatment. Iwa Publishing, London, 511.

Святенко, А.І. Дослідження зміни ефективності очи-щення стічних вод в аеротенках під впливом різних чинни-ків [Текст] / А.І. Святенко, Н.М. Дяденко, Т.Г. Нечипоре-нко-Шабуніна // Екологічна безпека. – 2011. - №11. – С. 64–66.

Liao, Q., Tian, X., Chen, R., Zhu, X. (2007). Mathematical model for gas liquid two-phase flow and biodegradation of a low concentration volatile organic compound (VOC) in a trickling biofilter. Internal. J. of Heat and Mass Transfer, 1–13.

Wanner, O., Ebert, N.I., Rittman, B.E. (2006). Matematical modeling of biofilms. Scientificand Technical report, 18, 208.

Kolpakova, О. (2015). Theoretical studies and calculations of wastewater treatment in trickling biofilters MOTROL. Commission of motorization and energetics in agriculture: Polish Academy of sciences, Lublin-Rzeszow, 17(8), 165-173.

Oleynik, A., Airapetian, Т. (2017) Оxygen regime in re-search on the work of plugflow aeration tanks with fixed bio-masses. Eastern-European Journal of Enterprise Technologies, 4/10 (88), 4-12.

Айрапетян, Т.С. Визначення раціональних параметрів аеротенків-витискувачів з закріпленим біоценозом та врахуванням кисневого режиму [Текст] / Т.С. Айрапетян // Проблеми водопостачання, водовідведення та гідравлі-ки. - К.: КНУБА, 2017. - Вип. 28.– С. 12-18.

References

Von Sperling, M., (2007). Biological wastewater treatment series. Vol 5: Activated sludge and aerobic biofilm reactors. London: IWA Publishing, 328.

Gebara, F. (1999). Activated sludge biofilm waste water treatment system. Wat. Res., 13(1), 230-238.

Oleynik, A., Airapetian, T. (2015). Modelling of the waste water treatment from the organic contaminations in the bioreactors-aerotanks with suspended (free flowing) and fixed biocenosis. Reports of the National Academy of the Sciences of the Ukraine, 5, 56-61 (in Ukrainian).

Henze, M., M. Van Loosdrecht, M.C., Ekama, G.A., Brdjanovic, D. (2008). Biological Wastewater Treatment. Iwa Publishing, London, 511.

Svyatenko, A., Dyadenko,N., Nechiporenko-Shabunina, T. (2011). Research of change of efficiency of sewage treatment in aerotanks under the influence of different factors. Ecological safety, 1, 64–66.

Liao, Q., Tian, X., Chen, R., Zhu, X. (2007). Mathematical model for gas liquid two-phase flow and biodegradation of a low concentration volatile organic compound (VOC) in a trickling biofilter. Internal. J. of Heat and Mass Transfer, 1–13.

Wanner, O., Ebert, N.I., Rittman, B.E. (2006). Matematical modeling of biofilms. Scientificand Technical report, 18, 208.

Kolpakova, О. (2015). Theoretical studies and calculations of wastewater treatment in trickling biofilters MOTROL. Commission of motorization and energetics in agriculture: Polish Academy of sciences, Lublin-Rzeszow, 17(8), 165-173.

Oleynik, A., Airapetian, Т. (2017) Оxygen regime in re-search on the work of plugflow aeration tanks with fixed bio-masses. Eastern-European Journal of Enterprise Technologies, 4/10 (88), 4-12.

Airapetian, Т. (2017) Determination of rational parameters of aerotanks- displacers with fixed biocenosis and taking into account the oxygen regime. Problems of water supply, sewerage and hydraulic. Kyiv, KNUCA, 28, 12-18.

Published

2018-07-27

How to Cite

, & . (2018). MODELING OF THE PROCESS OF BIOLOGICAL PURIFICATION IN AEROTANK-DISPLACER WITH BIOCENOSIS, FIXED ON CYLINDRICAL ELEMENTS. Municipal Economy of Cities, (142), 49–54. Retrieved from https://khg.kname.edu.ua/index.php/khg/article/view/5218

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