Research on the Aeration Systems’ Efficiency of a Lab-Scale Wastewater Treatment Plant
In order to obtain efficient pollutants removal in
small-scale wastewater treatment plants, uniform water flow has to be
achieved. The experimental setup, designed for treating high-load
wastewater (leachate), consists of two aerobic biological reactors and
a lamellar settler. Both biological tanks were aerated by using three
different types of aeration systems - perforated pipes, membrane air
diffusers and tube ceramic diffusers. The possibility of homogenizing
the water mass with each of the air diffusion systems was evaluated
comparatively. The oxygen concentration was determined by optical
sensors with data logging. The experimental data was analyzed
comparatively for all three different air dispersion systems aiming to
identify the oxygen concentration variation during different
operational conditions. The Oxygenation Capacity was calculated for
each of the three systems and used as performance and selection
parameter. The global mass transfer coefficients were also evaluated
as important tools in designing the aeration system. Even though
using the tubular porous diffusers leads to higher oxygen
concentration compared to the perforated pipe system (which
provides medium-sized bubbles in the aqueous solution), it doesn’t
achieve the threshold limit of 80% oxygen saturation in less than 30
minutes. The study has shown that the optimal solution for the
studied configuration was the radial air diffusers which ensure an
oxygen saturation of 80% in 20 minutes. An increment of the values
was identified when the air flow was increased.
[1] M. Metcalf, E. Eddy, Wastewater Engineering: Treatment Disposal,
Reuse, McGraw-Hill Inc., New York, 2002.
[2] C. Bumbac, I.A. Ionescu, O. Tiron, V.R. Badescu, “Continuous flow
aerobic granular sludge reactor for dairy wastewater treatment” Water
Sci Technol. 2015;71(3):440-445.
[3] D. Robescu, S. Lanyi, Diana Robescu, I. Constantinescu, A. Verestoy,
“Wastewater Treatment Technologies, Installations and Equipment”,
Editura Tehnică, Bucharest, 2001.
[4] D. Robescu, A. Călin, D. N. Robescu,” Theoretical and experimental
researches on the performances of an aeration system used for hybrid
wastewater treatment”, U.P.B. Sci. Bull., Series D, Vol. 72, ISSN 1454-
2358, p. 67-76, 2010.
[5] Y. Lemoullec, O. Potier, C. Gentric, J.P. Leclerc, “A general correlation
to predict axial dispersion coefficients in aerated channel reactors”,
Water Research, vol. 42, 2008, pp.1767 – 1777.
[6] S. Gillot , S. Capela-Marsal, M. Roustan, A. Heduit, “Predicting oxygen
transfer of fine bubble diffused aeration systems-model issued from
dimensional analysis”, Water Research, vol. 39, 2005, pp. 1379-1387;
[7] M.R. Wagner and H.J. Pöpel, “Oxygen transfer and aeration
efficiency—influence of diffuser submergence, diffuser density, and
blower type” Water Sci. Technol., vol.38, 1998, pp. 1–6.
[8] D. Rosso, M.K. Stenstrom, “Economic implications of fine pore diffuser
aging”, Water Environ. Res., vol.78, no.8, Aug. 2006, pp. 810.
[9] Degremont, Water Treatment Handbook, 6th edition, Lavoisier, Paris,
1991.
[10] V. Linek, M. Kordac, T. Moucha, “Mechanism of mass transfer from
bubbles in dispersions Part II: Mass transfer coefficients in stirred gasliquid
reactor and bubble column”, Chemical Engineering and
Processing, vol. 44, 2005, pp. 121-130.
[11] O. Potier, J.-P. Leclerc, M.-N. Pons, “Influence of geometrical and
operating parameters on the axial dispersion in an aerated channel
reactor”, Water Res., vol. 39, 2005, pp. 4454– 4462.
[12] J. Dudley, “Process testing of aerators in oxidation ditches”, Water Res.,
vol. 29, no. 9, 2005, pp. 2217–2219;
[13] J. Makinia, S.A. Wells, “A general model of the activated sludge reactor
with dispersive flow—II. Model verification and application”, Water
Res., vol. 34, 2000 b, pp. 3997–4006.
[14] American Society of Civil Engineers, “Standard for the Measurement of
Oxygen Transfer in Clean Water”. ASCE, New York, 1992.
[15] S. Krause, P. Cornel, M. Wagner, Comparison of different oxygen
transfer testing procedures in full scale membrane bioreactors,
Darmstdat University of Technology, Germany, Paper reference no. e
21131a.
[1] M. Metcalf, E. Eddy, Wastewater Engineering: Treatment Disposal,
Reuse, McGraw-Hill Inc., New York, 2002.
[2] C. Bumbac, I.A. Ionescu, O. Tiron, V.R. Badescu, “Continuous flow
aerobic granular sludge reactor for dairy wastewater treatment” Water
Sci Technol. 2015;71(3):440-445.
[3] D. Robescu, S. Lanyi, Diana Robescu, I. Constantinescu, A. Verestoy,
“Wastewater Treatment Technologies, Installations and Equipment”,
Editura Tehnică, Bucharest, 2001.
[4] D. Robescu, A. Călin, D. N. Robescu,” Theoretical and experimental
researches on the performances of an aeration system used for hybrid
wastewater treatment”, U.P.B. Sci. Bull., Series D, Vol. 72, ISSN 1454-
2358, p. 67-76, 2010.
[5] Y. Lemoullec, O. Potier, C. Gentric, J.P. Leclerc, “A general correlation
to predict axial dispersion coefficients in aerated channel reactors”,
Water Research, vol. 42, 2008, pp.1767 – 1777.
[6] S. Gillot , S. Capela-Marsal, M. Roustan, A. Heduit, “Predicting oxygen
transfer of fine bubble diffused aeration systems-model issued from
dimensional analysis”, Water Research, vol. 39, 2005, pp. 1379-1387;
[7] M.R. Wagner and H.J. Pöpel, “Oxygen transfer and aeration
efficiency—influence of diffuser submergence, diffuser density, and
blower type” Water Sci. Technol., vol.38, 1998, pp. 1–6.
[8] D. Rosso, M.K. Stenstrom, “Economic implications of fine pore diffuser
aging”, Water Environ. Res., vol.78, no.8, Aug. 2006, pp. 810.
[9] Degremont, Water Treatment Handbook, 6th edition, Lavoisier, Paris,
1991.
[10] V. Linek, M. Kordac, T. Moucha, “Mechanism of mass transfer from
bubbles in dispersions Part II: Mass transfer coefficients in stirred gasliquid
reactor and bubble column”, Chemical Engineering and
Processing, vol. 44, 2005, pp. 121-130.
[11] O. Potier, J.-P. Leclerc, M.-N. Pons, “Influence of geometrical and
operating parameters on the axial dispersion in an aerated channel
reactor”, Water Res., vol. 39, 2005, pp. 4454– 4462.
[12] J. Dudley, “Process testing of aerators in oxidation ditches”, Water Res.,
vol. 29, no. 9, 2005, pp. 2217–2219;
[13] J. Makinia, S.A. Wells, “A general model of the activated sludge reactor
with dispersive flow—II. Model verification and application”, Water
Res., vol. 34, 2000 b, pp. 3997–4006.
[14] American Society of Civil Engineers, “Standard for the Measurement of
Oxygen Transfer in Clean Water”. ASCE, New York, 1992.
[15] S. Krause, P. Cornel, M. Wagner, Comparison of different oxygen
transfer testing procedures in full scale membrane bioreactors,
Darmstdat University of Technology, Germany, Paper reference no. e
21131a.
@article{"International Journal of Earth, Energy and Environmental Sciences:70740", author = "Oliver Marunțălu and Elena Elisabeta Manea and Lăcrămioara Diana Robescu and Mihai Necșoiu and Gheorghe Lăzăroiu and Dana Andreya Bondrea", title = "Research on the Aeration Systems’ Efficiency of a Lab-Scale Wastewater Treatment Plant", abstract = "In order to obtain efficient pollutants removal in
small-scale wastewater treatment plants, uniform water flow has to be
achieved. The experimental setup, designed for treating high-load
wastewater (leachate), consists of two aerobic biological reactors and
a lamellar settler. Both biological tanks were aerated by using three
different types of aeration systems - perforated pipes, membrane air
diffusers and tube ceramic diffusers. The possibility of homogenizing
the water mass with each of the air diffusion systems was evaluated
comparatively. The oxygen concentration was determined by optical
sensors with data logging. The experimental data was analyzed
comparatively for all three different air dispersion systems aiming to
identify the oxygen concentration variation during different
operational conditions. The Oxygenation Capacity was calculated for
each of the three systems and used as performance and selection
parameter. The global mass transfer coefficients were also evaluated
as important tools in designing the aeration system. Even though
using the tubular porous diffusers leads to higher oxygen
concentration compared to the perforated pipe system (which
provides medium-sized bubbles in the aqueous solution), it doesn’t
achieve the threshold limit of 80% oxygen saturation in less than 30
minutes. The study has shown that the optimal solution for the
studied configuration was the radial air diffusers which ensure an
oxygen saturation of 80% in 20 minutes. An increment of the values
was identified when the air flow was increased.", keywords = "Flow, aeration, bioreactor, oxygen concentration.", volume = "9", number = "9", pages = "1073-5", }