Effect Of Different Shapes Of Air Diffusers On Removal Of Chemical Oxygen Demand Of Wastewater In Activated Sludge Process

Authors

  • N. Dashora
  • D. Bhatkhande
  • M. Deosarkar
  • S. Khamparia

Abstract

Abstract

One of the challenges faced in activated sludge process is the low solubility of oxygen in wastewater, affecting the microbial activity due to mass transfer limitations and ultimately hampering the effluent quality. To overcome this limitation various types of diffusers have been in use but the configuration in which the aerators must be placed is still an open question. A series of experiments were conducted using different shapes of diffuser namely I, E and Hand efficiency of these were compared for removal of COD at low and high ranges for same amount of hydraulic retention time. Best results were observed for E shaped diffuser at high COD loadings and COD removal efficiency of 79.94% was obtained whereas I and H shape gave removal efficiency of 50% and 70% respectively. At low COD values, H shaped diffuser performed better with COD removal efficiency of 68.497% while E and I shaped diffuser gave COD removal efficiency of 46.153% and 33.625% respectively. I shaped aerator did not produce effective results in both the cases.

Keywords:Activated sludge process, chemical oxygen demand, hydraulic retention time, diffuser configuration.

References

Bouhabila EH, Aim RB, Buisson H. Microfiltration of activated sludge using submerged membrane with air bubbling (application to wastewater treatment). Desalinaton.1998;118(1-3):315-322.

Brandi G, Sisti M, Amagliani G. Evaluation of the environmental impact of microbial aerosols generated by wastewater treatment plants utilising

different aeration systems.J. Appl. Microbiol. 2000; 88(5):845-852.

DeMoyer C, Gulliver J, Wilhelms S. Comparison of submerged aerator effectiveness. Lake Reservoir Manag.2001; 17(2):139-152.

Rosso D, Larson LE,Stenstom MK. Aeration of large-scale municipal wastewater treatment plants: state of the art. Water Sci. Technol.2008; 57(7): 973-978.

Liu C, Tanaka H, Zhang L, et al. Fouling and structural changes of Shirasu porous glass (SPG) membrane used in aerobic wastewater treatment process for microbubble aeration. J. Membr. Sci. 2012;421-422: 225-231.

Rao A, Kumar B, Patel A.Relative performance of different shaped surface aeration tank.Water Qual. Res. J. Canada.2007;42(1):26-40.

Al-Ahmady K. Analysis of oxygen transfer performance on sub-surface aeration systems.Int. Environ. Res. Public Health. 2006;3(3):301-308.

Nadayil J, Mohan D, Dileep K,et al. A study on effect of aeration on domestic wastewater. Int. J. Interdiscip. Res.Innov.2015;3(2):10-15.

Gresch M, Armbruster M, Braun D, et al. Effects of aeration pattern on the flow field in wastewater aeration tanks. Water Res.2011; 45(2): 810-818.

Wu J, He C. Effect of cyclic aeration on fouling in submerged membrane bioreactor for wastewater treatment. Water Res. 2012; 46(11):3507-3515.

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Published

2020-09-23

Issue

Vol. 7 No. 2 (2020)

Section

Research Article

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