Degradation Of Organic Matter Using A
Submerged Micro Bubble Diffuser In A
Biological Wastewater Treatment System
Author(s)
S. R. M. Kutty, F. E. W. Winarto, S. I. U. Gilani,
A. A. Anizam, W. W. Z. Karimah & M. H. Isa
Abstract
.
In most biological wastewater treatment systems, aeration is provided using
millimetre diffusers of various sizes. The aeration is to provide mixing, as well
as oxygen, for the microorganisms in the degradation of organic matter. In this
study, the effectiveness of using micro diffusers in the degradation of organic
matter was evaluated. Two reactors A and B, of size 140x140x500 mm, were
constructed using Perspex to treat municipal wastewater. Aeration in reactors A
and B was provided using a millimetre diffuser and a micro diffuser,
respectively. The diffusers consist of perforated aluminium plate to generate
millimetre bubbles and sintered porous glass to generate micro bubbles.
Compressed air was forced through two parallel flow meters at a flow rate of 2.5
L/min. Biomass for both reactors were acclimatized prior to treating the
municipal wastewater in the reactors. Two batch experiments were conducted at
26°C for the estimation of the kinetic parameters for the degradation of organic
matter. Samples were evaluated for chemical oxygen demand (COD) and soluble
chemical oxygen demand (sCOD) for both reactors at approximately 1 hour, 3
hours, and 6 hours, respectively, until 48 hours, for each batch of experiment.
From the results of the study, it was found that for the micro and millimetre
diffusers, the degradation kinetic parameter kCOD was 0.041 and 0.028,
respectively, for COD and ksCOD was 0.060 and 0.044, respectively, for sCOD.
On average, the micro and millimetre diffusers removed COD at approximately
87% and 81%, respectively, and removed sCOD at approximately 91% and 75%,
respectively. It can be concluded that the use of a micro diffuser can provide a
higher degradation of organic matter.
Keywords
micro air bubbles, COD, sCOD, DO, kinetics evaluation
Related Book
Other papers in this volume
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