Vol 6, No 7 (2015) > Chemical Engineering >

Enhancement of Aerobic Wastewater Treatment by the Application of Attached Growth Microorganisms and Microbubble Generator

Wiratni Budhijanto, Deendarlianto Deendarlianto, Heppy Kristiyani, Dodi Satriawan

 

Abstract:

This paper presents the efficiency improvement
in aerobic wastewater treatment technology through the application of a
microbubble generator (MBG) for aeration. Aeration using an MBG is accomplished
through water circulation and does not need air compressors, making it more
energy efficient than conventional aerators. The MBG aerobic system with the variations
on liquid flow rate (Q1) and airflow rate (Qg)
combination was tested using artificial wastewater with a typical composition
of organic waste. Experimental data were evaluated by means of a simplified
mathematical model to systematically compare different MBG schemes. The study
confirmed that the soluble chemical oxygen demand (SCOD) removal efficiency was
significantly affected by the Qg values. Lower Qg values
were preferable because they tended to have higher soluble chemical oxygen
demand (SCOD) removal efficiency. However, the microbubbles were less stable at
lower Qg due to the high incidence of bubble collisions. The study
concluded that for applications in an actual aerobic waste treatment pond, the
positioning of the MBG in the pond had to be carefully designed to minimize the
collision tendency.

Keywords: Aerobic digestion; Attached growth; Biofilm; Microbubble generator

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