Vol 6, No 6 (2015) > Mechanical Engineering >

The Implementation of a Developed Microbubble Generator on the Aerobic Wastewater Treatment

Deendarlianto Deendarlianto, Wiratni Wiratni, Alva Edy Tontowi, Indarto Indarto, Anggita Gigih Wahyu Iriawan

 

Abstract:

An experimental study to
examine the capabilities of the microbubble generator (MBG) on aerobic
wastewater treatment was carried out under laboratory and industrial
conditions. The tested MBG types were porous pipe & orifice and an MBG with
a spherical body and drilled holes. In the laboratory-testing condition, an MBG
was placed at a depth of 40 cm from the water surface. Three different pressure
transducers were installed around the body of the MBG in order to analyze the
inlet water pressure, the air-suction pressure, and the pressure at the outlet
of the MBG. Next, the bubble diameter was measured by capturing the bubble
pictures using a digital camera and analyzed using a developed image-processing
technique. In order to simulate the application of the microbubble generator in
the industrial field, a feasibility test of the MBG in aerobic wastewater
treatment was performed. The results show the increase in MBG quantity with a higher ability to increase the oxygen, and
that it is necessary to arrange the placement of each MBG in configuration to
minimize bubble coalescence. Furthermore, by using a bio-ball as the porous
media for microorganism attachment in aerobic wastewater treatment, the
feasibility test showed promising results. Carbon on demand (COD) could be
reduced to around 354 mg/l. The value of dissolved Oxygen (DO) was larger than
2 mg/L. The Ph level remained at 6, and temperature remained no more than 35ºC,
which meet the requirements of aerobic wastewater treatment.

Keywords: Bubble generation efficiency; Freight aerobic wastewater treatment; Image-processing technique; Microbubble generator

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