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Abstrak :
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.

Abstrak :
ABSTRAK
Microbubble merupakan gelembung udara dengan diameter kurang dari 200 m di dalam air. Karakteristik unik yang dimiliki microbubble menyebabkan maraknya penggunaan microbubble dalam dunia industri. Penelitian mengenai performa dari generator microbubble dengan tabung silinder telah dilakukan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh debit air, debit udara masuk, void fraction, pressure drop, dan jumlah lubang udara terhadap performa dari microbubble generator. Penelitian dilakukan dengan menerapkan sistem water loop dan menggunakan dua tipe microbubble generator. Tipe-tipe microbubble generator tersebut adalah tipe dengan 12 lubang udara dan 48 lubang udara pada set up alat uji. Setelah dilakukan penelitian, ukuran bubble yang dihasilkan serta tipe microbubble generator yang tepat ditemukan. Tipe 2 48 lubang menghasilkan persentase microbubble yang lebih banyak. Hal ini terbukti paling optimum pada keadaan Qa= 30 lpm dan Qu=0,6 lpm.

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ABSTRACT
Microbubbles are bubbles with the diameter size smaller than 200 m. The unique characteristics of microbubbles enhance its industrial utilization. The research about Microbubble Generator with a Spherical Body has been done. The objection of this research is to find the relevance between water flow rate, air flow rate, void fraction, pressure drop, and the number of air suction holes with the performance of microbubble generator. The research is done by applying water loop system and two types of microbubble generator. The types of microbubble generator are microbubble generator with 12 air suction holes and 48 air suction holes for the experimental set up. The results of this research are the size of bubbles which are generated and the recommended microbubble generator type. Microbubble generator with 48 air suction holes is the optimum generator of this research. The optimum condition is 30 lpm for the water flow value and 0,6 lpm for the air flow.

Abstrak :
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.