Swirl Type Microbubble Generator Application in Artificial Wastewater Treatment Drajat Indah Mawarni, Hartono Guntur Ristiyanto
Sekolah Tinggi Teknologi Ronggolawe
Abstract
Microbubble generator (MBG) is a tool that can produce micro-sized air bubbles. One of the unique properties of this microbubble is that it can remain in water for quite a long time because its buoyancy force is small, so it can increase dissolved oxygen in the water. This study will discuss the application of MBG in synthetic wastewater treatment. One indicator of the success of wastewater treatment is reducing COD (chemical oxygen demand) in wastewater. This experiment is carried out by varying the water discharge (QL) from 25 to 80 Lpm. Meanwhile, the air discharge (Qg) is from 0.1 to 0.6 Lpm. To see the size and distribution of microbubbles, this is done using a high speed video camera. Whereas, the measurement of COD for synthetic wastewater samples is carried out using the colorimetric closed reflux method. The result of the study shows that the increasing of QL at constant Qg will increase the rate of mass transfer of air to water, thereby it increases the rate of COD reduction. Meanwhile, the increasing of Qg at constant QL will increase the bubble diameter, but on the other hand the number of bubbles also increases. However, the increasing of dissolved oxygen is not more significant than the increasing of water discharge.
Keywords: microbubble generator, buoyancy force, aerasi, chemical oxygen demand, high speed video camera, refluks method.
