| 研究実績の概要 |
In the PhD stage, I conducted a study to elucidate the mechanism of bacterial cell disruption in activated sludge treatment by using a high pressure jet device (HPJD) (2016 - 2017). The HPJD consists of a high pressure pump and a tubular pipe with two independent entrances. The lateral port of HPJD is connected to a high-pressure pump to transport sludge via a nozzle at a high lateral velocity while the top port receives sludge by aspiration. The dual supply of sludge from horizontal and vertical directions generates frictional shear, fine bubbles (as a result of cavitation), and collision. These multiple effects disrupt bacterial cells and allow the release of intercellular compounds from damaged cells resulting in sludge reduction. My study revealed that cavitation was the dominate effect for cell disruption (Published in Chemical Engineering Journal (IF=6.216) in 2017). After I got PhD degree in 2017, I focused on the study about application of HPJD as a pretreatment in sludge anaerobic digestion to enhance sludge reduction and methane production. The applicability of HPJD on sludge anaerobic digestion was already confirmed by lab scale digestion tests using excess activated sludge and seed sludge were collected from Nakagawa and Morigasaki Water Reclamation Center
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