高圧噴射装置による細菌細胞溶解メカニズム解明と余剰汚泥削減への応用

在博士阶段，我进行了一项研究，以阐明高压喷射装置(HPJD)处理活性污泥中细菌细胞破坏的机理(2016-2017)。HPJD由一个高压泵和一个有两个独立入口的管状管道组成。HPJD的侧口与高压泵相连，通过喷嘴高速输送污泥，顶口通过抽吸的方式接收污泥。水平和垂直方向的双重污泥供应会产生摩擦剪切、细小气泡(空化的结果)和碰撞。这些多重作用破坏细菌细胞，并允许受损细胞释放细胞间化合物，从而减少污泥。我的研究表明，空化是细胞破坏的主要影响因素(2017年发表在《化学工程杂志》(IF=6.216)上)。2017年获得博士学位后，重点研究了HPJD在污泥厌氧消化中的应用，以促进污泥减量和甲烷产量的提高。HPJD在污泥厌氧消化中的适用性已经被实验室规模的消化试验所证实，利用中川和森崎水再生中心的剩余活性污泥和种子污泥进行消化试验

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