Hong, S. W., C. Park, T. H. Chung, and Y. S. Choi. “Solid–liquid Separation of Activated Sludge by Flotation Using Microporous Ceramic Diffuser”. Journal of Applied Membrane Science & Technology 7, no. 1 (November 20, 2017). Accessed September 29, 2021. https://amst.utm.my/index.php/amst/article/view/54.