Wang, LK, Wang, MHS, and Wong, JM (2019). Fiber separation using innovative circular gravity flotation and fiber detector. In: “Evolutionary Progress in Science, Technology, Engineering, Arts, and Mathematics (STEAM)”, Wang, Lawrence K. and Tsao, Hung-ping (editors). Volume 1, Number 11, November 2019; 68 pages. Lenox Institute Press, Newtonville, NY, 12128-0405, USA. No. STEAM-VOL1-NUM11-NOV 2019; ISBN 978-0-9890870-3-2. —————ABSTRACT: The authors introduce the theories, principles, innovative engineering design, potential applications, and practical applications of circular gravity flotation process, a floated fiber detector , and many new inventions in this book in memory of Dr. Milos Krofta, who was the founder and the President of both the Lenox Institute of Water Technology (LIWT) and Krofta Engineering Corporation (KEC). Although specific LIWT/KEC process equipment are mentioned as typical examples or case histories, the authors are introducing the circular gravity flotation process, the circular gravity sedimentation process (using zero horizontal velocity concept), enclosed biological flotation, the fiber detector, etc. all in general terms forming a progress report in STEAM (science, technologies, engineering, arts, and mathematics) for benefiting both academic and engineering communities. Any researchers and equipment manufacturers are encouraged to follow the authors’ foot-steps, and develop or build their own similar process equipment, for similar applications.