Hong Hai Nguyen, Hong Ngoc Luong, Ngoc Kim Qui Nguyen, Le Phuong Uyen Nguyen, Phuong Thao Nguyen, Cong Sac Tran and Xuan Thanh Bui (2022) “Effects of settling time on the flocculation progress and treatment performance in the co-culture of microalgae-activated sludge photobioreactor”, Vietnam Journal of Science, Technology and Engineering, 64(4), pp. 91-95. doi: 10.31276/VJSTE.64(4).91-95.