Figure 7. Photomicrographs showing flocs shape, size and filaments: (A and B) round and compact flocs containing filaments from Plant 1, (C and D) pin point flocs with no filaments from plant 2, and (E and F) open and irregular flocs with filaments from plant 3

From

Effect of Dissolved Oxygen Concentration on Morphology and Settleability of Activated Sludge Flocs

Melvin-Guy Adonadaga

Journal of Applied & Environmental Microbiology. 2015, 3(2), 31-37 doi:10.12691/jaem-3-2-1