Young Sludge Floc Size

straggler Floc, large, fluffy, irregular shape







Old Sludge Floc Size

pin Floc, round, small, granular







Young Sludge Foam Characteristics

white, billowy, crisp







Old Sludge Foam Characteristics

shiny, dark tan, greasy, dark leathery







Young Sludge Indicator Organisms

Amoebae, Flagellates







Old Sludge Indicator Organisms

Rotifers, worms, nematodes







Young Sludge MLSS

low, under-oxidized







Old Sludge MLSS

high, over-oxidizes






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