Where Have All the Solids Gone?

Tiny, short-lived flying insects created a serious process problem at a small package-type activated sludge treatment plant
Where Have All the Solids Gone?
FIGURE 1: Sludge clumps in the aeration tanks looked gray, like shaggy mop heads rising and sinking.

Early one morning, the Lab Detective received a call from a local operator, who described an extended aeration activated sludge package-type wastewater treatment plant serving a small community, with a permitted capacity of about 50,000 gpd.

The operator said the plant had been...

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