Perhaps air is entering somehow - maybe via the gravity pipe to the
final chamber, dissolved carbon dioxide from neutralization, or air
itself adhering to the flocculated metals (or even from the flocculant,
which I would not guess is continually stirred, but made in batches).
An old fashioned solution might be to sprinkle lime (calcium oxide) over
the liquid in the clarifier. As lime is insoluble in neutral or basic
solution, it provides a high surface area for gas collection and allows
the floc to settle. It is then removed through the press.
Best of luck,
Condor
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