I am having problems with floating sludge in my clarifier.  Instead of a
clarifier I have a desolved air flotation system.  The system is as follows:
- Continuous treatment system about (80 gpm) treating all printed circuit
board chemical manufacturing waste.
- First step: the waste floes to a lift station where it is pumped into the
first treatment tank.
-The first tank: The pH adjusted to 8.0 with caustic,
sodiumdimethyldithiocarbamate (DTC) is added to an ORP of around 0 mv.  Then
it flows by gravity to the second tank.
- The second tank: Polyaluminium chloride, and an anionic polyelectrolyte is
added.  The treated solution then flows by gravity into the clarifier.

I have tried different concentrations of anionic flocculent, it doesn't seem
to be a floccluent overdose.

If anyone can help I would really be greatful.

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