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Treatment of Wastewater for Reuse; Flexo Printer

Would appreciate any suggestions that might help a flexographic 
printer that UW is assisting decrease wastewater: 

The company is a flexographic printer, manufacturing primarily 
printed kraft paper bags (grocery sacks, take-out bags, etc.)  All
inks used are water-based.  The company is not connected to a
municipal sewer system.  Only sanitary wastes are discharged to the
on-site septic system; other wastewater must be trucked to a municipal
wastewater treatment plant, at considerable expense.

There is considerable wastewater from cleanup of the paste makeup and 
 cooking operations, and from ink cleanup.  Presently, wastewater is
pretreated through precipitation and vacuum drum to remove solids, and
effluent is trucked to wastewater treatment plant.

The company would like to increase its reuse of wastewater.  They
tried in the past, but said that remaining bacteria in the wastewater
caused problems with paste makeup.  Said the bacteria caused the paste
to break down and lose strength.

Any experience and suggestions from P2Tech users that might help
identify improvements that would help company to successfully treat
wastewater to enable reuse for paste makeup?

Wayne P. Pferdehirt, P.E., AICP
U. of Wis., Solid & Hazardous Waste Education Center
610 Langdon Street, Room 529, Madison, WI  53703-1195
Phone:  608/265-2361     Fax:  608/262-6250