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We are currently working with a company that has a 5 stage cleaning
line prior to a painting operation. The 5 stages are Alkaline clean
- rinse (1500 gal tank) - phoshoric acid - rinse (450 gallon tank)
- non chrome seal). The rinse water flow rates are currently set at
18 gpm. We are suggesting a counter current system to lower flow
rates along with routine or continuous testing/ monitoring.
My question is, does anyone know the typical contamination level of an
alklaine cleaner rinse and an acid rinse. The numbers we are using
as a guide are:
TDS test: Alkaline cleaner rinse 750 mg/L
Acid rinse 150 mg/L
Conductivity test: Alkaline cleaner rinse 1000-2000 microsiemens/ cm
Acid rinse 500 microsiemens/ cm
Do these numbers sound feasible?
We would appreciate all comments.
Thanks in advance
NC Division of Pollution Prevention
and Environmental Assistance
PO Box 29569
Raleigh, NC 27626-9569
Tel: (919) 715-6526
Fax: (919) 715-6794