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Ask the Expert Question-and-Answer Archive (Wastewater Treatment)

by Mike McGinness, EcoShield Environmental Systems, Inc.
March, 2012

Calculating Chrome Discharge Limits

Q. My chrome discharge limit is-lets say- 0.5 mg/day. The wastewater flow is 400 gpd. If the result of my sampling was 0.12 mg/L. How do I know if I am in compliance?

A. Is your limit .5 mg/day, or .5 mg/l?

.5 mg/day is unusual, if not unheard of?

But to answer your question:

Take the (400 Gallons/day)*(.12 mg/Liter)*( 3.78 liters/gallon) = 181.44 mg/day of Chrome discharged

Best Regards,

Mike McGinness

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