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posted by  Mulla Omar on 6/11/2008 9:43:48 PM  |  status: Closed  

Environmental Engineering Mass and Energy Transfer

Course Textbook Chapter Problem
Environmental Science & Engg N/A N/A N/A
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posted by PDavis88 on 6/20/2008 1:50:53 PM  |  status: Live
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Mulla Omar's comment:
"this is exponental decay"
Response Details:
So in 15 days, there was a reduction of 148 mg/L in waste.
Try:
148/15=9.87 reduction per day (which I would assume is the rate you are looking for)

Now, take .99*280 and that tells you how much you have to get rid of to achieve 99% reduction
.99*280=277.2

so if you're taking out 9.87 per day and you go until you get rid of 277.2, it will take:
277.2/9.87=28.1 days
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