20million litres per day (MLD) of a conservative substance, with a concentration of 10mg/L is released into a stream having an upstream flow of 50 MLD and a substance concentration of 3mg/L. Assumin g complete mixing:
what is the concentration in ppm just downstream?
what is the mass flow rate of the substance in kg/day passing just downstream?
The concentration just down stream is a weighted average of the two flows (upstream and released)
Originally Posted by Haris
For part 2 you just need to multiply flow by concentration
Now there are 10^6 mg in a kg so the mass flow just downstream is 350 kg per day.
Hope this helps.