C&EE 153 Quiz: Homework 4
9 Jan 2019
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Cee 153 fall 17 homework 4 mass balance. Due: thursday, november 2. (in class) (no late submission accepted, unless otherwise approved earlier) A waste stabilization pond is used to treat a dilute municipal wastewater before the liquid is discharged into a river. The inflow to the pond has a flow rate of q = 4,000 m. /day and a bod concentration of cin = 25 mg/l. The volume of the pond is 20,000 m allow time for the decay of bod to occur before discharge into the environment. Bod de- cays in the pond with a first-order rate constant equal to 0. 25/day. You are in an old spy movie, and have been locked into a small room (volume 1,000 ft suddenly realize that a poison gas has just started entering the room through a ventilation duct. 3 are safe as long as the concentration is less than 100 mg/m. /min and the incoming gas concentration is 200 mg/m.
