Question

nment #2 (Part A & B) Assigned: 01/23/2019 Due Date: 02/01/2019 Total Points 110 Part B A completely mixed flow reactor is to be designed to treat an influent stream with a COD concentration of 250 mg/L and a flow rate of 150 gallons per minute (GPM). Assume COD removal reaction has a degradation rate constant of 0.38 h1. Determine the hydraulic detention time (in hours) for the reactor and the volume of the reactor in ftIf the effluent COD is 20 mg/L (COD-chemical oxygen demand, COD represents the total quantity of oxygen required to oxidize organic matters to carbon dioxide and water; it is measure of contamination). (10)

Answer 1

Influent concentration, Co 250 mg/L Effluent concentration, Ce 20 mg/L Rate constant, K 0.38 h1 Flow rate, Q 150 gpm 9000 gallons/hour 1203 ft3/hr For a completely mixed flow reactor, 1. For 1st order reaction, 1203 I250 0.38 20 V 36406.5 ft3 HRT- 36406.5 HRT- 1203 HRT 30.26 hours 2. For 2"d order reaction, KCe LCe 1203 [250 0.38 x 20 L20 V 1820.3 ft3 HRT- HRT 1820.3 1203 HRT 1.51 hours