An ideal continuous stirred tank reactor (CSTR) has an influent containing Chemical X at a concentration of 150 mg/l and a flow rate of 100 gpm (380 liters/min). Chemical X undergoes a first-order decay reaction having k = 0.40 hr –1 . Determine: 1a. The required detention time and volume of the CSTR if the effluent concentration contains 20 mg/l of Chemical X. Express the volume in both gallons and liters. 1b. Use a spreadsheet to perform the necessary calculations and then use the spreadsheet's graphing tools to plot two graphs; i. Pollutant removal efficiency, 1e, on the vertical or y-axis versus hydraulic detention time on the horizontal or x-axis. ii. Effluent concentration, CX1 , on the vertical or y-axis versus hydraulic detention time on horizontal or x-axis. Analyze and comment on the significance of the graphs. 1c. How many times larger must a CSTR be than a PFR to achieve 80 percent pollutant removal or conversion? 1d. How many times larger must a CSTR be than a PFR to achieve 90 percent pollutant removal or conversion?
An ideal continuous stirred tank reactor (CSTR) has an influent containing Chemical X at a concentration of 150 mg/l and a flow rate of 100 gpm (380 liters/min). Chemical X undergoes a first-order decay reaction having k = 0.40 hr –1 . Determine:
1a. The required detention time and volume of the CSTR if the effluent concentration contains 20 mg/l of Chemical X. Express the volume in both gallons and liters.
1b. Use a spreadsheet to perform the necessary calculations and then use the spreadsheet's graphing tools to plot two graphs; i. Pollutant removal efficiency,
1e, on the vertical or y-axis versus hydraulic detention time on the horizontal or x-axis. ii. Effluent concentration, CX1 , on the vertical or y-axis versus hydraulic detention time on horizontal or x-axis. Analyze and comment on the significance of the graphs.
1c. How many times larger must a CSTR be than a PFR to achieve 80 percent pollutant removal or conversion?
1d. How many times larger must a CSTR be than a PFR to achieve 90 percent pollutant removal or conversion?
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