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1 Module 6 Problem Set Problem 1 A four-stage laboratory RBC unit with a wetted area of 1.507 ft 2/stage was used in a treatability study for the determination of the treatability factor P (mg/ft 2d) and the half-velocity constant K s (mg/l). A synthetic wastewater with a BOD 5 of 250 mg/l was used. The study was conducted at three different flow rates and generated effluent quality data for each stage given in the table below. Use these experimental data to determine the values of the two constants P (mg/ft 2d) and K s (mg/l). Q, l/d S1, mg/l BOD 5 S2, mg/l BOD 5 S3, mg/l BOD 5 S4, mg/l BOD 5 10 108 64 52 28 15 120 78 59 45 20 130 88 65 50 Problem 2 A three-stage rotating biocontactor system is to be designed to treat a wastewater flow of 0.1 MGD with a strength of 250 mg/l BOD 5. A treatability study revealed a P = 2500 mg/ft 2day and a K s = 100 mg/l. Compute the area requirements if an effluent having a BOD 5 of 15 mg/l is desired. Problem 3 Design a RBC plant to treat a wastewater flow of 1 MGD. Pertinent data are: influent BOD 5 = 200 mg/l; desired effluent BOD 5 ≤ 20 mg/l; number of stages = 3; k = 1.15 gal/d/ft 2. Use the graphical method to determine: 1) the design hydraulic loading (gpd/d/ft 2); 2) the BOD 5 after each stage (mg/l); 3) the disk area per stage (ft 2); 4) the total disk area (ft 2). Problem 4 Pb. 9-1 Textbook (flowrate 390 m 3/h) Problem 5 A primary effluent with Q = 1.0 MGD, BOD 5 = 138 mg/l, and SS = 104 mg/l is treated by a single stage tricking filter with the following characteristics: 6 feet deep rock trickling filter media; design BOD loading of 50 lb/day/1000 ft 3; design hydraulic loading of 0.30 gpm/ft 2; recirculation ratio of 1.5. Determine: 1) the volume (ft 3) and diameter (ft) of the trickling filter; 2) the effluent BOD concentration. Problem 6 An experimental trickling plastic media filter operated for the purpose of establishing values for the treatability factor K and the media constant n produced the following results: Hydraulic loading, m 3/m 2d  25 35 40 Depth, m Effluent BOD 5 , mg/l 0 220 220 220 2 90 115 160 4 56 68 130 6 20 34 55 8 15 22 38 10 10 14 25 Use the data given above and the Germain-Schultz equation = A T L :− - & / 3 ; and determine the values of K (m/d) nm -1 and n (show all work). 1 Module 6 Problem Set Problem 1 A four-stage laboratory RBC unit with a wetted area of 1.507 ft 2/stage was used in a treatability study for the determination of the treatability factor P (mg/ft 2d) and the half-velocity constant K s (mg/l). A synthetic wastewater with a BOD 5 of 250 mg/l was used. The study was conducted at three different flow rates and generated effluent quality data for each stage given in the table below. Use these experimental data to determine the values of the two constants P (mg/ft 2d) and K s (mg/l). Q, l/d S1, mg/l BOD 5 S2, mg/l BOD 5 S3, mg/l BOD 5 S4, mg/l BOD 5 10 108 64 52 28 15 120 78 59 45 20 130 88 65 50 Problem 2 A three-stage rotating biocontactor system is to be designed to treat a wastewater flow of 0.1 MGD with a strength of 250 mg/l BOD 5. A treatability study revealed a P = 2500 mg/ft 2day and a K s = 100 mg/l. Compute the area requirements if an effluent having a BOD 5 of 15 mg/l is desired. Problem 3 Design a RBC plant to treat a wastewater flow of 1 MGD. Pertinent data are: influent BOD 5 = 200 mg/l; desired effluent BOD 5 ≤ 20 mg/l; number of stages = 3; k = 1.15 gal/d/ft 2. Use the graphical method to determine: 1) the design hydraulic loading (gpd/d/ft 2); 2) the BOD 5 after each stage (mg/l); 3) the disk area per stage (ft 2); 4) the total disk area (ft 2). Problem 4 Pb. 9-1 Textbook (flowrate 390 m 3/h) Problem 5 A primary effluent with Q = 1.0 MGD, BOD 5 = 138 mg/l, and SS = 104 mg/l is treated by a single stage tricking filter with the following characteristics: 6 feet deep rock trickling filter media; design BOD loading of 50 lb/day/1000 ft 3; design hydraulic loading of 0.30 gpm/ft 2; recirculation ratio of 1.5. Determine: 1) the volume (ft 3) and diameter (ft) of the trickling filter; 2) the effluent BOD concentration. Problem 6 An experimental trickling plastic media filter operated for the purpose of establishing values for the treatability factor K and the media constant n produced the following results: Hydraulic loading, m 3/m 2d  25 35 40 Depth, m Effluent BOD 5 , mg/l 0 220 220 220 2 90 115 160 4 56 68 130 6 20 34 55 8 15 22 38 10 10 14 25 Use the data given above and the Germain-Schultz equation = A T L :− - & / 3 ; and determine the values of K (m/d) nm -1 and n (show all work).