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Stone media TF design

Stone media TF design. Example 1 Calculate the BOD loading, hydraulic loading, BOD removal efficiency, and effluent BOD concentration of a single-stage trickling filter based on the following data: Design assumptions: Influent flow =1530 m 3 /d Recirculation ratio = 0.5

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Stone media TF design

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  1. Stone media TF design • Example 1 • Calculate the BOD loading, hydraulic loading, BOD removal efficiency, and effluent BOD concentration of a single-stage trickling filter based on the following data: • Design assumptions: • Influent flow =1530 m3/d • Recirculation ratio = 0.5 • Primary effluent BOD = 130 mg/L • Diameter of filter = 18 m • Depth of media = 2.1 m • Water temperature =18oC

  2. Stone media TF design Solution) (1) BOD loading rate (kg/m3/d) • BOD load = BOD Conc. x Influent flow = 130 mg/L x 1530 m3/d =198.9 kg/d • Volume of filter = surface area of filter x depth = π(18 m x 18m)/4 X 2.1 m = 533 m3 • BOD loading rate = BOD load / volume of filter =0.37 kg/m3/d

  3. Stone media TF design Solution) (2) Hydraulic loading rate (m3/m2/d) • Total flow to the media = influent + recirculation flow = 1530 m3/d + (1530 m3/d x 0.5) • Surface area of filter = π(18 m x 18m)/4 = 254 m3 • Hydraulic loading rate = Total flow to the media / area of filter = 9.04 m3/m2/d

  4. Stone media TF design Solution) (3) Effluent BOD (mg/L) • BOD removal efficiency for first-stage filter at 20oC, %

  5. Stone media TF design • Example 2 • A municipal wastewater having a BOD of 200 mg/L is to be treated by a two-stage trickling filter. The desired effluent quality is 25 mg/L of BOD. If both of the filter depths are to be 1.83 m and the recirculation ratio is 2:1, find the required filter diameters. Assume the following design assumptions apply. • Design assumptions: • Influent flow =7570 m3/d • Recirculation ratio = 2 • Depth of media = 1.83 m • Water temperature =20oC • BOD removal in primary sedimentation = 35% • E1=E2 =0.65

  6. Stone media TF design • Example 2 BOD=200mg/L BOD=25mg/L Primary Clarifier Secondary Clarifier TF1 TF2

  7. Stone media TF design Solution) (1) Compute the recirculation factor = (1+2)/ (1+0.2)2 = 2.08

  8. Stone media TF design Solution) (2) Compute the BOD load for the first filter • BOD load = BOD Conc. x Influent flow = 200mg/L*(1-0.35) x 7570 m3/d =1234kg/d (3) Compute the volume for the first stage • V= 388 m3

  9. Stone media TF design Solution) (4) Compute the diameter of the first filter A= V/depth = 388 m3/1.83m = 212 m2 Diameter = 16.4 m (5) Compute the BOD load for the second filter • BOD load to the second filter = (1-E1) x BOD load to the first filter = (1-0.646) x 1234 kg BOD/d = 437 kg BOD/d

  10. Stone media TF design Solution) (6) Compute the volume for the first stage • V= 1096 m3 (7) Compute the diameter of the first filter A= V/depth = 1096 m3/1.83m 599 m2 Diameter = 27.6 m

  11. Stone media TF design Solution) (8) Compute the BOD loading to each filter (9) Compute the hydraulic loading to each filter

  12. Plastic media

  13. Plastic media Schulze formula • The liquid contact time(t) of applied wastewater Where: t = liquid contact time, min D= depth of media (m) q = hydraulic loading, (m3/m2/h) C, n = constants related to specific surface & configuration of media

  14. Plastic media • hydraulic loading (q) Where: Q= influent flow rate L/min A=filter cross section area m2

  15. Plastic media TF design Schulze formula Where: Se= BOD concentration of settled filter effluent, mg/L So= influent BOD concentration to the filter, mg/L k=wastewater treatability and packing coefficient, (L/s)0.5/m2 D=packing depth, m q= hydraulic application rate of primary effluent, excluding recirculation, L/m2*s n=constant characteristic of packing used (assumed to be 0.5).

  16. Plastic media TF design • Example 3 • Given the following design flow rates and primary effluent wastewater characteristics, determine the following design parameters for a trickling filter design assuming 2 reactors at 6.1 m depth, cross-flow plastic packing with a specific surface area of 90 m2/m3, a packing coefficient n value of 0.5, & a 2-arm distributor system. The required minimum wetting rate=0.5L/m2*s. Assume a secondary clarifier depth of 4.2m and k value of 0.23. • Design conditions

  17. Plastic media TF design • Example 3 • Calculate the followings • Diameter of TF, m • Volume of packing require, m3

  18. Plastic media TF design • Solution • (1) Diameter of tower trickling filter, m • Correct k for temperature effect

  19. Plastic media TF design Solution • (1) Diameter of tower trickling filter, m • Determine the hydraulic loading rate • Determine the tower area • Determine the tower diameter

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