20kg COD/d 19200

g 9.8 960.00

0.002 m 2 mm

1020 D 14.27 m

980 H 6 mμ 0.001002 kg/m/s D:H 2.38 Desired 2

v 1.022449E-06 μ/ρ Base Area 160.00

settling velocity 0.09 m/s velocity 0.13 m/h5.22 m/min 0.0021 m/min

312.97 m/h 0.0000 m/secvelocity up 68.53% %

0.0005958097 m/s recycle ratio (based on % of settling velocity) 17.16recycle ratio (based on minimum fluidization velocity) 1.4591444

F 20 F 20

COD 40 40000 mg/L 40000 π 3.142

800 kg COD/hr 203.69192

0.125Limit 2500 mg/L

Required Conversion 93.75%

Re ρuD/μ TRIAL CALCULATION

g 9.8

u m/s 0.025 m

m/s 1500

994

v μ/ρ μ 0.000693 kg/m/s

4958.8

0.425

1/14Фs 0.9304759966

960400

26006.37

B= 960400 + 26006.37 - 4958.8 = 0

0.0595809679 m/s OKB= 0.000524Goal Seek B=0 By Changing C45

kg COD /m3/d

m2/s m3

dp

ρp kg/m3 (4V /π H)1/2

ρm kg/m3

m2/s =πD2/4 m2

=F/(πD2/4)

m3/h

kg COD/m3 g/m3

D2

F/(πD2/4)

ρf kg/m3 m2/s

dp

Dp ρp kg/m3

μf Ns/m2 ρm kg/m3

m2/s

(ρp-ρf)g(ρfumf2/ФsDpєmf

3)*(150(1-єmf)μf/(ФfDpumfρf)+1.75)

(ρp-ρf)g

єmf

Фsєmf3

1.75(ρfumf2/ФsDpєmf

3) umf2

150(1-єmf)μfumf/(Фs2Dp

2єmf3) umf

umf2 umf

umf

100

90

80

70% conversion

60

50

40

30

20

10

0

0 10 20 30 40 50 60 70

80 kg COD/m3/d