Design and Calculation UASB Reactor for Sludge Treatment

3

kg COD /m /d kg COD/d 2

9.8 m /s 0.002 m 3 1020 kg/m

g dp ρp

settling

m 2

980 kg/m 0.001002 kg/m/s 2 1.02245E-06 m /s 0.09 m/s 5.22 m/min 312.97 m/h velocity up 68.53% % 0.00059581 m/s F COD

20 40 800

Limit 2500 Required Conversion

μ/ρ

40000

mg/L

40000

μ/ρ

v

m

H D:H Base Area velocity

6 2.38 160.00 0.13 0.0021 0.0000

m Desired 2 =πD /4 2 =F/(πD /4)

recycle ratio recycle ratio

(based on % of settling velocity) (based on minimum fluidization velocity) F π D2 F/(πD2/4)

17.16 1.459144 20 3.142 203.6919 0.125

g/m

3

TRIAL CALCULATION g dp

9.8

m2/s

0.025

m/s Ns/m2

ρp

1500

m kg/m3

ρm

994

kg/m3

m2/s

μ

0.000693

kg/m/s

=

0

m/s

μf

14.27

mg/L 93.75% kg/m3

u Dp

960.00

D

3

m /h 3 kg COD/m kg COD/hr

ρuD/μ

Re ρf

3

mm

3

ρm μ v velocity

20 19200

3 (ρfumf2/Ф (ρspD -ρpfє)g mf )*(150(1-єmf)μf/(ФfDpumfρf)+1.75)

(ρp-ρf)g

4958.8

єmf

0.425 3 Фsєmf 1/14 Фs 0.930475997 1.75(ρfumf2/ФsDpєmf3) 2

150(1-єmf)μfumf/(Фs Dp2єmf3) B=

B=

960400

umf2

+

umf 0.059580968 m/s 0.000524 Goal Seek B=0 By Changing C45

26006.37 OK

960400

umf2

26006.37

umf

umf

-

4958.8

(4V /π H) 2 2 m m/h m/min m/sec

1/2

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