Recommendations
Septic tank project - SALUTAR dimensionsAnaerobic reactorSpecification for blowersHead loss coefficient applicable to partially open angle valveNusselt's numberUASB cylindrical D = 2,40 m; V = 23,28 m³

UASB check-list: hydraulic parameters

Input data

Average influent flow

Maximum influent flow

Peak influent flow

Base reactor area

Total reactor volume

Total settling volume

Acess to settling compartments total area

Settling compartmente total superficial area

Number of distributing pipes to the bottom of the reactor

Output data

Hydraulic volumetric loading ratecorresponding to average flow - see Note 1

Hydraulic volumetric loading ratecorresponding to maximum flow - see Note 2

Hydraulic volumetric loading ratecorresponding to peak flow - see Note 3

Hydraulic detention timecorresponding to average flow - see Note 4

Hydraulic detention timecorresponding to maximum flow - see Note 5

Hydraulic detention timecorresponding to peak flow - see Note 6

Superficial velocitycorresponding to average flow - see Note 7

Superficial velocitycorresponding to maximum flow - see Note 8

Superficial velocitycorresponding to peak flow - see Note 9

Velocity in the acess passages to the settling compartmentscorresponding to average flow - see Note 10

Velocity in the acess passages to the settling compartmentscorresponding to maximum flow - see Note 11

Velocity in the acess passages to the settling compartmentscorresponding to peak flow - see Note 12

Surface loading rate in the settling compartmentscorresponding to average flow - see Note 13

Surface loading rate in the settling compartmentscorresponding to maximum flow - see Note 14

Surface loading rate in the settling compartmentscorresponding to peak flow - see Note 15

Hydraulic detention time in the settling compartmentscorresponding to average flow - see Note 16

Hydraulic detention time in the settling compartmentscorresponding to maximum flow - see Note 17

Hydraulic detention time in the settling compartmentscorresponding to peak flow - see Note 18

Influence area of each distribution pipe at the bottom of the reactor - see Note 19

Description

Given the average, maximum e peak influent flows to the reactor and its basic geometric charateristics, calculates the volumetric hydraulic loads, the hydraulic detention times, the superficial velocities, the velocities in the acess to the settling compartments, the superficial loading rates and the detention times in these chambers and the influence area of each distribution pipe, allowing to compare these values with prof. Chernicharo recommendations.

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Notes

Values recomendaded by Chernicharo

  1. Hydraulic volumetric loading rate corresponding to average flow, m³ / (m².d): < 4
  2. Hydraulic volumetric loading rate corresponding to maximum flow, m³ / (m².d): < 6
  3. Hydraulic volumetric loading rate corresponding to peak flow, m³ / (m².d): < 7
  4. Hydraulic detention time corresponding to average flow: 6 to 9
  5. Hydraulic detention time corresponding to maximum flow: 4 to 6
  6. Hydraulic detention time corresponding to peak flow: 3.5 to 4
  7. Superficial velocity corresponding to average flow, m/h: 0.5 - 0.7
  8. Superficial velocity corresponding to maximum flow, m/h: 0.9 -1.1
  9. Superficial velocity corresponding to average flow, m/h: < 1.5
  10. Velocity in the access passages to the settling compartments corresponding to average flow, m/h: 2.0 - 2.3
  11. Velocity in the access passages to the settling compartments corresponding to maximum flow, m/h: 4.0 - 4.2
  12. Velocity in the access passages to the settling compartments corresponding to peak flow, m/h: 5.5 - 6.0
  13. Surface loading rate in the settling compartments corresponding to average flow, m/h: 0.6 - 0.8
  14. Surface loading rate in the settling compartments corresponding to maximum flow, m/h: 1.2
  15. Surface loading rate in the settling compartments corresponding to peak flow, m/h: 1.6
  16. Hydraulic detention time in the settling compartments corresponding to average flow, h: 1.5 - 2.0
  17. Hydraulic detention time in the settling compartments corresponding to maximum flow, h: > 1.0
  18. Hydraulic detention time in the settling compartments corresponding to peak flow, h: > 0.6
  19. Influence area of each distribution pipe at the bottom of the reactor, m²: 2 - 3

References

  • Chernicharo, Carlos A. de L. Reatores anaeróbios. Belo Horizonte, DESA EEUFMG, 1997