Upflow fixed bed multiple inputs anaerobic filter
Input data
Colder month average temperature
Compensation rate for the occupied volume by the support media - see note 1
Contribution type - see Table 1
Number of contributors - see Table 1 for contributor tipification
Anaerobic filter effective height
Filter plan shape
Output data
Effluents contribution flow
Effluents detention time
Useful volume
Filter superficial area
Filter diameter
Minimum inlet pipes number
Description
This calculation is indicated for filters with superficial area greater than 3 m²
Given the temperature, the contribution type, the number of contributors, the geometry and effective height of the anaerobic filter, calculates its useful volume and superficial area.
Circular multiple inlets anaerobic filter
Note:
- Use 1.6 if this value is not defined.
Table 1: Daily effluent contribution per unit
| Contribution type | Unit | Effluent contribution (q)¹ [L/unit.day] | Fresh sludge (Lf)² [L/unit.day] |
|---|---|---|---|
| 1 - Permanent Occupants | |||
| High standard | Person | 160 | 1 |
| Medium standard | Person | 130 | 1 |
| Low standard | Person | 100 | 1 |
| Hotel (except laundry and kitchen) | Person | 100 | 1 |
| Hotel with kitchen and laundry, except bathtub | Person | 240 | 1 |
| Hotel with kitchen, laundry and bathtub | Person | 360 | 1 |
| Temporary accommodation | Person | 80 | 1 |
| Orphanage - asylum | Person | 120 | 1 |
| School (boarding school) | Person | 150 | 1 |
| Presidium | Person | 240 | 1 |
| Barracks | Person | 120 | 1 |
| Rural area | Person | 100 | 1 |
| 2 - Temporary occupants | |||
| Factory in general | Person | 70 | 0.30 |
| Office | Person | 50 | 0.20 |
| Public or commercial building | Person | 50 | 0.20 |
| Part-time schools | Person | 50 | 0.20 |
| Full-time schools | Person | 100 | 0.30 |
| Daycare center | Person | 50 | 0.20 |
| Restaurant and similar | Person | 25 | 0.10 |
| Cinema, theater, temple, church and short-stay places | Place | 2 | 0.02 |
| Ambulatory | Person | 25 | 0.20 |
| Railway, bus and subway station | Passenger | 25 | 0.20 |
| Public toilet | Toilet | 480 | 4.00 |
Notes:
- ¹ Effluent contribution (sewage)
- ² Fresh sludge contribution
- Applied to local treatment systems with maximum daily flow up to 12000 liters per day and total organic load up to 3.80 kg BOD / day, for installations in which there are differential conditions of execution, operation and maintenance, when compared to medium and great size sewage treatment systems, usually implanted in projects which are not served by sanitary sewage systems, in distant locations.
Collecting gutter detail
References
- Associação Brasileira de Normas Técnicas. NBR 17076 - Projeto de sistema de tratamento de esgoto de menor porte - requisitos. Rio de Janeiro, ABNT, 2024.