The Client
The biggest beer producer in Portugal located in Leça do Balio, close to the city Oporto in Portugal, operates a beer and softdrinks production facility. Because of the limited amount of space on the brewery's site, anaerobic treatment is a good solution for treatment of the wastewater. The present anaerobic Biobed® EGSB reactor can treat up to 19.800 kg of COD and 12.600 kg of BOD per day, in a reactor with a surface area of only 113m3.
|
Raw Wastewater Characteristics (before pre-treatment) |
System Features | ||
|---|---|---|---|
| Flow | 6.000 m3/d | Pre-treatment | |
| COD Load | 19.800 kg/d | 2 buffer tanks |
1.230 m3 1230 m3 |
| TSS | 1.000 mg/l | ||
| TKN | 80 mg/l | Conditioning Tank | 56 m3 |
| PO4 | 20 mg/l | ||
| pH-value | 6 - 13 | Biobed® EGSB | 1.320 m3 |
| Temperature | 23 - 35°C | Post-treatment | Existing |
Treatment Process
Wastewater arriving from the brewery is passing screens and a tilted plate seperator (TPS) for grains and kieselguhr removal. After pre-treatment, the wastewater is collected in buffer tanks. The wastewater is thus fed to the conditioning tank and the anaerobic Biobed® EGSB reactor, in which a large part of the COD is converted into biogas.
The wastewater is post-treated in an aerobic sequencing batch reactor, to remove residual BOD, COD and nutrients. With a final effluent concentration of TCOD < 150 ppm, the wastewater is discharged to Leça river.
Performance
Since its start-up in summer 2007, the Biobed® EGSB reactor removes on average 80% of TCOD from the wastewater.
Process Flow Diagram
