Description of Technology:
The method combines the benefits of attached growth biomass (the main processes takes place in the biofilm) with suspended-growth biomass (uses the entire available volume of the bioreactor).
The biofilm grows in special biocarriers, that remain in the bioreactor using special devices (gratings).
Comparison of basic design-operation parameters:
| Activated sludge | M.B.B.R. | |
| Typical biomass concentration in the bioreactor | 3-5 kg/m3 | 0,25-0,5 kg/m3 |
| Typical values of Sludge Volume Index(SVI) | 125-150ml/gr | <50ml/gr |
| Typical value of max surface hydraulic load of sedimentation tanks | 1 m/hr | 1,8 m/hr |
| Biomass concentration retention | Via sludge recirculation | Through biocarriers |
Advantages:
The method of “Moving bed bio reactor – MBBR has developed greatly over the last 10 years mainly due to the small footprint, but counts additional advantages over the conventional extended aeration:
- Increased flexibility in hydraulic fluctuations
- Reduced energy requirements
- Significant reduction of excess sludge produced
- Excess sludge with much higher settleability index
- Smaller footprint and lower requirements for mixed liquor separtion
- Significant reduction of amounts of sludge for disposal => reduce operational costs
- No requirement for sludge recirculation => reduction in capital and operational costs
MESOGEOS applies this method for:
- Construction of new wastewater treatment plants with small available area
- Extensions of existing wastewater treatment plants with limited area
- Construction of new WWTP for small settlements with large seasonal variations compact MBBR systems.
Case Study:
METAGITSI WWTP, SITHONIA MUNICIPALITY, HALKIDIKI
Installation of an urban wastewater treatment plant with capacity 1,800 pe and includes the following sub-units:
- Compact pretreatment unit
- Equalization tank and pumping station
- Two independent compact MBBR treatment units
- Filter
- Chlorination – dechlorination effluent and disposal and reuse for irrigation
Project Data :
| Budget | 1.332.200 € |
| Influent | Municipal wastewater |
| Capacity | 1.800 pe |
| 346 m3/day | |
| Influent organic load | 108 kg BOD/day |
| 312 mg/l | |
| Effluent quality | BOD = 15 mg/l |
| TSS = 15 mg/l | |
| TN = 10 mg/l | |
| Waste sludge produced | 40 tn SS/year |
| Biological stage | Compact M.B.B.R. |
| Number or installed units | 2 |
| Model | UW-CHEM 200 M.B.B.R. |
| Dimensions | 12,20m x 2,40m x 2,90m |