Optimization of a reed station with MBBR module (400–800 PE)
Integration of an MBBR module between the two stages of a reed die in order to stabilize nitrification all year round. Compact, scalable and easy to operate, the solution enhances performance without modifying existing structures and secures the station’s compliance in the long term.
Project information
- Savigny (CH-1094)
- 2024
- Keywords
- Capacity
500 PE
Integration range of the interstage MBBR module
- Nitrogen treatment
Enhanced nitrification
Interstage MBBR module optimized ≥ 12 °C
- Reed die
2 stages of treatment
Integration without modification of structures
- Controlled ventilation
Controlled consumption
Flow & season settings
Project Background
A two-stage reed station had insufficient nitrification, particularly in cold periods, with a risk of nitrogen non-compliance. The objective was to improve performance without modifying existing structures or undertaking major works, while preserving the green architecture of the sector.
Objectives
Sustainably strengthen nitrification, stabilize year-round performance and maintain regulatory compliance, particularly on nitrogen and phosphorus. The solution had to be compact, scalable and discreetly integrated between the two reed floors.
Technical solution
Addition of an inter-stage MBBR module receiving pre-filtered water from the first stage: better oxygenation, carbon load management and nitrification acceleration. The system is sized for water temperatures ≥ 12 °C and for loads of 400 to 800 PE.
CNC prefabrication & modularity
Compact, prefabricated module that can be adjusted to the existing die. Quick installation thanks to lightweight design, simple hydraulic interfaces and limited connections. The modular format allows volumes, aeration and media to be adapted according to changing flow rates.
On-site implementation
Installation of the MBBR between the two floors: installation of the tank, hydraulic connection in bypass, integration of ventilation and instrumentation to monitor temperatures and flows. Intervention without major disruption of the reed sector.
Results
Nitrification > 90% during favourable periods, stability of the treatment despite variations in flow rate and maintenance of compliance, including on phosphorus. The whole remains consistent with the vegetated sector, without overconsumption of energy.
Operation & Maintenance
Simple control of ventilation and carbon load, automated monitoring of instructions according to temperature and season. Easy maintenance thanks to the inter-stage access, compact equipment and autonomous operation of the MBBR.
Key figures
- 400–800 PE — integration capability
- > 90% nitrification — in good times
- ≥ 12 °C — thermal control threshold
- Compact & modular — inter-stage installation without heavy work
- Phosphor compliance — maintaining overall performance
Product Focus: Interstage MBBR Module
To strengthen the nitrification of a reed die without modifying the existing structures, we integrated a compact and modular MBBR module between the two stages.
Receiving water already clarified by the first level, this module benefits from more efficient oxygenation, optimised control of the carbon load and a significantly higher nitrogen yield, even in cold periods.
With its adjustable volume, high-surface media and regulated aeration, it improves nitrification while remaining simple to operate. Its inter-storey integration limits the footprint on the ground, avoids heavy work and maintains the coherence of the vegetated sector.
Compact and scalable, the MBBR can be sized for 400 to 800 PE, with temperature-based seasonal adjustment (threshold ≥ 12 °C), ensuring stable nitrification and long-term compliance.
- Enhanced nitrification
- Cross-floor integration
- Controlled ventilation
- High-surface media
- Compatible with reed die
- Compact & scalable
Steps to collaborate
- Reed die analysis — flow rates, water temperatures, NH₄⁺/NO₃⁻ loads and seasonal performance.
- MBBR preliminary design — useful volume, media, ventilation, inter-stage integration and carbon control.
- Manufacturing & Logistics — compact prefabricated module, supports, ventilation and instrumentation.
- On-site installation — installation between the two floors, hydraulic connections, integration without heavy work.
- Testing & commissioning – ventilation adjustments, thermal thresholds, optimization of seasonal setpoints.
- Support & follow-up — training, performance monitoring and adjustments according to load variations.
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Outdoor MBBR 5NE-M.NE-S
Biological treatment
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