Tertiary optimisation of an existing WWTP: compact and high-performance solution even in bad weather
Compact, modular and designed to stabilize MES compliance even in rain, this lamella + drum filter solution offers a modern approach to tertiary treatment. Easy to integrate, simple to operate and suitable for constrained sites or combined networks, it secures your water quality without heavy work or oversizing.
Project information
- Sancy (FR-54450)
- 2022
- Key technologies
- Capacity
500 PE
Nominal
- Lamella clarifier
Gravity clarification
Stabilizes dry processing and reduces suspended solids.
- Box Drum Filter
Tertiary Polishing
Captures fine particles during rainfall peaks.
- Modular integration
Small footprint
Simplified transport, quick installation and optimised operator access.
Project Background
Your station had to meet strict MES standards, including during rainy episodes. The existing installation – screening + primary clarifier – was fed by an old combined network where wastewater and rainwater mix.
During bad weather, the flow rates increased sharply, making the line unstable and compliance difficult to maintain.
Objectives
Implement a compact, reliable and cost-effective solution for:
- maintain MES compliance during dry and rainy periods,
- avoid any oversizing of the structures,
- simplify integration (transport, installation, space),
- ensure robust and scalable operations.
Technical solution
The solution implemented combines:
- a lamella clarifier for gravity clarification and solid-state stabilization in the dry regime;
- a box drum filter for tertiary polishing in the event of rainfall flow peaks.
The box protects the equipment, reduces the footprint and can be completely buried.
The assembly is modular, ready to connect, and allows for quick commissioning.
CNC prefabrication & modularity
- Separable modules, allowing transport and installation in a small space.
- Limited connections to reduce installation times.
- Integration designed for rain variability and handling constraints.
- Scalable architecture allowing for the addition of equipment or future expansions.
On-site implementation
- Simplified transport thanks to independent modules.
- Quick installation in a constrained area.
- Minimized hydraulic and electrical connections.
- Hydraulic speed adjustment, drum commissioning, purge plan and operating procedures given to the teams.
Results
- Stabilised MES, including in rain.
- Proven efficacy: 5 to 10 mg/L for a flow rate of 11 m³/h.
- Effective clarification + regular polishing = secure compliance.
- No need for heavy civil engineering work.
- Robust, flexible and economical operation.
Operation & Maintenance
- Simple control: hydraulic speeds / rotation, turbidity monitoring, purge plan.
- Easy access thanks to the box: cleaning, visual checks, quick maintenance.
- Compact line suitable for constrained sites or combined networks.
- Scalable solution if volumes or operating conditions change.
Key figures
- 500 PE — nominal capacity of the station
- Lamella + drum — double tertiary treatment stage
- 5–10 mg/L suspended solids — performance measured at the outlet
- Compact installation — separable modules & quick installation
- Optimized costs — no oversizing, no heavy civil engineering
Product focus: Tertiary lamella treatment + drum filter
To secure MES compliance without oversizing the plant, we combine a lamella clarifier for gravity clarification and a box drum filter for tertiary polishing.
In dry conditions, the lamella stabilizes the line; In rainy conditions, the drum takes over and captures residual particles, even at high flows.
Compact, modular and ready to connect, the solution can be easily integrated into existing structures and limits civil engineering work while remaining simple to operate.
- Rain Polishing
- Box Drum Filter
- Small footprint
- Integration on unit networks
- Fast & scalable installation
-
Aquaculture channel drum filter
Filtering
Steps to collaborate
- Diagnosis of the plant — analysis of dry/rainfall flows, suspended solids, combined network constraints.
- Dimensioning of tertiary treatment — lamella surface, drum mesh, management of peak flows.
- Preparation & logistics – separable modules, housing, simplified transport and limited connections.
- Installation & commissioning – hydraulic/rotation adjustments, purge plan, operating procedures.
- Monitoring & optimization — support at start-up and adjustment of operating instructions.
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