Biological treatment
BIODEC™
Decanters, 100–3,650 m³/h: stainless S range and composite C range.
BIODEC is a scum- and solids-excluding, air-actuated decanter. It incorporates all the advantages of a submerged-weir decanter, peak handling capability, while retaining the operational simplicity and straightforward build of air-actuated decanters.
BIODEC SBR decanters have only one moving part: a simple, small-diameter three-way motorized ball valve. The vertical movement of the decanter is achieved by injecting or releasing pressurized air into the body of the decanter. Decanter levels can be adjusted easily on site to suit local conditions. This air-powered decanter can be driven by the plant's own aeration system, eliminating the need for any complex equipment.
Download the BIODEC brochureHow it works
The process
Compressed air alone moves the decanter. Injecting air into the floating body lifts it clear of the water; releasing the air lets it sink. During decantation it descends with the falling water level, and because the pipe sections break the surface first, floating scum and solids are excluded before the weir reaches the water, so only clear water leaves the tank. At the plant's top water level the decanter doubles as a safety overflow.
Specifications
| Decanter types | 2: floating and fixed-arm |
| Models | 8 (C, P, S100–S600) |
| Decanting capacity | 100–3,650 m³/h per unit |
| Moving parts | One: DN25 three-way ball valve |
| Actuator | +GF+ EA25 electric |
| Compressed air (S series) | 300 l/min at 0.03 bar |
| Head constraint | H = ΔH + Hmin ≤ 3 m, Hmin ≥ 0.5 m |
| S100 / S150 / S200 at H=2.5 m | 100 / 240 / 430 m³/h |
| BIODEC C | > 400 m³/h per unit, groupable, DN200 PN10 |
| Construction | Stainless S range, composite C range |
Key advantages
- Only one moving part, a three-way motorized ball valve
- Driven by the plant's existing aeration system
- Submerged-weir peak handling capability
- Scum and solids exclusion
- Levels adjustable on site
- Compatible with any SBR plant
- Driven by the plant's own aeration system
- Scum and solids excluding
- Safety overflow function at maximum water level
- Corrosion-resistant stainless or composite construction
Gallery
Where it is applied
- SBR and cyclic processes
- Retrofit to any existing SBR
- S 100–200: compact square float on a basin-edge frame
- S 300–600: twin parallel float tubes, straight weir
- C: composite, circular, modular and relocatable
Case studies
Written up with commissioning data, influent and effluent.
Reference plants
The largest 8 of 75 plants delivered with BIODEC, 2011–2026.
| Plant | Location | Capacity | Year | Process |
|---|---|---|---|---|
| Debrecen | Debrecen, Hungary | 12,000 m³/day | 2026 | BIODEC S 600 ×2 |
| Szentes | Szentes, Hungary | 7,380 m³/day | 2014 | BIODEC S 400 ×4 |
| Kall Ingredients (Tisza-TK) | Tiszapüspöki, Hungary | 5,500 m³/day | 2015 | BIODEC S 200 ×4 |
| Ózd | Ózd, Hungary | 5,400 m³/day | 2014 | BIODEC S 200 ×8 |
| Kiskunhalas | Kiskunhalas, Hungary | 4,290 m³/day | 2012 | BIODEC S 200 ×6 |
| BYD Auto Hungary Kft. | Szeged, Hungary | 3,000 m³/day | 2025 | BIODEC-C ×2 |
| BYD Auto Hungary Kft. | Szeged, Hungary | 3,000 m³/day | 2024 | BIODEC-C ×2 |
| Tolna | Tolna, Hungary | 2,500 m³/day | 2013 | BIODEC S 200 ×4 |
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