Sizing a plant to your flow and standard.
Selection is driven by two loads — hydraulic flow and organic load — and constrained by the discharge standard you have to meet. Send us the inputs below and we return a sized configuration.
What we need to size your plant
- Daily flow (m³/day)
- Peak flow factor
- Influent characteristics: COD, BOD₅, TSS, NH₃-N, oil & grease, pH, temperature
- Target discharge standard
- Reuse intent (irrigation, flushing, or discharge only)
- Power supply (V / Hz / phase)
- Climate and ambient temperature range
- Available footprint
- Discharge point (receiving water body, soakaway or sewer)
- Site access for container delivery
How the sizing works
- 1Size on hydraulic load. Daily flow and peak flow factor set the hydraulic residence time and the tank volumes.
- 2Size on organic load. COD and BOD₅ set the biological capacity; this often governs the plant size for high-strength wastewater such as food processing.
- 3Convert to containers. Required capacity ÷ capacity of one container = number of containers. Capacity of one container: [to be confirmed with factory].
- 4Fix the process train. A/O or MBBR, with or without MBR, follows from the discharge standard and the reuse intent.
- 5Check the site. Footprint and access decide whether the plant arrives as a single container or as a linked train.
Containerized plant vs on-site civil construction
| Aspect | Containerized plant | On-site civil construction |
|---|---|---|
| Where it is built | Shop-fabricated | Built on site |
| On-site installation work | Minimal — foundation, piping, power, commissioning | Extensive — civil, structural and mechanical/electrical works |
| Footprint | Compact, on a small concrete pad | Larger, with fixed basins |
| Relocatability | Can be moved to another site | Effectively fixed |
| Future expansion | Add containers as the flow grows | Requires new civil works |
| Quality control | Assembled and tested under workshop conditions | Depends on site conditions and supervision |
| Civil works required | Minimal | Extensive |
Skid-mounted vs containerized vs civil works: which one ships
Example of the inputs we ask for
Replace each placeholder with your own value.
| Daily flow | [your value] m³/day |
|---|---|
| Peak flow factor | [your value] |
| Influent COD | [your value] mg/L |
| Influent BOD₅ | [your value] mg/L |
| Influent TSS | [your value] mg/L |
| Discharge standard | [your value] |
| Power supply | [your value] V / Hz / phase |
| Available footprint | [your value] m² |
Vertical selection guides
Three vertical guides take the same selection method into the constraints that appear most often in a project.
Remote and island sites
off-grid power, sea and barge logistics, seasonal access, camps and facilities far from a sewer.
Food and beverage processing
high organic load, fats, oils and grease, solids, batch flow and pH swings.
Sludge dewatering
thickening, cake dryness, press type, footprint and disposal route.
Look-up charts behind the sizing method
The method above runs on a set of selection charts — population to capacity, peaking factor Kz, container loading, influent quality, effluent standards to process train, and tank volume with HRT. Every figure is labelled with the standard or statistic it comes from.