Cold-water design
Cold mixed liquor raises viscosity and slows biology, so winter is usually the design condition for flux. Conservative flux, adequate membrane area and insulated or indoor installations help keep winter performance stable. We size for your coldest month using our design guidance and temperature correction.
Remote and northern sites
For fly-in or long-haul sites, easy-to-handle parts are important. Swing cartridges are relatively light, ship and store dry, and can be stocked as spares on site. See remote camps and First Nations communities.
Working with Canadian teams
We work with Canadian engineers, integrators and operators, provide datasheets and drawings, and quote modules and replacement membranes. Rentals are currently offered for US projects only.
| Mild backwash (special cases only) |
|---|
| Backwashing is not a standard Swing operating mode and is not meant for routine use. Swing has been pressure-tested to 14.5 psi (1 bar) and held without breaking. If a site is in a bind even after relaxation and CIP, contact us; we may be able to work out a special mild-backwash procedure. |
Worked sizing example
Take a northern community plant at 105,669 gpd (400 m³/day) with 46 °F (8 °C) winter mixed liquor:
| Item | US | Metric | Note |
|---|---|---|---|
| Average flow | 105,669 gpd | 400 m³/day | about 73 gpm (16,667 L/h) |
| Design flux (gross) | 8.8 gfd | 15 LMH | Zyramic design guidance |
| Derate for relaxation and cleaning | ~20% | ~20% | |
| Net flux | ~7.1 gfd | ~12 LMH | |
| Membrane area needed | ~14,950 ft² | ~1,389 m² | average flow ÷ net flux |
| Swing-8 cartridges | ~112 | ~112 | 135 ft² (12.5 m²) each |
| Peak factor | ~2.5 | ~2.5 | |
| Peak flow | ~264,172 gpd | ~1,000 m³/day | extra area, short-term higher flux, or equalization |
This is an illustration only; a real design also checks temperature, MLSS, redundancy and the cleaning schedule.
Tips for a smooth project
- Compare modules on lifecycle, not area alone
- Plan how replacement parts will be sourced later
- Allow room for handling and inspection
- Check cassette dimensions before ordering replacements
Next step
A good way to see which design choices matter most for your plant is to look at your own maintenance history. Tell us what has needed attention in the past, and we will explain which of our options fits it best.
Sizing considerations
To give a useful recommendation we usually need:
- Province and site access
- Coldest mixed liquor temperature
- Flow and effluent limits
- Retrofit or new
- Spare parts strategy
Most relevant product: Swing MBR. See also replacement membranes, rentals and how to choose.
Why engineers look at Zyramic flat-sheet modules
| Item | Details |
|---|---|
| Smaller sheets, less wear and tear | each sheet flexes less in service, and a damaged unit affects less area. |
| Strong wide membrane welds | designed to resist delamination over the membrane's life. |
| Thick, robust membrane | about 250 microns including support. |
| Assembled in Poughkeepsie, NY | of domestic and imported components. In our Poughkeepsie shop we cut and weld membrane sheets to plates, build module frames and assemble complete modules. For funded projects, tell us your domestic-content requirements and we'll review what we can document. |
| Buy, rent or replace | new modules, rentals and pilots for US projects, and replacement membranes that fit many existing cassettes. |
Performance and life depend on pretreatment, design flux and operation; flux figures are Zyramic design guidance, sized to each project.
Frequently asked questions
Do you ship to Canada?
Yes, modules ship to Canadian projects by freight.
Are rentals available in Canada?
Not at present; rentals are for US projects.
Do you support French-language documents?
Tell us your documentation needs when you request a quote.
Do you have a Canadian representative?
We are building our representative network; contact us directly in the meantime.
What effluent standards do you design for?
We design to the limits your engineer specifies for the project.
Do you have documentation for procurement content rules?
Our modules are assembled in the USA of domestic and imported components. Tell us your content requirements and we'll review what we can document.