Why leachate is difficult
Young leachate has high biodegradable COD; older leachate is dominated by ammonia and hard-to-treat organics. Scaling minerals, temperature swings and seasonal flow from rainfall complicate design. Many sites face rising hauling costs, making onsite treatment attractive.
Where MBR fits
An MBR can nitrify high ammonia and remove biodegradable COD at high MLSS, producing a solids-free effluent suitable for RO or discharge to sewer. Leachate MBRs usually run at conservative flux because of scaling and fouling potential. Ceramic membranes, which tolerate aggressive chemistry and backwashing, are worth evaluating; polymeric flat sheet may suit milder leachates.
Pilot first
Because leachate varies so much, we strongly suggest a pilot. US sites can rent pilot modules.
What operators look for
Operators at a landfill usually want the same things: effluent that consistently meets discharge or reuse limits, solids separation that does not depend on how well sludge settles, and predictable sewer charges. The feed usually carries high ammonia, hard-to-degrade COD and dissolved salts, and the system has to cope with seasonal flow changes with rainfall and aging cells. With membranes, they also look for durable sheets, easy inspection and replacement on a schedule they can plan.
- Consistent, permit-ready effluent
- Manageable cleaning routines
- Planned, predictable membrane replacement
- A compact footprint
How flat-sheet MBR can help
A membrane bioreactor replaces the clarifier with a physical barrier, so effluent quality depends far less on how well the sludge settles. That can make a landfill system more forgiving of seasonal flow changes with rainfall and aging cells. Flat-sheet modules are generally easy to inspect, clean in place and handle without special tools.
Zyramic modules are built around three durability choices. Smaller membrane sheets flex less in service, which can mean less wear, and a damaged sheet takes less area out of service. Strong wide membrane welds are designed to resist delamination. A thick membrane, about 250 microns including support, is meant to stand up to solids and handling. Actual life and flux depend on pretreatment, design and operation, so we size each project individually.
More questions owners ask
Is an MBR hard to run at a landfill?
Most operators find a well-designed MBR manageable with routine checks and periodic cleaning. Good screening and equalization upstream make the biggest difference.
Can we try it before committing?
For US projects, rental and pilot modules may be available so you can test on your own wastewater.
Can your membranes go into our existing tank?
Often, yes. Replacement flat-sheet membranes fit many existing cassettes; send us drawings and we will check fit.
Worked sizing example
Take a landfill generating 26,417 gpd (100 m³/day) of leachate:
| Item | US | Metric | Note |
|---|---|---|---|
| Average flow | 26,417 gpd | 100 m³/day | about 18 gpm (4,167 L/h) |
| Design flux (gross) | 5.9 gfd | 10 LMH | Zyramic design guidance |
| Derate for relaxation and cleaning | ~20% | ~20% | |
| Net flux | ~4.7 gfd | ~8 LMH | |
| Membrane area needed | ~5,606 ft² | ~521 m² | average flow ÷ net flux |
| Swing-8 cartridges | ~42 | ~42 | 135 ft² (12.5 m²) each |
| Peak factor | ~1.5 | ~1.5 | |
| Peak flow | ~39,626 gpd | ~150 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
- Plan for peaks from batch and cleaning discharges
- Size equalization and pH control generously
- Keep fats, lint and solids upstream of the membrane tank
- Use pilot data to choose design flux
Next step
Industrial and special-purpose plants vary widely, so every first conversation starts with fact-finding. A few weeks of flow and lab data, even rough, makes our recommendation far more reliable. Where questions remain, a pilot or a measured first phase is a good way forward.
Sizing considerations
To give a useful recommendation we usually need:
- Flow and seasonal variation
- Ammonia, COD, BOD, TDS and hardness
- Temperature
- Current disposal method
- Downstream RO or discharge
Most relevant product: Ceramic MBR & UF. 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
Can MBR remove PFAS from leachate?
MBR alone generally does not remove PFAS reliably; further treatment is usually needed.
Ceramic or polymeric?
It depends on chemistry and temperature; piloting helps decide.
Will scaling be a problem?
Often, yes; chemistry and cleaning plans address it.
Can you rent for a pilot?
Yes, for US sites.
What about cold winters?
Nitrification slows in cold leachate; heating or longer sludge age may be needed.
Can treated leachate go to sewer?
Often, if limits allow; MBR effluent is far easier for municipal plants to accept than raw leachate.