Odor complaints often start at the leachate pond. Stop them at the source.
An open leachate pond releases odorous compounds around the clock, and the wind delivers them to the nearest homes. Covex® floating cover seals 98% of the surface and reduces odor emissions by over 90% at the source. No structures, no anchoring, no draining the pond.
The pond is small. Its odor footprint isn't.
Leachate concentrates everything a landfill produces: ammonia, amines, reduced sulfur compounds and volatile organics. On an open pond, every square meter of surface is an emitter, and wind sweeping across the liquid strips those compounds off and carries them downwind. That is why complaints peak on warm, windy afternoons, and why they come from people who can't even see the landfill.
Complaints become inspections
A pattern of odor complaints is what usually puts a site on the regulator's agenda. Each episode costs management time, legal attention and credibility you need for the next permit.
Expansions get harder
New cells, permit renewals and capacity increases are discussed in front of the community. An odor history is the first thing raised, and the hardest to answer with promises.
Masking is not controlling
Neutralizer misting and fragrances treat the air after the odor has left the pond. They need constant dosing and energy, and the odor is back the moment the system stops.
Odor, algae and birds share one cause: the open leachate surface.
Covex® is a modular cover of hexagonal HDPE units that float and interlock on their own. It covers 98% of the surface in a stable, permanent way thanks to its aerodynamic design, its factory-sealed water ballast and its minimal freeboard.
- 98% less emitting surfaceOdorous compounds are left with only the small gaps between units to escape through.
- No wind strippingAir moves over the cover, not across the liquid, so the wind stops pulling compounds out of the pond.
- No light, no algaeBlocking sunlight cuts algae growth by over 90%, and with it the odors of blooms decaying in the pond.
Independent olfactometry: the cover works hardest when the wind blows.
Our floating cover technology was tested by an independent environmental laboratory using dynamic olfactometry on side-by-side ponds of high-load organic effluent, one covered and one left open, both under still air and under forced airflow across the surface.
The reduction in odorous gases was greatest under airflow: the exact condition that carries odor from a pond to a community.
Results depend on pond geometry, coverage achieved and leachate characteristics. Every Covex® project is sized on your site data.
Is your leachate pond the source? Send us its area and we'll tell you what a cover would change on your site.
Assess my pondDesigned for the conditions of a landfill, from the wind to the birds.
The same material as your liner
Covex® is made of HDPE, the polymer used in landfill liners and geomembranes, with antioxidant and UV additives. Operating range from -40°C to 85°C.
Ballast sealed at the factory
Each unit carries water ballast sealed during manufacturing. Nothing is filled on site, and no unit ever takes on leachate.
It follows the level
Recirculation, pumping and storms change the pond level every week. The cover rises and falls with it and re-levels by itself, with no cables, anchors or tensioning.
Rain goes through
Rainfall drains between units into the pond. No standing water on top, no rainwater pumps, no sheet sagging under its weight.
Rated for exposed sites
Landfills sit on open, windy terrain. Covex® XT 50 is designed for winds up to 100 km/h, thanks to its aerodynamic profile and low freeboard.
No open water for birds
Landfills already attract birds. An open leachate pond adds a place to drink and bathe, and a way for contamination to leave the site. With 98% of the surface covered, there is no open water left, which also helps near airports.
Birds, wind or level swings on your leachate pond? Tell us about the site and we'll size a cover for it.
Talk to a specialistHow Covex® compares with other odor controls on leachate ponds.
| Covex® | Neutralizer misting | Floating membrane | Structural cover | |
|---|---|---|---|---|
| Acts at the source | Yes | No, treats the air | Yes | Yes |
| Energy or chemicals in operation | None | Continuous | Rainwater pumping | Ventilation, usually |
| Pond drained to install | No | No | Often | Usually |
| Level changes | Self-levelling | Not applicable | Needs ballast and slack design | Fixed structure |
| Rainwater | Passes through | Not applicable | Must be pumped off | Gutters and drainage |
| If something fails | One unit, replaced by hand | Odor returns at once | A tear affects the sheet | Structural repair |
| Gas capture | No | No | Possible | Possible |
Typical characteristics of each technology; specific products vary. If your goal is gas capture, a sealed membrane is the right tool. If your goal is to stop odor reaching your neighbors with no operating cost, Covex® is.
Comparing options for your site? We'll put together a side-by-side for your pond.
Get my comparisonInstalled while the pond keeps working.
Site data
Pond area and geometry, inlets, pumps and equipment, operating levels and wind exposure.
Sizing and quote
50 units per square meter, shipped in bulk bags straight to your site.
Release on the pond
Units are released from the bank and spread and interlock on their own. No draining, welding or anchoring.
Operation
Periodic visual inspection only. At the end of its life, the cover is fully recyclable.
Questions landfill operators ask us.
Is Covex® gas-tight? Can it capture biogas?
No. Covex® reduces odor by limiting the exposed surface and keeping the wind off the liquid; it is not a gas-tight membrane. If you need to collect gas, a sealed membrane system is the right choice. If you need odor control with no operating cost and no maintenance burden, Covex® is.
Does it resist leachate?
HDPE has broad chemical resistance and is the standard material for landfill liners. For leachates with unusual chemistry, we review your analysis before quoting.
Can it be used on aerated lagoons?
Covex® is best suited to storage, equalization and holding ponds. Where there are surface aerators or strong turbulence, we evaluate the layout case by case.
What about pumps, inlets and level sensors?
Units float freely around fixed equipment. During sizing we plan the access points and equipment zones your operators need to keep clear.
What happens in strong wind?
Covex® XT 50 is designed for winds up to 100 km/h. In strong gusts some units may stack temporarily, but floating units don't blow away and the cover re-levels by itself. Units left on the slope when the level is very low are the most exposed, so we review your operating levels as part of the study.
How do I verify the result?
We recommend measuring odor before and after installation with your environmental consultant, and we help define the protocol so the comparison holds up.
Let's do the numbers.
Tell us the pond area and what your neighbors are telling you. A Covex® specialist will come back with a sizing and a quote for your site.
Read before you specify.
Material written for landfill and environmental teams, not for procurement brochures.
Landfill leachate pond odor: why it reaches the community and how to control it at the source
Why open leachate ponds drive odor complaints, why they peak on windy afternoons, and how the common odor controls compare.
Cover sizing and quote for your leachate pond
Send us the pond area, the equipment on the surface and your operating levels, and we return a sizing and a quote for your site.