Reduce landfill methane
Food and other organics generate methane when they decompose without oxygen in landfill. Diverting suitable material to well-managed aerobic composting avoids much of that methane-forming pathway.
Organic waste is a resource
Why compost?
Composting keeps food scraps and other suitable organics out of landfill, returns carbon and nutrients to soil, and turns a disposal problem into a useful soil amendment—onsite at homes, farms and smaller commercial or institutional operations.
The environmental advantage depends on good management: oxygen, moisture, carbon balance, temperature and curing all matter.
120–2,000 L systemsOnsite aerobic composting—not industrial waste processing
Benefits of composting
Keep the value. Avoid the landfill pathway.
Organic material contains carbon, nutrients and water. Composting manages its biological breakdown so that a stable soil amendment can be recovered and used locally.
Build healthier soil
Mature compost adds organic matter, supports soil organisms and can improve soil structure, water infiltration and moisture retention.
Cycle nutrients locally
Instead of burying nutrients, composting returns suitable organic material to gardens, farms, landscapes, sports fields and restoration projects.
Use landfill space wisely
Keeping organics out of disposal sites reduces the material placed in landfill and can help extend landfill service life.
Support resilient landscapes
Compost can help soils absorb rainfall, resist erosion and retain water during dry periods. Results vary with soil, compost quality and application.
Create a useful product
Finished compost can displace some purchased soil amendments and support gardens, grounds, landscaping and agricultural production.
What happens during decomposition?
Two biological pathways. Very different outcomes.
Microorganisms break down organic matter in both pathways. The availability of oxygen determines which communities dominate, which intermediate compounds form and which gases are released.
With oxygen
Aerobic composting
Aerobic bacteria and fungi use oxygen while consuming readily degradable carbon. Their activity releases heat and progressively converts a mixed organic feedstock into more stable material.
Organic matter+Oxygen→CO₂ + water + heat+Stable organic matter
- Active breakdown: microbes consume accessible sugars, proteins and fats.
- Heating: biological activity releases heat; a sufficiently large and balanced mass may enter the thermophilic range.
- Stabilization: the fastest activity slows as easily degradable material is consumed.
- Curing: the material matures into a more stable amendment before use.
Important: aerobic composting still releases biogenic CO₂ and can form some methane or nitrous oxide if wet, compacted or poorly managed. “Aerobic” describes the intended process—not a guaranteed condition throughout every part of the material.
Without oxygen
Anaerobic breakdown in landfill
Once buried and oxygen is depleted, microbial communities break organics down through a sequence of reactions. In landfill, the resulting gas may be partly captured, but collection is not complete and generation can continue for years.
- Hydrolysis: complex carbohydrates, proteins and fats are split into smaller soluble molecules.
- Acidogenesis: acid-forming microbes produce volatile fatty acids, alcohols, hydrogen, CO₂, ammonia and other intermediates.
- Acetogenesis: intermediates are converted mainly to acetate, hydrogen and CO₂.
- Methanogenesis: archaea convert acetate or hydrogen plus CO₂ into methane-rich landfill gas.
Anaerobic digestion is different: a purpose-built sealed digester intentionally captures biogas for energy and can be a beneficial diversion route. Uncontrolled anaerobic decay in landfill does not provide the same process control or capture efficiency.
Anaerobic gases and by-products
What forms—and why it matters.
Methane (CH₄)
Produced mainly by methanogenic archaea using acetate or hydrogen and CO₂. Methane traps much more heat per unit mass than CO₂ over a 100-year period, making fugitive landfill methane a major climate concern.
Carbon dioxide (CO₂)
Produced during fermentation and conversion reactions and present with methane in landfill gas. Biogenic CO₂ is part of the shorter carbon cycle, but the landfill pathway also delays nutrient recovery and can release fossil-derived trace compounds.
Hydrogen sulfide (H₂S)
Produced when sulfur-containing material is reduced under oxygen-poor conditions. It has a strong rotten-egg odor, causes corrosion and is hazardous at elevated concentrations.
Ammonia (NH₃)
Released as microbes break down nitrogen-rich proteins and amino acids. It contributes pungent odor and represents a loss of nitrogen that might otherwise be retained in a managed compost mix.
Trace organic gases
Volatile organic compounds and other non-methane constituents can form or volatilize. Their type and concentration depend on the waste received and landfill conditions; some contribute odor, air pollution or health concerns.
Leachate
Water moving through waste can carry dissolved organic acids, ammonium, salts, metals and other contaminants. Engineered landfills collect and treat leachate, but it remains a long-term management responsibility.
Economic benefits
Waste diversion can create operational value.
Composting economics are site-specific, but homes, farms and smaller organizations may find value on both sides of the ledger: reducing disposal needs and producing an amendment that can be used onsite.
Estimate size and potential valuePotentially lower disposal costs
Onsite diversion may reduce the weight or frequency of organic waste collection where hauling and tipping fees apply.
Useful finished compost
Compost used in gardens, landscaping or grounds may offset a portion of purchased soil amendments.
Local material management
Processing close to where material is generated can reduce dependence on distant disposal or processing infrastructure.
Visible sustainability action
A well-run program can support waste-diversion goals, staff or student engagement and sustainability reporting.
Savings are not guaranteed. Evaluate labour, carbon amendments, space, equipment, curing, contamination control, local collection contracts and regulations when assessing a program.
Composting versus landfill
Landfill stores a problem. Composting manages a resource.
Source reduction and edible-food rescue should come first. For unavoidable suitable organics, managed composting generally provides a more productive pathway than burial.
ConsiderationLandfillWell-managed composting
Oxygen conditionsPredominantly anaerobic after burialActively managed to remain aerobic
Climate pathwayGenerates methane; some may be captured or oxidizedPrimarily biogenic CO₂, water and heat; poor management can still create methane or N₂O
Material outcomeNutrients and organic matter are largely unavailable for beneficial useProduces a soil amendment after active processing and curing
Water managementCreates leachate that requires long-term collection and treatmentMoisture is managed as part of the process; excess water and runoff still require control
Time horizonGas and leachate management can continue long after disposalActive management occurs over a defined processing and curing period
Local valueConsumes disposal capacityCan support soil, landscaping, agriculture and community programs
Choosing an approach
Why use a well-managed hot rotary composter?
No method is universally best. Site volume, feedstock, labour, climate, space, regulations and the intended use of finished material should guide the choice.
| Approach | Main advantage | Primary limitation | Best fit |
|---|---|---|---|
| Static backyard pile or bin | Low equipment cost and simple setup | Mixing, aeration, pests and temperature can be difficult to manage | Lower-volume garden material with attentive operation |
| Open pile or farm windrow | Can process larger volumes with relatively simple infrastructure | Needs land, turning equipment, runoff planning and odor control | Farms and sites with adequate space, equipment and operating oversight |
| Vermicomposting | Creates a valuable worm-derived amendment | Worms need moderate conditions and suitable feedstocks; not a hot process | Smaller, controlled programs and education |
| Anaerobic digestion | Captures methane-rich biogas and produces digestate | More complex infrastructure; digestate still requires responsible management | Centralized or farm-scale projects with suitable wet feedstocks and energy-recovery infrastructure |
| Insulated rotary hot composting | Frequent mixing and heat retention can accelerate active decomposition while supporting contained aeration and monitoring in a compact footprint | Requires correct recipe, loading, rotation, moisture control, monitoring and curing | Homes, farms and small-to-midsize onsite programs at breweries, restaurants, resorts, schools, institutions and community sites |
Scale matters: Durvela’s standard range is 120–2,000 L. It is intended for onsite household, agricultural and small-to-midsize commercial or institutional composting—not as a substitute for an industrial composting facility, municipal windrow operation or large anaerobic digester.
More uniform mixing
Rotation and internal mixing features redistribute wet and dry material, moisture, heat and air more consistently than an undisturbed pile.
Better oxygen management
Purpose-built vents, regular rotation and optional active aeration help operators maintain aerobic conditions and limit odor-forming anaerobic pockets.
Heat retention
An insulated drum reduces heat loss. The microorganisms—not the equipment—generate heat, so feedstock balance, mass and operating conditions remain essential.
Contained operation
An enclosed, latched stainless steel drum helps contain material and deter rodents while presenting a cleaner installation for homes, guests, staff and campuses.
Visible process feedback
Monitoring ports make it easier to check temperature and adjust the operating routine. They do not replace observation, recordkeeping or material testing.
Durable construction
304 stainless steel provides a cleanable, corrosion-resistant structure for frequent outdoor use, with replacement parts and technical support available.
Potential drawbacks
Composting is better managed—not automatic.
A good system improves control, but every composting method still requires an appropriate feedstock, an operating routine and a plan for the finished material.
Odor and anaerobic pockets
Too much wet, nitrogen-rich material or too little air can create volatile fatty acids, ammonia and sulfur compounds.
How Durvela helps
Mechanical mixing, engineered vents, insulation and optional active aeration support oxygen-rich conditions. Operators must still balance feedstocks and moisture.
Rodents, flies and wildlife
Exposed food scraps can attract pests, particularly when fresh material remains accessible.
How Durvela helps
A contained stainless steel drum and latched access points reduce exposure. Good housekeeping and correct loading remain important.
Labour and consistency
Open piles may require lifting, turning and repeated correction; programs can fail when routines are unclear.
How Durvela helps
Integrated rotary mixing makes regular agitation more manageable and supports a repeatable loading, rotating, monitoring and unloading workflow.
Cold-weather slowdown
Biological activity slows when heat is lost or the microbial population lacks adequate food, moisture or oxygen.
How Durvela helps
75 mm polyurethane insulation helps retain biologically generated heat. It cannot create heat when the compost mix is inactive.
Contamination and unsafe inputs
Plastic, treated materials, chemicals and unsuitable food-service items can compromise finished compost.
How Durvela helps
The controlled loading point supports clear material rules, but source separation, staff training and inspection are still the operator’s responsibility.
Space, cost and curing
Equipment requires capital, a stable foundation, safe access and room to unload and cure material.
How Durvela helps
Four standard sizes support right-sizing, while a contained footprint can be easier to plan than multiple small bins. Curing space is still required.
A practical operating cycle
Five steps to better aerobic composting.
Frequently asked questions
Composting, landfill and process control.
These answers describe the general science. Site conditions, approved feedstocks and regulatory requirements vary.
Is composting always better than landfill?
For unavoidable suitable organic material, well-managed composting generally avoids the methane-forming landfill pathway and produces a useful soil amendment. The actual result depends on collection distance, energy use, process emissions, contamination, compost quality and whether the compost is beneficially used. Preventing wasted food and rescuing edible food should come before composting.
Does aerobic composting produce greenhouse gases?
Yes. Aerobic decomposition produces mainly biogenic carbon dioxide and water, and composting can also emit smaller amounts of methane and nitrous oxide—especially where oxygen, moisture or nitrogen are poorly managed. Good aeration, structure and moisture control help limit these emissions.
Why is methane from landfill a concern?
Methane is a powerful greenhouse gas. It forms when methanogenic microorganisms break down organic material without oxygen. Landfill gas systems can capture and flare or use some methane, but collection is incomplete and often begins after readily degradable food waste has already started producing gas.
Is anaerobic digestion the same as landfill decomposition?
No. Both occur without oxygen, but an engineered anaerobic digester controls the process in a sealed vessel so methane-rich biogas can be captured and used. Landfill decomposition is less controlled, gas capture is incomplete and nutrients are harder to recover.
Will a rotary composter eliminate odor?
No composter can guarantee zero odor. A contained rotary system makes mixing and aeration easier, but odors can still develop if the material is too wet, too dense, overloaded or short of carbon. Prompt correction of the recipe and operating conditions is essential.
Does an insulated composter heat the material?
No. Microbial activity generates the heat. Insulation slows heat loss and can help maintain active conditions, but the feedstock mix, moisture, oxygen, mass and ambient weather determine whether temperatures rise.
Scientific and government sources
This educational page is informed by the following public resources. Environmental outcomes vary by feedstock, climate, transport, equipment, process management and end use.
- Environment and Climate Change Canada — Waste and greenhouse gases
- Environment and Climate Change Canada — Municipal solid waste organics processing
- U.S. EPA — Composting
- U.S. EPA — Quantifying methane emissions from landfilled food waste
- U.S. EPA — Environmental value of applying compost
- USDA NRCS — National Engineering Handbook: Composting
- The Composting Handbook, edited by Robert Rynk et al., Academic Press, 2022. ISBN 978-0-323-85602-7
Turn organics into an asset
Choose a system sized for the material you actually generate.
Compare 120–2,000 L capacities, estimate your weekly mix and plan a controlled onsite composting workflow for your home, farm or organization.