How to Divert Food Waste from Landfill: Depackager AD/ Compost

Knowing how to divert food waste from landfill is becoming increasingly important for households, businesses, local authorities and waste-management companies.

Food waste buried in a landfill decomposes without oxygen and produces landfill gas containing methane. Although well-operated landfill sites collect and use or flare some of this gas, food waste begins decomposing quickly, and a proportion of its methane can be released before an effective gas-collection system is operating.

The US Environmental Protection Agency estimates that food accounts for approximately 24% of the material placed in US municipal solid-waste landfills but is responsible for about 58% of fugitive landfill methane emissions.^[1]

This makes food-waste prevention and diversion an important climate measure. It can also conserve nutrients, reduce waste-disposal costs and produce renewable energy or useful soil-improvement products.

However, not all food waste should be managed in the same way.

Edible surplus should not be sent directly to a depackaging machine, anaerobic digester or composting facility. The first priority is to prevent waste and keep suitable food within the human food chain.

Depackaging becomes necessary when unavoidable food waste remains inside plastic films, trays, cartons, cans, jars or other packaging and cannot practicably be redistributed.

Key Takeaways

Preventing food waste is preferable to treating it after it has arisen.
Edible surplus should be redistributed to people wherever it remains safe and suitable.
Suitable food may sometimes be used for animal feed, subject to strict legal and hygiene controls.
Packaged food waste must usually be depackaged before anaerobic digestion or composting.
Depackaging equipment should separate food without unnecessarily grinding plastic into the organic output.
Anaerobic digestion converts unavoidable food waste into biogas and digestate.
Composting is suitable for many source-separated biodegradable materials but does not recover renewable gas.
Separate collection is essential because contaminated food waste is much harder to recycle effectively.
Landfill and uncontrolled disposal should be the final options, not the default.

Why Food Waste Should Be Kept Out of Landfill

Food waste contains high concentrations of readily biodegradable organic matter and moisture.

When buried within a landfill, microorganisms break it down under anaerobic conditions. This produces landfill gas, typically containing methane and carbon dioxide, together with smaller concentrations of other gases.

Methane is a powerful, short-lived greenhouse gas. Capturing landfill gas can reduce emissions and produce useful energy, but landfill-gas recovery is not complete.

Food decomposes relatively quickly, often before the final gas-collection infrastructure has been installed over the relevant area of waste. The US EPA therefore places landfilling among the least preferred food-waste management routes.^[1]

Landfilling food also loses resources that could otherwise be recovered, including:

Food suitable for human consumption
Animal-feed value where legally permissible
Renewable energy in the form of biogas
Nitrogen, phosphorus, potassium and organic matter
Compost or digestate for appropriate land use

Diverting food waste is consequently about more than reducing the tonnage entering landfill. It is about keeping food and its nutrients at the highest practicable level of beneficial use.

Follow the Food and Drink Waste Hierarchy

The correct approach begins with the food and drink waste hierarchy.

In England, government guidance ranks the principal options broadly as follows:

Prevent surplus and waste from arising
Redistribute suitable surplus for people
Use suitable material for animal feed where permitted
Recycle unavoidable food waste through anaerobic digestion or composting
Recover energy through less-preferred routes where appropriate
Dispose to sewer or landfill only as a last resort

The guidance states that, where practicable, collected food waste should be sent to anaerobic digestion rather than composting because AD recovers both energy and nutrients.^[2]

The US EPA’s updated Wasted Food Scale applies the same central principle. Preventing waste, donating food and upcycling suitable material rank above biological treatment, while landfill, incineration and disposal through the sewer are among the least preferred pathways.^[1]

Step 1: Prevent Food Waste Before It Arises

The most sustainable tonne of food waste is the tonne that was never produced.

Prevention avoids all the impacts associated with:

Growing or manufacturing the food
Water and fertiliser use
Processing and refrigeration
Packaging
Transport and storage
Waste collection and treatment

Businesses should begin by measuring where and why food is being lost.

Common causes include:

Over-ordering
Inaccurate sales forecasts
Oversized portions
Poor stock rotation
Production errors
Packaging defects
Cold-store failures
Confusion between “use by” and “best before” dates
Cosmetic product specifications

Practical prevention measures include:

Monitoring food waste by type and department
Improving inventory management
Using first-expired, first-out stock rotation
Reducing portion sizes where plate waste is high
Discounting products approaching their best-before date
Improving packaging and production-line controls
Training employees to identify avoidable waste
Setting measurable reduction targets

Prevention generally produces greater environmental and financial benefits than paying to collect and recycle food after it has become waste.

Step 2: Redistribute Edible Surplus

Food that remains safe and suitable for people should be kept within the human food chain wherever practicable.

Potential redistribution partners include:

Food banks
Community kitchens
Homelessness charities
Community fridges
Food-rescue organisations
Surplus-food applications and marketplaces

Food businesses need procedures covering:

Food safety
Temperature control
Allergen information
Traceability
Storage
Collection times
Use-by dates
Liability and contractual responsibilities

Donation should not be treated as an outlet for food that is spoiled, unsafe or no longer suitable for consumption.

When redistribution is planned properly, however, it can reduce waste-disposal costs while delivering direct social value.

Step 3: Consider Animal Feed Where Legally Permitted

Some surplus food and food-production by-products may be suitable for animal feed.

This route is tightly regulated because unsuitable food can transmit animal disease or introduce prohibited ingredients.

Rules vary by jurisdiction and according to:

The source of the food
Whether it contains meat or animal products
Whether it has entered a catering environment
The species to which it will be fed
How it has been stored and processed

Businesses should obtain specialist regulatory advice before classifying food waste or former foodstuffs as animal feed.

Where lawful and safe, animal-feed use can retain more of the material’s original value than biological recycling.

Step 4: Collect Unavoidable Food Waste Separately

Once food is no longer suitable for prevention, redistribution or animal feed, it should be separated from residual waste.

Separate collection is essential because mixed residual waste may contain:

Glass
Metal objects
Batteries
Cleaning chemicals
Nappies and sanitary waste
Non-compostable plastic
Other contaminants unsuitable for biological treatment

Source-separated food waste is easier to process, produces cleaner outputs and reduces the amount of expensive mechanical separation required later.

Separate Food-Waste Collection in England

Under England’s Simpler Recycling rules, workplaces have generally been required to separate food waste, dry recyclable materials and residual waste since 31 March 2025.

Micro-firms with fewer than 10 full-time-equivalent employees have until 31 March 2027 to comply.^[3]

For households in England, the core Simpler Recycling requirements came into force on 31 March 2026. Waste collectors must, by default, collect food and garden waste separately, although approved transitional arrangements apply in some local-authority areas.^[4]

Businesses should confirm:

Which food materials their collector accepts
Whether liners are permitted
Whether packaging must be removed
The minimum collection frequency
Container washing arrangements
Contamination charges
The destination treatment facility

What Does Depackaging Mean?

Depackaging is the mechanical separation of food or another organic product from its packaging.

The process normally produces two main output streams:

An organic-rich fraction for anaerobic digestion or another biological process
A packaging-rich reject containing plastic, metal, paper, card, glass or composite materials

Typical commercial depackaging feedstocks include:

Out-of-date supermarket food
Damaged packaged products
Mislabelled production batches
Rejected dairy products
Bakery waste
Packaged fruit and vegetables
Canned food
Bottled drinks
Ready meals
Food-manufacturing residues

The objective should not simply be to destroy the packaging. A good machine should release the organic contents while retaining the non-organic material in pieces large enough to remove effectively.

Do Households Need Depackaging Machines?

Households do not normally need mechanical depackaging equipment.

Residents should follow the instructions supplied by their local authority or food-waste collector. In most cases, food should be removed from its packaging before being placed in the food-waste container.

Depending on the local collection system, accepted materials may include:

Fruit and vegetable peelings
Cooked and uncooked leftovers
Meat and fish scraps
Bread, rice and pasta
Tea bags and coffee grounds, subject to local rules
Food past its safe or practical use date

Packaging should normally be placed in the appropriate dry-recycling or residual-waste container.

Households should not assume that an industrial treatment plant can safely remove every plastic wrapper, glass jar or metal container placed in the food-waste bin.

When Is Industrial Depackaging Necessary?

Commercial depackaging becomes necessary where significant volumes of food remain inside packaging and manual emptying is impracticable.

Examples include:

A supermarket distribution centre clearing rejected stock
A food manufacturer disposing of an off-specification batch
A drinks producer processing damaged bottles or cartons
A waste contractor collecting packaged food from retailers
An anaerobic digestion facility accepting packaged commercial waste

Without depackaging, the whole product may be sent to landfill, incineration or another low-value outlet.

A suitable depackaging line enables the organic contents to be recovered while directing the packaging into a separate reject stream.

How Food-Waste Depackaging Machines Work

Depackaging machines use different combinations of mechanical action and screening.

Common operating principles include:

Rotating paddles or beaters
Hammer-based impact
Augers and screw mechanisms
Drums and screens
Pressing or extrusion
Vortex or centrifugal separation
Washing and wet separation

The machine opens or disrupts the package and separates the food through a perforated screen or another separation stage.

However, machine designs differ substantially in the amount of packaging fragmentation they cause.

High-speed impact and grinding may produce a pumpable organic slurry, but they can also create small plastic fragments that pass through the screen and contaminate the recovered food.

For that reason, equipment buyers should favour designs that release the food while keeping packaging as intact as reasonably practicable.

Why Depackaging Performance Matters

An inadequate depackaging process can transfer contamination into the anaerobic digestion or composting system.

Plastic fragments may:

Enter pumps and pipework
Wrap around mixers
Accumulate in digestion tanks
Block screens
Increase maintenance requirements
Contaminate compost or digestate
Be spread onto agricultural land

The rejected packaging can also retain excessive food and water, making it:

Heavier to transport
More odorous
Harder to recycle
Less suitable as refuse-derived or solid recovered fuel
More expensive to dispose of

A depackaging machine should therefore be judged by the quality of both outputs, not simply by its stated throughput or organic-recovery percentage.

What to Look for in a Depackaging Machine

Before selecting equipment, buyers should carry out representative trials using their own waste.

Important evaluation criteria include:

Organic recovery: How much of the available food enters the organic fraction?
Pulp purity: How much plastic, glass, foil or metal remains in the recovered material?
Packaging fragmentation: Does the equipment retain packaging in large pieces or pulverise it?
Organic loss: How much food remains attached to the rejected packaging?
Reject moisture: Is unnecessary water being discharged with the packaging?
Water consumption: How much process water is required per tonne?
Energy consumption: What is the electrical demand under normal operating conditions?
Maintenance: What components wear, block or require regular replacement?
Feedstock flexibility: Can the machine process films, rigid containers, cans, cartons and mixed packages?
Downstream compatibility: Does the organic output meet the receiving AD plant’s specification?

Results should be independently sampled where performance guarantees are important.

Avoid Depackaging Systems That Unnecessarily Grind Plastic

One of the most important considerations is whether the machine creates fine plastic contamination.

A screen only retains material larger than its apertures. If the equipment has already broken plastic into smaller particles, those particles may pass through with the food pulp.

Consequently, a machine fitted with a nominally small screen does not necessarily produce plastic-free organic material.

The preferred design principle is:

Open the package, release the food and retain the packaging in the largest practicable pieces.

Low-fragmentation processing can provide:

Cleaner organic pulp
Lower microplastic risk
Cleaner packaging rejects
Improved potential for further sorting
Reduced contamination of digestate
Lower downstream maintenance

Step 5: Send Suitable Food Waste to Anaerobic Digestion

Anaerobic digestion is generally the preferred treatment for separately collected food waste that cannot remain in the food chain.

Inside a sealed digester, microorganisms break down the organic material without oxygen.

The process produces:

Biogas, containing methane and carbon dioxide
Digestate, containing water, plant nutrients and residual organic matter

Biogas can be:

Burned in a combined heat and power unit
Used in a boiler
Upgraded to biomethane
Injected into a gas grid where specifications are met
Compressed for suitable transport or industrial uses

Digestate may be used as a fertiliser or soil-improvement material when it meets regulatory, quality and land-application requirements.

Unlike landfill disposal, AD is a controlled process designed to capture the methane produced and recover its energy value.

UK government guidance describes anaerobic digestion as a process that converts wet organic waste into biogas and nutrient-rich digestate.^[5]

Why Clean Feedstock Is Essential for Anaerobic Digestion

An AD plant is a biological treatment facility, not a universal disposal system.

Its feedstock should be protected from:

Plastic films and fragments
Glass
Metals
Stones and grit
Textiles
Chemicals and disinfectants
Excessive salt
Non-biodegradable packaging

Poor-quality feedstock can reduce effective digester volume, damage machinery and undermine digestate quality.

England’s anaerobic digestate resource framework requires source-segregated biodegradable inputs and places restrictions on food packaging and physical contaminants where digestate is intended to achieve end-of-waste status.^[6]

Good source segregation and careful depackaging are therefore essential parts of AD plant operation.

Step 6: Use Composting Where Appropriate

Composting is an aerobic biological process in which microorganisms break down biodegradable material in the presence of oxygen.

It can be suitable for:

Garden waste
Fruit and vegetable residues
Some food-processing wastes
Woodchip and other structural materials
Suitable certified compostable materials accepted by the facility

Benefits of composting include:

Returning organic matter to soil
Improving soil structure
Supporting water retention
Recycling plant nutrients
Reducing landfill disposal

However, composting does not capture methane as a fuel because the process is designed to remain aerobic.

Food waste also requires careful odour, pest, moisture and hygiene management. For mixed household and commercial food waste, enclosed composting or anaerobic digestion is usually more appropriate than simple open windrow composting.

Home Composting

Home composting can divert suitable kitchen and garden materials without requiring collection and transport.

Commonly accepted materials include:

Fruit and vegetable peelings
Garden cuttings
Leaves
Small quantities of paper and card
Coffee grounds
Crushed eggshells

Meat, fish, dairy products and cooked food may attract pests or create odour in conventional open home-composting bins. Local guidance should be followed.

Home composting should complement, rather than replace, a household food-waste collection because not every type of food can be managed safely or effectively in a basic garden composter.

Food-Waste Macerators and Disposal to Sewer

Sending food waste into the sewer through a kitchen macerator may appear convenient, but it is not normally equivalent to separate collection and recycling.

Food added to the sewer:

Increases the organic load on wastewater treatment
Requires pumping and aeration energy
Can produce methane within sewers
May contribute to blockages when fats, oils and grease are present
May transfer nutrients into sewage sludge rather than a clean food-waste stream

The US EPA places disposal down the drain among the least preferred wasted-food pathways, even where the receiving wastewater plant uses anaerobic digestion.^[1]

Businesses should not install food-waste macerators without confirming legal requirements and obtaining approval from the relevant sewerage undertaker.

Can Food Waste Be Incinerated?

Food waste can enter an energy-from-waste plant as part of residual municipal waste, but it is a poor combustion fuel because it contains a high proportion of water.

Energy must be used to evaporate that water before the food contributes useful heat.

Incineration also destroys the material’s potential nutrient and organic-matter value.

For separately collected food waste, anaerobic digestion is normally a more circular option because it recovers renewable gas and retains nutrients in digestate.

How Businesses Can Save Money by Diverting Food Waste

Food-waste diversion is often presented solely as an environmental obligation, but it can reveal significant operational savings.

The largest saving usually comes from buying less food that will never be sold or consumed.

Further savings may arise from:

Reducing residual-waste collections
Avoiding landfill or incineration gate fees
Using smaller residual-waste containers
Reducing container weight
Improving stock rotation
Preventing overproduction
Reducing drain and grease-management problems
Avoiding contamination charges

However, separate collection can initially increase costs where food-waste services or local treatment capacity are limited.

Businesses should compare the complete costs of:

Containers
Internal handling
Collections
Cleaning
Contamination
Staff time
Residual-waste reductions
Avoided food purchases

Accurate waste measurement is necessary to demonstrate whether the programme is delivering a net financial benefit.

How to Introduce Food-Waste Diversion at a Business

1. Measure the Existing Waste

Carry out a waste audit and record where food is discarded, what types are involved and why the waste arose.

2. Separate Avoidable and Unavoidable Waste

Avoidable food waste may be prevented through better purchasing, preparation or stock management. Unavoidable waste includes items such as bones, shells and peelings.

3. Identify Redistribution Opportunities

Discuss collection requirements with local food banks, charities or food-rescue organisations before surplus becomes waste.

4. Select a Licensed Waste Contractor

Confirm that the contractor can collect food separately and disclose where it will be treated.

5. Install Suitable Containers

Use clearly labelled internal caddies and external containers that are washable, secure and resistant to pests.

6. Train Staff

Explain what belongs in each bin, why separation matters and how contamination affects recycling.

7. Monitor Contamination

Inspect bins regularly and correct recurring errors before collection.

8. Review Collection Frequency

Food waste should not remain uncollected long enough to create avoidable odour, leakage or pest problems.

9. Record Results

Track food purchased, food donated, waste prevented and tonnes sent for biological treatment.

10. Keep Moving Up the Hierarchy

Do not treat a high AD or composting rate as evidence that prevention has succeeded. Recycling large amounts of food is preferable to landfill, but preventing that food from becoming waste is better.

Local Authorities and Food-Waste Diversion

Local authorities play a central role through:

Household food-waste collections
Commercial collection services
Public information campaigns
Procurement of treatment capacity
Contamination monitoring
Support for home composting
Planning for transfer and treatment infrastructure

A successful service requires more than distributing kitchen caddies.

Authorities need suitable collection vehicles, transfer arrangements, treatment contracts, public participation and contingency capacity.

Collected food should be delivered to an authorised facility capable of producing reliable environmental benefits and clean outputs.

Why Treatment Infrastructure Matters

Food-waste bans and mandatory separation rules cannot succeed without sufficient collection and treatment capacity.

Areas introducing diversion policies may need investment in:

Collection vehicles
Transfer stations
Depackaging equipment
Anaerobic digestion plants
Composting facilities
Digestate storage
Biogas upgrading
Grid connections
Markets for compost and digestate

Requiring separation without providing a practical destination can increase transport distances, costs and contamination.

Policy, infrastructure and end markets must therefore develop together.

Food-Waste Bans and Landfill Restrictions

A growing number of jurisdictions have introduced restrictions on landfilling separately collected organics or obligations for large food-waste producers to use alternative routes.

These measures can accelerate investment, but their effectiveness depends on:

Clear definitions
Adequate enforcement
Convenient collection services
Available processing capacity
Affordable gate fees
Reliable outlets for treatment products

A ban imposed before infrastructure exists may result in long-distance transport, temporary exemptions or poor-quality processing.

The objective should be a functioning organic-resource system, not merely a statistical reduction in landfill tonnage.

The Role of Landfill Gas Recovery

Diverting food waste does not make landfill-gas collection unnecessary.

Existing landfill sites will continue producing methane from biodegradable waste deposited in previous years. Modern landfills therefore need:

Gas extraction wells
Collection pipework
Condensate control
Flares
Engines or gas-utilisation equipment
Surface-emission monitoring
Regular balancing and maintenance

Landfill-gas systems reduce emissions from waste already buried. Food-waste diversion prevents additional rapidly degradable material from entering the landfill.

The two measures are complementary, but prevention and diversion should take priority for newly generated food waste.

A Practical Food-Waste Diversion Route

A well-designed system follows this sequence:

Measure food use → prevent avoidable waste → redistribute edible surplus → consider lawful animal-feed uses → separately collect unavoidable waste → depackage where necessary → anaerobically digest or compost → use the recovered energy and nutrients.

Each stage protects more value than simply placing food in a residual-waste container.

Conclusion

Learning how to divert food waste from landfill begins with recognising that treatment is not the first priority.

Food should first be prevented from becoming waste. Suitable surplus should then be redistributed to people or used through another lawful higher-value route.

Only unavoidable food waste should move to biological recycling.

Where food remains inside packaging, commercial depackaging equipment can separate the organic contents from plastic, metal, card and glass. However, the machine must be selected carefully.

A depackager that recovers food while grinding plastic into the organic fraction may create long-term contamination problems for anaerobic digestion plants, composting systems and agricultural soils.

The best systems recover clean organic material, retain packaging in large separable pieces and produce two usable output streams.

Anaerobic digestion can then capture the methane potential of the food as renewable biogas while recycling nutrients through suitable digestate use. Composting provides another valuable route for appropriate source-separated materials.

Landfill should be the last resort because it wastes nutrients, loses much of the food’s remaining value and creates avoidable methane emissions.

Frequently Asked Questions

What is the best way to divert food waste from landfill?

The best approach is to prevent waste first, redistribute edible surplus and separately collect unavoidable food waste for anaerobic digestion or composting.

What is food-waste depackaging?

Depackaging is the mechanical separation of food from plastic, metal, glass, card or composite packaging before biological treatment.

Do households need to remove food packaging?

Usually, yes. Householders should remove packaging and follow their local authority’s food-waste collection instructions.

Can packaged food go directly into an anaerobic digester?

Not normally. Packaging should be removed before digestion unless the facility has suitable authorised depackaging and contaminant-removal equipment.

Why is anaerobic digestion better than landfill?

AD captures the methane produced as biogas under controlled conditions and can recycle nutrients through digestate. Landfill releases a proportion of its methane and loses much of the material’s resource value.

Is composting better than anaerobic digestion?

The best process depends on the material and local circumstances. AD is commonly preferred for food waste because it recovers energy and nutrients. Composting is particularly useful for garden waste and suitable mixtures requiring soil-conditioning products.

Can depackaging machines create microplastics?

Yes. Aggressive shredding, grinding and impact can fragment plastic packaging into particles small enough to enter the recovered organic material.

What happens to packaging after depackaging?

Depending on its cleanliness and composition, it may undergo further sorting, metal recovery, recycling, production of RDF or SRF, energy recovery or disposal.

Are businesses in England required to separate food waste?

Most workplaces have been required to separate food waste since 31 March 2025. Micro-firms with fewer than 10 full-time-equivalent employees have until 31 March 2027.

Can food waste be put down the drain?

This is generally a low-priority route because it increases sewer and wastewater-treatment loads and can generate methane. Local sewerage rules must also be followed.

Sources

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[Published: April 2024. Rewritten June 2026.]

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