Food waste digesters

An aerobic food digester is an on-site machine that uses oxygen, heat, water and carefully selected microorganisms to process food waste quickly. It creates the ideal conditions for these microbes to digest organic material, converting it into a safe grey water output.

Inside the unit, waste is continuously mixed and aerated. Enzymes and microorganisms break down proteins, fats and carbohydrates into simpler compounds, accelerating what would normally be a slow natural process.

Aerobic digestion uses oxygen to process food waste, which speeds up decomposition and reduces odours and harmful emissions.

In contrast, anaerobic digestion works without oxygen, takes longer, and produces biogas such as methane that must be captured and managed.

Compared to anaerobic digesters, aerobic systems are typically faster, simpler to operate on-site, and better suited to businesses that need immediate, daily waste processing.

From restaurants and cafes to supermarkets and food manufacturers, businesses that generate consistent volumes of food waste need a reliable way to manage it every day.

An on-site digester allows you to process food waste as it’s produced, reducing storage, odours and pest risks. It also helps divert waste from landfills, where organic material breaks down and releases methane gas.

ExBio digesters handle a wide range of organic matter, including cooked and uncooked food waste. This includes plate scrapings, leftovers, meat, fish, small bones, bread, dairy products, fruit and vegetable peelings.

ExBio digesters are available in several sizes, with processing capacities ranging from 25 kg to 10,000 kg per day.

Most food waste is processed within 24 hours. Actual processing time depends on the type and volume of material. Please see the diagram below:

Food waste digesters can curb costs across multiple areas of your business:

• Lower waste collection costs: Fewer collections are needed, which reduces transport and landfill fees. The significant drop in waste volume and weight also cuts costs where pricing is based on bin size or weight.
• Reduced labour requirements: Waste is processed as it’s generated, so staff spend less time handling, storing and moving bins. This frees up kitchen and cleaning teams to focus on more valuable tasks.
• Improved hygiene and cleanliness: With less waste sitting idle, odours, pests and general mess are reduced. This can lower ongoing spend on pest control, cleaning services and compliance-related maintenance.
• Better control over waste and purchasing: Built-in visibility of waste volumes helps identify overproduction and spoilage. Equipped with this insight, businesses can adjust purchasing and reduce unnecessary spend.

Choosing the right food waste digester comes down to matching the system to your waste volume, site requirements and day-to-day operations.

It’s important to consider the following factors before buying a waste digester:

• Match the system to your waste stream: Make sure the digester can handle the full range of food waste your business produces, including meat, dairy, fats and mixed organics.
• Measure your real waste output: Calculate how much food waste you produce on your busiest day, not just an average. This ensures the system can handle peak demand without bottlenecks.
• Allow for future growth: Choose a unit with slightly higher capacity than your current needs to accommodate business growth or seasonal increases.
• Assess your site requirements: Confirm you have enough space for installation, along with access to power, water and drainage, where the digester will be located.
• Prioritise continuous loading systems: Aerobic digesters that allow ongoing input throughout the day suit busy kitchens and prevent workflow interruptions.
• Focus on aeration and mixing performance: Strong oxygen flow and consistent mixing keep microorganisms active, which is critical for efficient aerobic processing.
• Ensure effective odour control: Look for features such as carbon filtration and sealed chambers, especially in customer-facing or enclosed environments.
• Look for data and reporting features: Built-in tracking helps monitor waste volumes over time and identify opportunities to reduce waste.

If you’re unsure which waste digester model is best for your business, we’re here to help. For tailored advice on product selections, contact our expert team.

The cost of a food waste digester varies depending on its size, features and processing capacity.

To make this equipment more accessible, Waste Initiatives provides flexible finance options. Enquire now to learn more and get started.