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What is a Biodigester?
A biodigester is an on-site waste processing system that uses accelerated aerobic decomposition to convert organic waste—including food scraps and compostable PPE—into nutrient-rich fertiliser within 24 hours, dramatically reducing waste volume and disposal costs.
Last reviewed: March 2026
Key Takeaway
A biodigester is an on-site waste processing system that uses accelerated aerobic decomposition to convert organic waste—including food scraps and compostable PPE—into nutrient-rich fertiliser within 24 hours, dramatically reducing waste volume and disposal costs.
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Lisa O'Riordan·Biodigestion systems specialist and sustainability operations expert
How Biodigesters Work
Biodigesters use a combination of heat (70°C+), oxygen, moisture, and specialised enzymes to accelerate the natural decomposition process. Organic waste is loaded into the unit, where rotating drums ensure even exposure to optimal conditions. Within 24 hours, waste is transformed into a stable, odour-free soil amendment.
What Can Be Processed
Modern biodigesters can handle a wide range of organic materials: food waste (including meat, bones, and shells), compostable PPE (EN13432 certified), paper and cardboard, garden waste, and other biodegradable materials. The Harp CX series is specifically designed to process both food waste and compostable PPE, making it ideal for healthcare settings.
Benefits for Businesses
On-site biodigestion offers multiple advantages: 75-80% reduction in waste volume, elimination of waste collection fees, carbon-negative operation, valuable fertiliser output, and real-time data for ESG reporting. Healthcare facilities using biodigesters alongside compostable PPE can achieve near-zero plastic waste targets.
The Output: Biofertiliser
The end product is a nutrient-rich, pathogen-free biofertiliser with high organic carbon content. It can be used directly on gardens and grounds, donated to local community projects, or sold. Unlike traditional composting, biodigester output is ready to use immediately with no further curing required.
Frequently Asked Questions
The Harp CX2 has a footprint of approximately 2m x 1.3m—similar to a large refrigerator. Units can be installed indoors or outdoors with basic power and drainage connections.
No. The enclosed, high-temperature process eliminates odours. The output is also odour-free, unlike traditional composting methods.
Capacity varies by model. The Harp CX2 processes up to 2,000 litres (approximately 315 lbs) of organic waste per week.
Related Products
CE Marked
Harp Biodigester
Get QuoteOn-site biodigestion system for food waste and compostable PPE
24-hour waste-to-fertiliser conversionProcesses food waste and bio-PPE75-80% volume reduction
Made in Ireland
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