One of the most frequently asked questions we hear is: What can actually be done with the end product of on-site composting? The answer, like many things in sustainability, depends on the site, and the system in place to manage it.
At the core of on-site composting solutions is the production of soil amendment, a material rich in nitrates and other nutrients. However, this product isn’t quite compost yet. It typically requires time outside of the composter to properly cure, maturing into a stable, usable compost product. This phase is essential, especially if the end goal is to utilize it for landscaping, gardening, or green space maintenance.
But curing requires space, and not every site has that luxury. On top of that, most commercial facilities generate far more soil amendment than they can realistically use.
Ideally, sites can process all organic waste and reuse the resulting compost directly on their property or through community partners, creating a fully integrated closed-loop system. While many organizations aspire to manage their own outputs, the reality is that this isn’t always practical.
Instead, we often see sites utilizing only a small portion of their compost outputs. Producing and applying compost in-house also requires dedicated space, time, and staff capacity, which introduces an entirely new layer of operational management that may not be feasible for every team.
For operations like shopping centers, hospitals, or airports with limited storage or landscaping needs, managing the amendment on-site may not be feasible. These sites must consider how to close the loop through other practical and scalable end-use options.
The Hybrid Model: On-site + Traditional Composting
For many facilities, the most effective solution lies in a hybrid approach: using On-site composters to reduce organic waste volume before sending the remaining soil amendment to a centralized industrial composting facility.
This model brings two major benefits:
- Reduced Hauling Costsand Emissions
On-site composting can reduce the volume of organic waste by up to 80%, significantly cutting down the need for frequent hauling. Unlike raw organic waste, which must be removed regularly to avoid issues like odors and pests, soil amendment produced through on-site composting is more stable and easier to store. This allows facilities to hold material onsite for longer periods without the challenges associated with storing unprocessed organics.
By reducing both volume and the urgency of removal, sites can schedule fewer hauls, lowering operational costs and emissions from transportation. - Improved Diversion of Compostable Packaging
Industrial composting facilities can reject commercial organic loads contaminated with compostable and non-compostable packaging. With the rise of look-alike compostable—items that appear compostable but aren’t—it’s becoming harder for these facilities to ensure clean streams. This leads to entire organics loads being landfilled due to contamination.
On-site composters offer a key advantage in addressing this challenge. They can process compostable packaging materials on-site, breaking them down along with food waste into a soil amendment. Once in this form, the material is significantly less likely to be flagged or rejected by traditional composting facilities.
Because on-site composting systems typically operate under more controlled conditions, facilities are better positioned to verify and manage the types of compostable packaging being used. This makes it far easier to ensure only accepted materials enter the stream, reducing the burden on end processors and increasing overall diversion. In short, breaking it down at the source creates a cleaner, more reliable output, and keeps more compostable out of the landfill.
Why Closing the Loop Matters
By integrating on-site composting systems with traditional composting infrastructure, organizations can improve waste diversion rates, reduce emissions, and support cleaner processing practices.
More importantly, it allows for flexibility. Whether you’re a facility with ample land and landscaping needs or a high-density commercial site with limited space, there’s a pathway to creating a closed-loop organics system that works for you.
In a time when landfills are reaching their limits and climate targets are tightening, every percentage of diverted waste counts. And when we think realistically about where the end product goes and the benefits of each pathway, we take another important step toward a truly sustainable system.
