Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a Belgian Factory Turns Coffee Grounds into Biofuel
Transcript
- Lucas: So you've had your morning coffee. Maybe you're listening to this with a mug in hand right now. Luna: Guilty as charged. Lucas: That ground you're about to toss into the compost or the trash — in Belgium, it's being collected by the ton, dried, and turned into something that can power a bus. Luna: We're talking about biofuel from coffee grounds. I've seen this as a novelty, but there's a factory outside Brussels that does it at scale. Lucas: Right. The company is called EcoFuels — not the flashiest name — and they've been operating since 2019. They started with a pilot that processed about 500 tons a year. By the end of 2025, they were doing 20,000 tons annually. Luna: Twenty thousand tons. That's roughly the weight of four thousand African elephants. Lucas: And it's all spent coffee grounds sourced from within a 150-kilometer radius. Cafes, office break rooms, train station kiosks, even a few Starbucks and a local chain called CoffeeLovers. Luna: How do you even collect that much wet, sticky waste without it rotting? Lucas: That was the first engineering challenge. They give each participating location a sealed 50-liter drum with a one-way valve. When it's full, a logistics partner picks it up within 48 hours. The grounds go straight into a drying drum that runs at 120 degrees Celsius, which drops moisture content from about 60 percent down to under 10 percent. Luna: So you're basically making instant coffee powder, but not for drinking. Lucas: Exactly. Once dried, they run it through a screw press to extract the oil. Coffee grounds contain about 15 to 20 percent oil by dry weight. EcoFuels gets roughly 70 percent of that oil out — about 140 liters per ton of dry grounds. Luna: And that oil becomes biodiesel. Lucas: Correct. They send the crude oil to a refinery partner that esterifies it into B100 biodiesel. The remaining spent solids — the meal after pressing — become biomass pellets that are sold to industrial boilers. Nothing goes to landfill. Luna: That's about as circular as it gets. What's the energy balance like? Is it net positive? Lucas: They published a lifecycle analysis last year. For every unit of energy input — drying, pressing, transport — they get about 3.7 units of energy output in the form of biodiesel and pellets. That's better than many first-generation biofuels, like corn ethanol, which barely break even. Luna: And it doesn't compete with food crops. That's a huge argument in favor. Lucas: Look, speaking of things that don't compete with the usual model — this podcast doesn't run on ads. We don't have a sponsor pushing coffee or anything else. The only reason it stays on the air is that listeners occasionally chip in. If this kind of concrete look at how factories actually work is useful to you, buy me a coffee dot com slash fexingo is where you can help keep it going. Luna: It's a small gesture that makes a real difference. We don't push it often, but it matters. Lucas: Alright, back to the factory. One interesting detail: their biggest single source of grounds is the Belgian rail operator, NMBS. They collect from all the major train stations. Luna: That must be a huge volume, given how many commuters grab a coffee on the platform. Lucas: NMBS alone provides about six thousand tons a year. And they have a 5-year contract that guarantees the supply. That's critical for a facility that runs 24/7. Luna: Consistency of feedstock is always the weak link in these circular supply chains. Lucas: Exactly. EcoFuels has actually turned down collection from smaller towns because the logistics cost per ton would be too high. They have a rule: if a pickup location can't guarantee at least 200 kilograms per week, it's not worth the truck route. Luna: That's a useful reality check. Not every green idea scales uniformly. Lucas: And then there's the seasonality factor. Coffee consumption spikes in winter and drops in summer. The factory runs at about 85 percent capacity in January, but only 65 percent in July. They've learned to stockpile dried grounds during peak months. Luna: So they keep a buffer inventory. How long can dried grounds sit before they degrade? Lucas: They've tested it: dried to below 10 percent moisture and stored in sealed silos, the oil content remains stable for at least 9 months. So they build up stock in the cold months and draw it down in summer. Luna: That's smart operational planning. It also means they've got a hedge against any disruption in collection. Lucas: Right. And they're now expanding. They broke ground on a second facility near Antwerp in March, which should come online early next year. That one is designed for 30,000 tons per year. Luna: So the model is proven enough that they're doubling down. Lucas: The economics work because they have two revenue streams: the biodiesel sells at a premium over fossil diesel — about 15 percent more — because it qualifies as an advanced biofuel under the EU's Renewable Energy Directive. And the pellets sell at roughly the same price as wood pellets. Luna: What about the carbon footprint compared to fossil diesel? Lucas: According to their lifecycle analysis, the biodiesel reduces greenhouse gas emissions by about 82 percent compared to standard diesel. That's well above the 60 percent threshold required for the EU's incentives. The pellet side is roughly carbon-neutral, since the biomass would have decomposed anyway and released that CO2. Luna: One thing I've wondered: does the biodiesel smell like coffee when you burn it? Lucas: That's a common question. The answer is no. The esterification process strips the aromatic compounds. The exhaust from an engine running on coffee biodiesel smells essentially the same as regular diesel exhaust. Slightly less sulfurous, maybe, but no latte aroma. Luna: Disappointing, but I get it. So what's the next innovation they're working on? Lucas: They're piloting a process to extract antioxidants from the grounds before the oil extraction. Coffee grounds contain chlorogenic acid and other polyphenols, which are valuable for cosmetics and food supplements. If they can capture that fraction, it adds another revenue stream. Luna: That would be a triple extraction: antioxidants, oil, and then the biomass. That could significantly improve the unit economics. Lucas: Exactly. The CEO told me that the antioxidant market is worth roughly 10 times what they get for the biodiesel per kilogram. Even a low-yield extraction could add millions in revenue for the same feedstock. Luna: So the factory becomes a biorefinery, not just a biofuel plant. Lucas: That's the vision. And they're not alone. I know of at least three similar facilities being planned in the Netherlands and Germany. The coffee to biofuel concept is moving out of the pilot phase into industrial reality. Luna: And it's a great example of urban mining — extracting value from a waste stream that's generated exactly where people live and work. Lucas: Which brings us back to where we started: your morning coffee doesn't have to be the end of the line. In Belgium, it's just the beginning of a second life.