A grease trap holds 2 to 5 percent recoverable brown grease by volume — and the rest is wastewater. The economics live in two places at once. The first is the grease itself, sold as feedstock to renewable diesel producers. The second is the disposal cost on what’s left after recovery: removing the grease drops BOD, COD, and polymer usage in the wastewater fraction, which makes disposal cheaper and in some cases enables free disposal options that wouldn’t accept the unrecovered material. Reiter USA has been designing both halves of the system since 2007.
The Two Revenue Levers: 98–99% Recovery of the Grease Present, Plus Disposal-Cost Reduction
Two things are often confused: what’s in the trap, and what your equipment recovers. A grease trap typically contains 2–5% brown grease by volume — that’s set by the restaurants and operations feeding it, not by your design. What design DOES decide is the recovery rate against what’s there. With well-engineered process and standard components, that’s 98–99% of the grease present. Treat ‘combined yield’ (the grease content times the recovery rate) as the number that drives the math: 2% on the conservative end, 4% on the aggressive end, 3% typical.
And there’s a second revenue lever most operators undercount: every gallon of grease you recover is a gallon of grease that’s no longer in your wastewater fraction. That drops the BOD and COD load, cuts polymer usage, and in many markets opens up cheaper or even free disposal options that wouldn’t accept the un-recovered material. Industry experience: the disposal-side savings often match or exceed the grease-sale revenue.
Trap Brown Grease ROI Calculator — Run Your Own Numbers
Plug in your daily volume, your local disposal rates, and the brown grease price your buyer is quoting (typically $0.20–$0.50 per pound). The calculator returns annual revenue from grease sales, annual disposal savings, total combined benefit, equipment payback period, and 3-year cumulative net. The capital number tiers automatically based on your daily volume.
Conservative parameters (2% combined yield, $0.20/lb grease price, no disposal-rate drop, polymer + BOD/COD savings only): annual ~$237,000, payback ~12.7 months, 3-year cumulative net ~$461,000.
Typical parameters (3% yield, $0.35/lb, $0.10→$0.04 disposal): annual ~$569,000, payback ~5.3 months, 3-year cumulative net ~$1.46M.
Aggressive parameters (4% yield, $0.50/lb, $0.20→$0.02 disposal): annual ~$1.16M, 3-year cumulative net ~$3.22M.
BOD/COD Reduction, Lower Polymer Usage, and Cheaper (Sometimes Free) Disposal
This is the lever that doesn’t show up in equipment vendor brochures. When you recover the grease before disposal, three things shift in your wastewater operations. First, the biological oxygen demand (BOD) and chemical oxygen demand (COD) drop sharply — grease drives BOD/COD load disproportionately to its volume. Second, polymer dosing on the de-greased wastewater drops; less grease means less coagulant needed. Third, with lower BOD/COD load and no recoverable grease left in the stream, the wastewater becomes attractive (or at least acceptable) to disposal partners who wouldn’t touch the original output — sometimes at a fraction of your current cost, sometimes free.
Net effect at typical parameters: roughly $342,000 a year in disposal-side savings on a 3.12-million-gallon-per-year operation, before you book a single dollar of brown grease revenue. The disposal-side lever is what makes recovery economics work even when oil prices are soft.
Integrating TBG Routes Into Your Existing UCO Operation
Many TBG operations start as expansions of an existing UCO collection or grease trap pumping route. The truck infrastructure is similar; the EPA RFS traceability requirements are essentially identical; and route density on the TBG side often comes from customers you’re already servicing. Reiter has designed dozens of these integrations: the brown grease recovery system sits as a parallel processing line at your existing facility, the polishing step feeds into the same shipping infrastructure, and your dispatch software treats TBG stops the same way it treats UCO pickups. The capital and operational lift is real, but it’s incremental, not from scratch.
What to Watch For: The Single-Component Markup
A pattern has emerged in the trap brown grease equipment market. Some vendors charge as much for ONE piece of branded process equipment — an industrial separator, a dewatering unit — as Reiter charges to design an entire operating facility: pipes, valves, storage, receiving, recovery, dewatering, and polishing all included. That’s a price/scope gap, not just a price gap. The components inside the branded equipment are not proprietary. They are off-the-shelf parts available from standard industrial suppliers.
The follow-on problem is the financing trap. A buyer who can’t absorb a substantial markup on a single component is offered ‘helpful’ financing — and that financing is secured by exclusive offtake at supplier-set prices for the life of the loan. The financing only exists because the markup created the affordability gap. The markup only gets repaid because the offtake locks the buyer in. Without the markup, the financing wouldn’t be needed; without the financing, the offtake wouldn’t be possible. It’s a circular trap.
Reiter’s model is different. We design the entire plant on paper using standard components. You buy your own equipment directly from industrial suppliers — at material cost, not at marked-up vendor cost. You own the equipment outright, with no financing lien on it. And when you have brown grease to sell, you sell it to whichever buyer pays best on that load. Reiter sometimes bids on product alongside your other buyers; you compare offers and choose the best price on each load. No exclusivity, no contractual lock-in.
EPA RFS Traceability Built In From Day One
Brown grease sold as feedstock to renewable diesel and biodiesel producers triggers EPA Renewable Fuel Standard (RFS) traceability requirements. Every gallon must be documented from origin (the grease trap) through processing and shipping. Reiter’s designs build this in from day one: dispatch and pickup records tie to source addresses, weights and yields tie to specific recovery batches, and the resulting paperwork survives third-party audits without rework. Designing for traceability later (after you’ve already started collecting) is far more expensive than designing it in from the start — you end up retrofitting paperwork onto operations that weren’t built for it.
2–5%
Grease content in a typical trap (set by source, not by design)
98–99%
Recovery rate against grease present (set by design)
~5 months
Typical equipment payback (10,000 gal/day, 3% yield, $0.35/lb)
15 years
Reiter consulting designs in operation since 2007
For an operation pumping up to 10,000 gallons per day, the recovery and rendering equipment build runs about $250,000 in Reiter-designed material cost. Between 10,000 and 20,000 gallons per day the build scales to about $500,000; above 20,000 gallons per day, about $750,000. These figures cover the whole operating facility (pipes, valves, storage, receiving, recovery, dewatering, polishing) using off-the-shelf parts and Reiter design drawings.
Grease content is the percentage of recoverable brown grease in the trap volume — typically 2–5%, set by the kitchens and operations feeding the trap. Recovery rate is the percentage of that grease your equipment captures — typically 98–99% with good design. The two are independent. ‘Combined yield’ (content multiplied by recovery rate) is what the calculator uses.
Three ways. Removing the grease drops the BOD/COD load on your wastewater, which lowers your tipping fees or surcharges. It also drops your polymer dosing requirement, since you’re treating cleaner water. And in many markets it opens up disposal partners (including some that pay zero) who wouldn’t accept the original grease-laden stream. At typical operations these savings often match or exceed grease-sale revenue.
The disposal-side savings are insulated from oil-price swings. Even if brown grease prices fall to the bottom of the historical range ($0.20/lb), a 10,000 gal/day operation still nets roughly $237,000 a year — payback under 13 months — because the disposal-cost reduction (lower BOD/COD, less polymer, cheaper or free disposal) doesn’t depend on the oil market. Run the Conservative scenario in the calculator above to see what that looks like at your specific volume. The reason recovery operations remain profitable through soft-oil markets is that the disposal lever carries the operation when the revenue lever softens.
Sometimes. When we want to bid, we bid alongside your other buyers — you collect your quotes and choose the best offer on each load. No exclusive offtake, no financing lien, no contractual lock-in. You keep price discovery on every load.
Because the equipment isn’t proprietary — it’s standard industrial parts. Selling marked-up equipment alongside the consulting would force us into a vendor relationship with our clients, which is exactly the model we exist to provide an alternative to. We sell expertise (the engineered design) and let you buy parts from industrial suppliers at their real prices. If you need help sourcing, we make introductions.
Reiter USA has been designing trap brown grease recovery operations since 2007. If you’re evaluating whether the math works at your specific daily volume, disposal rates, and local oil price — run the calculator above. If you want to talk through site specifics, equipment sourcing, or a full design engagement, call (888) 428-5617 or use the contact form.