SRF Dryer Manufacturer in the United States
See how we dry SRFLooking for SRF dryers manufacturers in the United States? STRONGA builds FlowDrya lines to order at its Hertfordshire works and supplies them to the United States — see the regulatory and economic context below.
We manufacture FlowDrya SRF drying plants to order at STRONGA's Hertfordshire factory and ship them to American producers; in the interest of honesty, we do not yet operate a documented SRF drying reference on US soil. Solid recovered fuel is the tightly specified cousin of RDF: to trade it and to have a cement or lime kiln accept it, the fuel must hold a declared class under EN ISO 21640, and a stable low moisture below 15% is what makes the net-calorific-value, chlorine and particle-size classes repeatable. That same consistency helps the fuel pass EPA's Non-Hazardous Secondary Material test, so a combustion unit knows which Clean Air Act standards apply.
Supplying the United States
We supply the United States from our Hertfordshire works — we have no documented SRF installation in the United States yet.
Regulatory context
Non-hazardous solid waste is regulated under Subtitle D of the federal Resource Conservation and Recovery Act (RCRA): open dumping is banned and municipal solid waste landfills must meet the minimum national criteria of 40 CFR Part 258, but the individual states run the permitting programs and may set stricter rules, so the requirements a drying or waste-processing plant faces vary from state to state.
Source: https://www.ecfr.gov/current/title-40/chapter-I/subchapter-I/part-258 · checked 2026-08
Whether a waste-derived fuel such as RDF or SRF counts as a legitimate fuel or as a discarded 'solid waste' when burned in a cement kiln or waste-to-energy unit is decided by EPA's 2011 Non-Hazardous Secondary Material rule, and that classification sets which Clean Air Act (MACT) emission standards the combustion unit must meet; a consistent, low-moisture, well-specified fuel is central both to qualifying and to stable combustion.
Source: https://www.epa.gov/smm/energy-recovery-combustion-municipal-solid-waste-msw · checked 2026-08
Applicable standards: EN ISO 21640, EN ISO 17225-4, EN ISO 18134, US Composting Council STA (TMECC), 40 CFR Part 503.
Economic context
US landfill tipping fees have climbed year on year — the latest national survey by the Environmental Research & Education Foundation (EREF) put the average at $62.28 per ton, roughly 10% up on the prior year, and large or private landfills charge appreciably more — so avoiding disposal is a growing cost saving.
Source: https://www.recyclingmonster.com/article/eref-us-landfill-tipping-fees-soared-10-in-2024/4251 · checked 2026-08
US industrial customers paid an average of roughly 8.29 cents per kWh for electricity in 2025 (EIA Electric Power Monthly, Table 5.6.A) — cheaper than in Europe but still well above the cost of recovered process heat, so a dryer that runs on waste heat and draws little grid power protects the operating margin.
Source: https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a · checked 2026-08
US industrial natural gas is inexpensive by world standards — recent EIA data put it at $4.07 per thousand cubic feet — which favours drying systems designed around gas-fired or biomass-fired heat, or recovered kiln and boiler exhaust, rather than electric heating.
Source: https://www.eia.gov/dnav/ng/hist/n3035us3a.htm · checked 2026-08
Worked illustration (assumptions stated):
SRF economics reward specification discipline. A producer able to guarantee an EN ISO 21640 class commands a better offtake price than one shipping damp, variable material, and a fuel above 20 MJ/kg widens the pool of kilns willing to burn it. Set against a national landfill tipping fee of $62.28 per ton, even a modest drying cost is quickly justified. Because industrial electricity runs near 8.29 cents per kWh while natural gas is only $4.07 per thousand cubic feet, a dryer designed around gas-fired or recovered kiln heat – not electric elements – is the economical route to reach and hold the target class. Assumptions: these are national reference prices, not a site quotation.
Figures are indicative and were last reviewed August 2026; energy and disposal prices move — contact us for a current assessment.
SRF Dryer Manufacturer in the United States — FAQ
Do you supply SRF dryers in America?
Yes. FlowDrya SRF dryers are engineered and assembled in Hertfordshire, factory-tested before shipping, and commissioned on the customer's site with operator training and a full hot test before handover.
How does drying help SRF meet EN ISO 21640?
Moisture drives net calorific value, and an unstable moisture content pushes a batch between classes. By conditioning the fuel to a repeatable low moisture, FlowDrya helps a producer declare and hold a class a kiln operator will accept.
Do you have a US SRF installation?
Not for SRF. Rather than imply a reference we lack, we point customers to our documented bark, digestate and woodchip projects in Britain, which prove the identical drying technology on comparable heterogeneous feedstocks.
How does SRF differ from RDF for a kiln operator?
SRF is the refined, quality-assured grade: sorted, shredded and dried to a declared specification, whereas RDF is a cruder, more variable output. Kiln operators pay more for the predictability a classified fuel brings.
Can one plant switch between fuel grades?
Yes. By adjusting residence time and air temperature, a single FlowDrya can condition both coarser refuse fuel and tightly specified solid recovered fuel, giving a producer flexibility as offtake contracts change.
What US rules govern burning SRF in a kiln?
EPA's Non-Hazardous Secondary Material rule determines whether the fuel is a legitimate product or a solid waste, and that decides which Clean Air Act emission standards the kiln or boiler must meet.