energy · environment · manufacturing · circular-economy · materials · family: making one is easy. making a million is the problem
garbage in,corrosion out
Corrosion-resistant gasification of municipal solid waste for fuel production
Problem statement
Converting municipal solid waste (MSW) into liquid fuels through gasification is chemically feasible but fails at commercial scale because the heterogeneous waste stream produces corrosive byproducts — at Fulcrum's plant, unexpectedly formed nitric acid — that eat through equipment and corrode downstream piping, causing months of delay. Fulcrum BioEnergy raised over $1 billion and spent more than a decade attempting this before its 2024 bankruptcy, and The Chemical Engineer's post-mortem reports that similar problems — significant NOx emissions and nitric acid corrosion of downstream piping — had been observed eight years earlier at Air Products' Tees Valley project. Feedstock variability in real MSW is likely to make the process harder to control than the homogeneous inputs used in lab demonstrations, though the sources named here do not examine this directly.
Why this matters
Sustainable aviation fuel (SAF) production reached 1 million tonnes in 2024 — only 0.3% of global jet fuel production (IATA) — far below what airline decarbonization commitments require. Municipal solid waste is one of the most abundant potential feedstocks — the world generated 2.56 billion tonnes in 2022 (World Bank, What a Waste 3.0), with about 30 percent of global waste either openly dumped or left uncollected. If MSW gasification could work reliably, it would simultaneously address waste disposal and clean fuel production. Airlines including United ($30 million in 2015), Cathay Pacific, and Japan Airlines (investment, September 2018) invested directly in Fulcrum, signaling real demand.
What’s been tried and why it hasn’t worked
Fulcrum BioEnergy built a gasification plant costing more than $200 million near Reno, Nevada that began operations in 2022. Its startup was "plagued by the unexpected creation of nitric acid, which ate through the facility's equipment, causing millions of dollars of damage and months of delay" (Bloomberg, from an internal company report); a February 2023 shipment of synthetic crude contained only 350 gallons. The plant later failed again through a second mechanism — a thick, cement-like sludge built up in the gasification system, in places more than 10 feet thick, forcing the plant to shut down again — and stopped operating in May 2024, with Fulcrum filing for Chapter 11 that September. Air Products' Tees Valley waste-gasification project in the UK was abandoned in April 2016 at a writedown of US$900m–1bn after the company concluded that "additional design and operational challenges would require significant time and cost to rectify"; The Chemical Engineer's 2024 post-mortem of Fulcrum reports Tees Valley likewise experienced significant NOx emissions and nitric acid corrosion of downstream piping. None of the sources named here explains the chemistry beyond the nitric acid and NOx themselves. The write-up's working assumption is that real municipal waste carries nitrogen and other acid-forming constituents in varying concentrations, that lab-scale and pilot-scale tests on pre-sorted, relatively homogeneous feedstocks do not capture this variability, and that existing gas-cleaning technologies (scrubbers, filters) are designed for more predictable industrial gas streams. The Chemical Engineer's post-mortem draws a narrower lesson: the corrosion and emissions at the Nevada plant show the importance of extensive testing and pilot phases before scaling up.
What would unlock progress
Progress requires either (1) corrosion-resistant materials and coatings that can withstand the acidic syngas environment at gasification temperatures, or (2) robust real-time sensing and adaptive gas-cleaning systems that can handle the compositional variability of MSW-derived syngas, or (3) preprocessing approaches that can cost-effectively remove nitrogen-bearing and other acid-forming materials from the waste stream before gasification. Adjacent fields with relevant solutions include geothermal energy (corrosion-resistant well materials for hot acidic fluids), chemical processing (adaptive scrubber systems), and waste sorting (AI-driven robotic sorting for contaminant removal).
Entry points for student teams
A student team could investigate one of several scoped approaches: (1) characterize the range of corrosive species produced by gasifying different MSW compositions using small-scale reactor experiments, mapping feedstock variability to corrosion risk; (2) test candidate corrosion-resistant coatings or linings under simulated MSW syngas conditions; (3) design a low-cost inline sensor system for detecting corrosive species in syngas in real time, enabling adaptive gas cleaning. Relevant disciplines include materials science, chemical engineering, environmental engineering, and sensor design.
Genes
Structural cousins: stuck the same way, in other fields
Sources
"Why the Lessons of the Fulcrum Fiasco must not be Wasted," The Chemical Engineer, 2024, "Fulcrum BioEnergy files for Chapter 11 bankruptcy protection," Waste Dive, 10 Sept 2024, "Waste-to-Fuel Company That Raised $1 Billion Verges on Collapse," Bloomberg via Energy Connects, May 2024, "Air Products quits Tees Valley gasification," The Chemical Engineer, 5 Apr 2016, Accessed 2026-08-20. go to source 1 ↗ go to source 2 ↗ go to source 3 ↗ go to source 4 ↗
Working notes
Notes made while writing and checking this brief, shown as written. They use working shorthand.
- Fulcrum BioEnergy ($1B+ raised) and Air Products Tees Valley (US$900m–1bn writedown) both failed; The Chemical Engineer's 2024 post-mortem says Tees Valley saw similar nitric acid corrosion, suggesting this is a fundamental barrier, not an execution failure.
- Red Rock Biofuels faced foreclosure on its $300M waste-to-fuel plant in 2023; the plant was never finished, so corrosion is not a supported cause (see the 2026-08-20 note below).
- Related to existing brief `energy-lfp-battery-recycling-economics` in that both involve scaling chemical processes from lab to commercial operation. The failure:lab-to-field-gap pattern is consistent.
- MSW composition varies significantly by region and season, making any solution need to be robust to input variability — connects to the failure:ignored-context pattern seen across the collection.
Reconciliation 2026-08-20: The body previously attributed the quote "plagued by the unexpected creation of nitric acid, which ate through the facility's equipment" to Air Products' Tees Valley startup. Verified against the sources: that quote describes Fulcrum's Sierra plant near Reno (Bloomberg, "Waste-to-Fuel Company That Raised $1 Billion Verges on Collapse," May 2024, via Energy Connects; the same sentence appears in The Chemical Engineer's 2024 Fulcrum post-mortem). It is now attributed correctly. Tees Valley's cancellation (April 2016, US$900m–1bn writedown — larger than the "$500M+" in the note above) was publicly attributed by Air Products to unspecified "design and operational challenges" (The Chemical Engineer news, 5 Apr 2016, which does not mention nitric acid); the claim that Tees Valley also saw NOx emissions and nitric acid corrosion of downstream piping rests on The Chemical Engineer's 2024 post-mortem and is now framed as such. Fulcrum's second failure was a distinct mechanism (cement-like sludge buildup), not a repeat of the nitric acid corrosion, per Bloomberg. Also corrected with verified figures: SAF = 0.3% of global jet fuel production in 2024 (IATA press release, 10 Dec 2024, https://www.iata.org/en/pressroom/2024-releases/2024-12-10-03/), replacing an unsourced "<0.1%" and "10–20x by 2040" projection; global MSW = 2.56 billion tonnes in 2022 (World Bank What a Waste 3.0, https://www.worldbank.org/what-a-waste), replacing "~2 billion tonnes"; airline investors verified — United $30M in 2015 (Bloomberg/Energy Connects), Cathay Pacific (GreenAir News, https://www.greenairnews.com/?p=645), Japan Airlines equity investment Sept 2018 (JAL press release, https://press.jal.co.jp/en/release/201809/004885.html). On the Red Rock Biofuels bullet above: the ~$300M foreclosure in early 2023 is verified (Mail Tribune / Lake County Examiner), but the plant never operated, so its failure was financial/construction — "likely related issues" (i.e., corrosion) is not supported and should not be carried forward.
Reconciliation 2026-09-30: Fact repair after reading the whole write-up against every source it names, by a first reader and then a second reader who went over the repairs on the same day. Read in full, directly from the publisher: The Chemical Engineer's Fulcrum post-mortem (Alex Howard, 5 July 2024, https://www.thechemicalengineer.com/features/why-the-lessons-of-the-fulcrum-fiasco-must-not-be-wasted/); the Waste Dive bankruptcy report (10 Sept 2024); the Bloomberg article via Energy Connects (Ben Elgin, 28 May 2024); The Chemical Engineer's Tees Valley news item (5 April 2016); the IATA press release of 10 Dec 2024; the GreenAir News page (https://www.greenairnews.com/?p=645, which names Cathay Pacific, BP and United as Fulcrum investors); the World Bank What a Waste 3.0 landing page (https://www.worldbank.org/en/publication/what-a-waste, where the linked address resolves) and, by the second reader, the full report and its executive summary from the Open Knowledge Repository (https://openknowledge.worldbank.org/entities/publication/1a464650-9d7a-58bb-b0ea-33ac4cd1f73c); and the Lake County Examiner report on the Red Rock Biofuels foreclosure (24 Dec 2022, https://www.lakecountyexam.com/townnews/finance/red-rock-biofuels-in-foreclosure-owes-350m/article_b412f9be-83ea-11ed-8c67-afabd1a19c78.html). The JAL press release of 21 Sept 2018 returned 403 to a script and was read in full from the Internet Archive copy (web.archive.org/web/2id_/press.jal.co.jp/en/release/201809/004885.html). (1) The problem statement said the corrosive byproducts were "primarily nitric acid and chlorine compounds" that "destroy downstream piping and catalysts within months." No source mentions chlorine, catalysts, or a timescale of months to failure; Bloomberg says nitric acid "ate through the facility's equipment, causing millions of dollars of damage and months of delay," and The Chemical Engineer says "nitric acid corrosion of downstream piping." The sentence now says that. (2) The statement that feedstock variability makes the process "fundamentally harder to control" than homogeneous lab inputs is in no source; it is now given as a likelihood the sources do not examine. (3) The clause "far below what airline decarbonization commitments require" was briefly replaced with IATA's own wording; the second reader restored it, because Bloomberg says most carriers "have vowed to use 10% sustainable aviation fuel (or SAF) by 2030" and that meeting that target "would require a 122-fold increase in SAF supply in the US," and The Chemical Engineer says the 10% commitment "now appears more challenging, as the shortfall in SAF supply grows more pronounced." (4) "A third or more of global waste improperly managed (dumped or openly burned)" is not what What a Waste 3.0 says; the report's executive summary says "about 30 percent of global waste is still either openly dumped or left uncollected" (13 percent openly dumped, 17 percent uncollected). The sentence now says about 30 percent, openly dumped or left uncollected. (5) The JAL investment was described as an "equity investment"; the release says JAL will "invest in Fulcrum BioEnergy, Inc." with a share of 900 million yen and does not use the word equity. Now "investment, September 2018." (6) The plant was called "a $200 million gasification plant"; Bloomberg says it "cost more than $200 million to build." Now "more than $200 million." (7) The cement-like material was "in places 10 feet high, rendering it inoperable"; Bloomberg says "more than 10 feet thick" and that it "caused the plant to shut down again." The sentence now follows Bloomberg. (8) Three sentences on the chemistry (nitrogen, chlorine and sulfur compounds producing acidic gases; lab tests on pre-sorted feedstocks; gas-cleaning technologies unable to handle MSW syngas) are in none of the sources. They are now labelled the write-up's working assumption, chlorine and sulfur are dropped, and The Chemical Engineer's own lesson (extensive testing and pilot phases before scaling up) is added from the post-mortem. (9) "Chlorinated" syngas and "chlorine-bearing materials" in the unlock section are likewise unsupported and now read "acidic syngas" and "nitrogen-bearing and other acid-forming materials." (10) The working note gave Tees Valley as "$500M+" and said both projects "failed on the same corrosion problem"; The Chemical Engineer's 2016 news item gives a writedown of US$900m–US$1bn and quotes Air Products only on "design and operational challenges," while the 2024 post-mortem is the source for the similar corrosion. The note now says that. (11) The Red Rock Biofuels note said "likely related issues"; the 2026-08-20 note below already found this unsupported. The Lake County Examiner says the Lakeview plant "sits unfinished, never having contributed to the company's mission" and that the principal owed on the bonds was $299,050,000, with the foreclosure auction set for Feb. 9, 2023; the bullet now says the plant was never finished and that corrosion is not a supported cause. Confirmed in the sources and left as written: Fulcrum raised over $1 billion; operations began in 2022; the company launched in 2007 with a plant first planned for 2010; the quoted sentence on nitric acid and its attribution to an internal company report (Bloomberg; The Chemical Engineer attributes the same sentence to the Financial Post); the February 2023 railcar holding 350 gallons; the plant shut in May 2024 and the Chapter 11 filing in September 2024; the Tees Valley cancellation in April 2016, the US$900m–1bn writedown, and the quoted "additional design and operational challenges" sentence; The Chemical Engineer's statement that Tees Valley eight years earlier "experienced significant NOx emissions and nitric acid corrosion of downstream piping"; SAF at 1 million tonnes and 0.3% of jet fuel in 2024; 2.56 billion tonnes of waste in 2022; United's $30 million in 2015; Cathay Pacific as an investor. No title changed. Genome tags untouched.