Which conversion route suits which kind of waste?+
Gasification with O₂ or steam fits dry, carbon-rich solids. MSW, RDF, biomass, plastics, and produces syngas suitable for synthesis. Pyrolysis suits plastics and biomass when bio-oil or char are valuable products. Anaerobic digestion is the right fit for wet, biological feedstocks (food waste, sludge, agricultural slurries) and yields biogas. Plasma gasification handles difficult mixed streams at higher cost. Hydrothermal routes target wet biomass without prior drying. We screen the routes against the feedstock you actually have, not an idealised composition.
How do you handle the variability of real waste feedstocks in process design?+
By designing for the bad days, not the brochure. Feedstock characterisation up-front (moisture, ash, chlorides, alkali, sulphur, plastics fraction), explicit operating-window definition, oversized gas cleanup where contaminants are unpredictable, and buffer storage to smooth variability into the conversion step. The economics get stress-tested against feedstock scenarios, not a single design point.
Is waste-derived hydrogen "green," "blue," or something else?+
It depends on the feedstock and what happens to the CO₂. Hydrogen from biogenic waste with CO₂ vented can be low-carbon; with the biogenic CO₂ captured and used or stored, it can be net-negative. Hydrogen from fossil-origin waste (e.g. mixed plastics) sits closer to grey or blue hydrogen depending on capture. Lifecycle assessment with honest waste-attribution rules is the only way to settle this for a specific project.
Can waste conversion compete economically without subsidies or gate fees?+
Sometimes. The economics typically lean on three levers: a gate fee for taking the waste, the value of the product (hydrogen, fuel, chemical), and policy support for low-carbon outputs. Projects with a strong gate fee and a high-value product can stand on their own; commodity-product projects generally rely on a combination. We model each lever explicitly so the project's dependency on subsidy is visible.
How does gas cleanup change between feedstocks, and why is it usually the hardest part?+
Each feedstock brings different contaminants, tars, particulates, chlorides, alkali, sulphur, heavy metals, at different concentrations. Downstream synthesis catalysts are intolerant of even trace contaminants, so the cleanup train has to deliver synthesis-grade gas across the worst feedstock days. It's where most waste-conversion projects underestimate engineering scope, and where we spend disproportionate design effort.
Do you work on biological routes as well as thermal ones?+
Yes. Anaerobic digestion, biogas upgrading and microbial fermentation routes are in scope. The engineering disciplines are different from thermal conversion, but the chain-level questions, feedstock variability, gas cleanup, integration with downstream synthesis or grid, are the same.