Biogas Upgrading: Membrane Separation to Biomethane

Raw biogas from anaerobic digestion is only half-finished energy: roughly 55–65% methane diluted with carbon dioxide, too weak in energy density for pipeline injection or vehicle fuel. This simulator models the polymer membrane skid that fixes that — a real solution-diffusion separation governed by the Weller-Steiner cross-flow equations — letting you tune membrane selectivity, the feed/permeate pressure ratio and total membrane area (stage cut) while watching individual CH₄ and CO₂ molecules stream down a 3D module and CO₂ permeate away through the membrane wall. Live readouts track retentate purity, methane recovery, methane slip and permeate CO₂ purity, and a 2-stage cascade toggle shows the standard industrial fix for the fundamental purity-vs-recovery trade-off every biomethane plant has to balance.