Every municipal wastewater plant on the planet uses one of three biological treatment paths — or a hybrid. The branches grew over a century; the roots haven't changed. Click around to see them all.
Five families, twenty-something variants. Each node opens a detail card on the right: how it works, where it shines, where it doesn't, and which neighbours to look at. Coloured by family.
Click a family on the left, then a variant. Or jump straight into a leaf — every tech card cross-links to its closest cousins.
Both grow bacteria in suspension to eat the organics. Conventional Activated Sludge uses rectangular tanks with bottom diffusers. Carrousel (oxidation ditch) uses an oval racetrack with surface aerators. Toggle the lens to see which one wins on what.
A schematic, a description, four options. Click your guess — we'll tell you why. Beats memorising 11 acronyms cold.
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Three knobs: size, effluent target, and reuse purpose. The recommendation updates live. Not a sales pitch — just the design pattern most engineers default to for that combination.
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