Round clarifier tank and barrel: what they have in common

1. Step 1. Round clarifier tank — is part of — Sewage treatment plant. Separating sludge from the treated water.
2. Step 2. Sewage treatment plant — uses — Fermentation. Activated sludge is microbes.
3. Step 3. Fermentation — is used in — Brewing. Yeast ferments the sugars of the malt.
4. Step 4. Brewing — uses — Barrel. Beer and wine were stored and transported in barrels.

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