Water chlorination e sewage treatment plant: o que têm em comum

1. Passo 1. Water chlorination — é utilizado em — Plumbing. Tap water is disinfected.
2. Passo 2. Plumbing — funciona como — Aqueduto. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.
3. Passo 3. Aqueduto — funciona como — Sewerage. Both systems carry water by gravity through channels: one drains waste, the other supplies water; the drains of Mohenjo-daro are older than the Roman aqueducts.
4. Passo 4. Sewerage — tem como parte — Sewage treatment plant. Treatment plants.

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