Question

Explain the main processes in primary,
secondary and tertiary sewage treatment.​

Answer 1

Answer:

There are three basic biological treatment methods: the trickling filter, the activated sludge process, and the oxidation pond. A fourth, less common method is the rotating biological contacter

Answer 2

Answer:

There are three basic biological treatment methods: the trickling filter, the activated sludge process, and the oxidation pond. A fourth, less common method is the rotating biological contacter.

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