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③第一沈殿池(英語:英語音声) 3. Primary Sedimentation Tank
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2~3時間かけて下水を流し、下水に含まれる沈みやすい汚れを沈殿させます。

Suspended solids in the wastewater settles to the bottom as wastewater slowly flows through the tank for 2 to 3 hours.

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