noun
wastewater; liquid waste; black water
Refers to water discharged from homes, factories, or other facilities after use, often containing contaminants. Used in environmental and engineering contexts.
工場からの廃水は適切に処理されなければならない。
Wastewater from factories must be properly treated.
この地域では廃水の再利用が進められている。
In this region, the reuse of wastewater is being promoted.