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Sewage treatment
[als] Kläranlage
[ar] معالجة الصرف الصحي
[ba] Ташландыҡ һыуҙы таҙартыу
[bar] Kleaolog
[bg] Пречистване на отпадни води
[bn] পয়ঃশোধন
[ca] Tractament d'aigües residuals
[cs] Čištění odpadních vod
[de] Abwasserentgiftung
[es] Tratamiento de aguas residuales