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This documents defines general terms in the field of the collection, transport, treatment, discharge (and reuse) of wastewater and in the field of sludge treatment, utilisation and disposal. This document provides the general basis for the terms and definitions in the preparation or revision of all standards within the field of wastewater engineering. The aim of this document is to harmonize all conflicting terms and definitions of CEN standards within its scope to avoid inconsistencies in the translated standards that could lead to misunderstandings and misinterpretations. The responsible German body is Working Committee NA 119-05-10 AA "Begriffe der Abwassertechnik" ("Terminology in the field of wastewater engineering") at the DIN the Standards Committee Water Practice (NAW).