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Anaerobic
Anaerobic conditions under wastewater transport and treatment imply that neither nitrate, sulphate nor oxygen are present for the decomposition of organic matter.
Anoxic
Anoxic conditions, as for anaerobic conditions, indicate the absence of pure oxygen. However, compounds such as nitrate or sulphate can be present under anoxic conditions.
ATEX
ATEX is an abbreviation of a French term used to denote an explosive atmosphere.
Axial fan
An axial fan is a type of fan where both motor and wings are mounted directly on the axle.