1. act, or process, of denitrifying. 2. a process by which nitrates and nitrites are reduced. It is commonly brought about in soil and sewage by denitrifying bacteria resulting in the escape of nitrogen into the air.
a fixture about the height of the seat of a chair that often has fixtures for running water and is used especially for bathing the external genitals and the posterior parts of the body.
a colorless gaseous hydrocarbon HC=CH made especially by the action of water on calcium carbide. Used for illuminating and in welding and soldering.
1. an opening provided in the side or top of a tank so that a light may be inserted to aid examination of the interior. 2. a vertical pipe or shaft between manholes, to enable inspection of the interior of a sewer.
1. a hole large enough only for the insertion of a hand, as for lifting, or of a hand and arm, as for cleaning out otherwise inaccessible places or giving access to enclosed parts. 2. a shallow form of manhole giving access to a top row of ducts in an underground electrical system.
the increase in depth of water in the horizontal drain at the base of a stack caused by the reduced velocity of water flowing in the horizontal pipe when receiving flow from a vertical stack.
a decrease in temperature that occurs while heating metal through a range in which a change in a structure occurs.