TABLE OF CONTENTS A board that prevents scum floating out with the stream of effluent. Those provided at the outlet from sedimentation tanks in wastewater treatment are about 0.45 m high, projecting 75 to 150 mm above the surface and dipping about 0.3 m below it across the full width of the channel.
A trough in or beside a sedimentation tank, down which the scum flows away. For horizontal flow sedimentation tanks the scum trough should be at the inlet end.
A weir with an adjustable crest that can be lowered to remove scum. Often a scraper pushes the scum over the scum weir to the scum trough.
Small diameter gravity sewers. See small bore sewers.
Sludge drying reed bed. See reed bed treatment.
Safe Drinking Water Act.
Strategic Environmental Assessment Directive.
See MARPOL , North Sea conferences , Oslo convention.
Pipes on the seabed or tunnels in rock that are used to discharge wastewater or treated effluents into the sea. Tunnels have the advantage that ships dragging their anchors cannot break them, which may happen to pipes. Tunnels may be more expensive or impracticable. See diffuser (2).
A stream that normally goes dry during a year.
See saline intrusion.
An inertial separator consisting...
