Sewage Sludge

SLUDGE (Scripting Language for Unhindered Development of a Gaming Environment) is a shareware adventure game engine developed by Hungry Software. It combines a scripting language with other IDE tools (including a sprite bank editor and a floor region editor). Freeware and commercial adventure games can be created with the engine.
See more at Wikipedia.org...

For other meanings see: Sludge (disambiguation).Sludge is the residual semi-solid material left from industrial, water treatment, or wastewater treatment processes.When fresh sewage or wastewater is added to a settling tank, approximately 50% of the suspended solid matter will settle out in about an hour and a half. This collection of solids is known as raw sludge or primary solids and is said to be "fresh" before anaerobic processes become active. Once anaerobic bacteria take over, the sludge will become putrescent in a short time and must be removed from the sedimentation tank before this happens.
See more at Wikipedia.org...

Sludge produced at a Publicly Owned Treatment Works, the disposal of which is regulated under the Clean Water Act.