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- Salinity
The concentration of dissolved salts, such as sodium chloride and water
- Saturated
The condition of a liquid when it has taken into solution the maximum possible quantity of a given substance at a given temperature and pressure or in the case of the soil, a condition, in which, the soil or rock layers are completely full of water
- Secondary sludge
The sludge produced from the secondary clarifier in a wastewater treatment plant
- Secondary treatment
Second step in most waste treatment systems, in which bacteria break down the organic parts of sewage wastes; usually accomplished by bringing the sewage and bacteria together in trickling filters or in the activated sludge process
- Septic system
A domestic wastewater treatment system
- Sewage
The waste and wastewater produced by residential, commercial and industrial sources and discharged into sewers
- Sewage Pollution
The waste and wastewater produced by residential and commercial sources
- Sewer
A system of underground pipes that collect and deliver wastewater to treatment facilities or streams
- Sludge
Solid matter that settles to the bottom of sedimentation tanks in a sewage treatment plant and must be disposed of by digestion or other methods or recycled to the land
- Solid wastes
Any unwanted or discarded material that is not a liquid or a gas. Includes organic wastes, paper products, metals, glass, plastic, cloth, brick, rock, soil, leather, rubber, yard wastes, and wood, but does not include sewage and hazardous materials
- Spring tides
Tides with the greatest range between highs and lows, usually occurring during the full or new moon
- Surface runoff
Precipitation, snow melt, or irrigation in excess of what can infiltrate into soil surface that flows across the land surface
- Surface Tension
A phenomenon caused by a strong attraction towards the interior of the liquid action on liquid molecules in or near the surface in such a way to reduce the surface area. The tension that results is usually expressed in dynes per centimeter (cm) or ergs per square centimeter
- Surface water
Water that is on the Earth’s surface, such as in a stream, river, lake, or reservoir