Water that contains obvious contaminates as indicated by its appearance, smell, etc.
Water that contains infectious microbes or toxic substances.
Changes in an area of water that render it hospitable to plant life and inhospitable to animal life, such as when microbes metabolize the available oxygen in a location.
A chemical process that measures the oxygen demanded by organisms from a body of water; it is conducted by measuring how much oxygen is utilized from a water sample over time.
A segment of the ocean that is near the shoreline and contains most of the nutrients and microorganisms.
The general ocean floor where microbes live—but in lower numbers than in other parts of the ocean and in forms quite different from terrestrial organisms.
Deep trenches in the ocean floor where microbes live—but in lower numbers than in other parts of the ocean and in forms quite different from terrestrial organisms.
Infectious agents in fresh water
V. cholera, legionella, E. coli, shigella, g. lamblia, cryptosporidium, E. hystolytica, adenovirus, rotavirus, poliovirus
infectious agents of marine water
dinoflagellates such as pfiesteria piscicida and hep A virus
Any process of cleaning water for use by humans, including the removal of gravel, harmful chemicals, and microbes by the use of filtration and chemical processes.
A process that degrades and removes particulate matter from water and kills harmful microorganisms.
Solids left over after a water treatment.
A step in the sewage treatment process.
The use of living organisms as a remedy to an environmental problem, such as adding phosphorous and nitrogen to water contaminated with crude oil to encourage the growth of naturally occurring bacteria that degrade crude oil.
A group of Gram-positive bacteria that grow in a branching filament structure and are found in most soils, including deserts.
A fungal group that grows mutualistically with plant roots
Mutualistic groups of algae and fungi wherein fungi protect the algae and help them nutritionally, while the algae fix nitrogen from the air into forms used by fungi and also provide organic nutrients for the fungi.