Chapter 14

Waste water
Water that has been used and contaminated
Biological Oxygen Demand
amount of dissolved oxygen needed by aerobic decomposers to break down organic materials
Dead zone
In a body of water, an area with extremely low oxygen concentration and very little life
A phenomenon in which a body of water becomes rich in nutrients
Indicator species
species that serve as early warnings that an ecosystem is being damaged
Fecal coliform bacteria
a standard measure and indicator of disease potential
Septic system
Small waste water system used by a single home or business.
Manure lagoon
A man-made outdoor earthen basin filled with animal waste that undergoes anaerobic respiration as part of a system designed to manage and treat refuse created by Concentrated Animal Feeding Operations (CAFOs).
Polychlorinated biphenyls
Used as an insulating material in dielectric oil and may be present in electrical equipment.
Thermal pollution
Harm to lakes and rivers resulting from the release of excessive waste heat into them
Clean Water Act
1973 law that restricted the pollution of water by industry and agriculture
Safe Drinking Water Act
set maximum contaminant levels for pollutants that may have adverse effects on human health.