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APES Ch. 14 Vocab
Water Pollution - AP Environmental Science, Chapter 14
Term | Definition |
---|---|
Water pollution | The contamination of streams, rivers, lakes, oceans, or groundwater with substances produced by human activities and that negatively affect organisms |
Point-source pollution | Comes from a specific location such as a factory that pumps its waste into a nearby stream or a sewage treatment plant that discharges wastewater into the ocean |
Nonpoint-source pollution | Comes from diffuse areas such as an entire farming region |
Wastewater | Water produced by human activities, including human sewage from toilets and grey water from washing clothes and dishes - keeping it from contaminating drinking water is difficult |
Oxygen-demanding waste | Organic matter that enters a body of water and feeds the growth of microbes that are decomposers - because these microbes require oxygen to decompose the waste, they use up more oxygen |
Biochemical oxygen demand (BOD) | The amount of oxygen a quantity of water uses over a period of time at a specific temperature - lower BOD values indicate less pollution |
Dead zones | Areas where there is little oxygen and little life (self-perpetuating because they cause organisms to die and demand more oxygen) |
Eutrophication | An abundance of fertility in a water body |
Cultural eutrophication | When a body of water experiences an increase in fertility due to anthropogenic inputs of nutrients |
Indicator species | An organism that indicates whether or not disease-causing pathogens are likely to be present |
Fecal coliform bacteria | The best indicators for potentially harmful water (ex: E. coli) - usually harmless bacteria that live in intestines |
Septic system | A personal sewage treatment system that contains a septic tank and a leach field - found mostly in rural areas |
Septic tank | A large container that receives wastewater from the house - water flows in one end, forms three layers (scum, water, sludge), before flowing out the other end |
Sludge layer | Anything heavier than water that sinks in a septic tank |
Septage | The layer of fairly clear water in a septic tank |
Leach field | The pipes that the water flows into after being in a septic tank and the field it's absorbed in |
Manure lagoons | Large, human-made ponds lined with rubber where manure is broken down by bacteria so it can be spread on fields as fertilizer |
Lead | A heavy metal that contaminates water flowing through old pipes - can cause brain, nervous system, and kidney damage primarily in infants and fetuses |
Arsenic | A compound that occurs naturally in Earth's crust and can easily dissolve into groundwater, leading to high concentrations - associated with cancer development |
Mercury | A heavy metal that we produce primarily by burning coal - we consume methylmercury primarily through fish, and it can damage the CNS of young children |
Acid deposition | Sulfuric and nitric acid from smokestacks that return to Earth several miles away |
Polychlorinated biphenyls (PCBs) | Industrial compounds used in manufacturing plastics and insulating electrical transformers until 1979 - carcinogens that still persist in the environment |
Polybrominated diphenyl ethers (PBDEs) | Flame retardants added to a wide variety of items to decrease flammability but that has been found in fish, aquatic birds, human breast milk, etc. |
Non-chemical water pollution | Solid waste pollution (garbage), sediment pollution (can decrease the amount of water entering natural waterways), thermal pollution (when human activities cause a substantial change in the temperature of water) |
Thermal shock | A dramatic change in temperature that can kill many species |
Clean Water Act | Supports the protection and propagation of fish, shellfish, wildlife, and recreation, by maintaining/restoring chemical, physical, and biological properties or natural waters - also defines acceptable amounts of pollution |
Safe Drinking Water Act | Sets the national standards for safe drinking water and establishes maximum contaminant levels (MCLs) for 77 elements in surface and groundwater |