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Chapter 14 Water Pollution

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Water Pollution
The contamination of streams, rivers, lakes, oceans, or groundwater with substances produced through human activities negatively affects both aquatic and terrestrial organisms.
Point sources - distinct locations that pump waste into a waterway (wastewater discharge via pipes, smokestacks)
Non-point sources - diffuse areas such as an entire farming region that pollutes a waterway (runoff from golf courses, parking lots, etc.)
Human and animal waste; organic compounds; inorganic substances; synthetic organic compounds; non-chemical pollutants
Qs: What’s the Source? Negative effects on humans and environment? Solutions?
Point vs. Non-point sources of pollution
Human Wastewater
Water produced by human activities such as human sewage from toilets and gray water from bathing and washing clothes or dishes.
Three concerns about human wastewater:
Bacterial decomp of waste creates high demand for oxygen in the water
(BOD - biological O2 demand)
Low BOD means less wastewater pollution
High BOD means more wastewater pollution
Eutrophication due to nutrients (N, P) released from wastewater decomposition (cultural eutrophication)
Algae blooms → algae death/decomp → hypoxia → dead zones
Wastewater can carry a variety of disease-causing organisms (pathogens: viruses, bacteria, parasites)
Cholera, typhoid fever, diarrheal diseases, hepatitis, etc.
Indicator test: Fecal coliform bacteria (E. coli)
Septic Systems
Large container that receives wastewater from house; rural Scum, septage, sludge layers
Bacterial decomp of waste into CO2 and inorganic nutrients Leach field absorbs septage; natural filtration system
Sludge must be pumped out every 5-10 years (more frequent 2~5 years)
Sewage Treatment Plants
Centralized plants in populated areas that receive wastewater via a network of underground pipes.
Sewage Treatment
Primary treatment
Removal

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