Chapter 22. Water Pollution. Types of Water Pollution. Explosion in algal, bacteria, & decomposer populations. ↑ Enrichment. Fish kills. ↑ Biological oxygen demand. ↓ Oxygen levels in water. Sewage. Types of Water Pollution.
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Explosion in algal, bacteria, & decomposer populations
↑Biological oxygen demand
↓Oxygen levels in water
Fecal coliform test
Low sediment load
High sediment load
Lead affects practically all systems within the body. It is a powerful neurotoxin that interferes with the development of the brain and central nervous systems as well as the kidney and blood-forming organs and can cause a wide range of health effects.
Impacts on cognitive thinking, memory, attention, language, and fine motor and visual spatial skills have been seen in children exposed to methylmercury in the womb.
Elemental (metallic) mercury primarily causes health effects when it is breathed as a vapor where it can be absorbed through the lungs.
- Equivalent of the Mississippi River,
- Sewage, industrial wastes, sediment
- >16 million Italians depend on the river for drinking water
- Pollution is so bad, swimming has been suspended in parts, jeopardized tourism and fishing
- Water contaminated with disease-causing organisms
- Led to cholera and diarrhea outbreaks
- In 1980s world health organizations, sponsored digging wells
- Unfortunately, naturally occurring arsenic led to wide-spread poisoning
Collected from reservoir or ground water.
Distributed to customers
Wastewater collected as sewage
Primary and Secondary Sewage Treatment
Effectiveness of primary, secondary, and tertiary sewage treatment