Earth: The Water Planet
Published on Nov 18, 2015
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PRESENTATION OUTLINE
2.2 WATER TO DRINK
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KEY TERMS
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WATER QUALITY
The measurements of the substances in water besides water molecules
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CONCENTRATION
The amount of one substance in a certain volume of another substance
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pH
The measurement of how acidic or basic the water is
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HARDNESS
The level of the minerals calcium and magnesium in water
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FILTRATION
The process of passing the water through a series of screens that allows water through, but not larger solid particles
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COAGULATION
The process by which particles in a liquid clump together
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SEWAGE
Wastewater containing human wastes
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KEY CONCEPTS
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WHAT FACTORS CAN AFFECT
WATER QUALITY?
1. Certain substances, iron, which can affect the taste or color
2. Chemicals or microorganisms which can be very harmful
WHY IS DRINKING WATER OFTEN TREATED?
To ensure that it is clean and safe to drink
Photo by Klearchos Kapoutsis
WHAT OFTEN HAPPENS
TO WASTEWATER?
1. Treatment plants
2. Septic systems
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OFTEN ASKED QUESTIONS
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WHAT IS A SEPTIC SYSTEM?
A septic system is a wastewater treatment system centered around an underground tank containing bacteria that treat wastewater as it passes through, also known as a septic tank.
Photo by Soil Science @ NC State
HOW DOES HARD WATER DIFFER FROM SOFT WATER?
Hard water contains high levels of calcium and magnesium. Soft water, on the other hand, contains lower levels of calcium and magnesium.
Photo by Kino Praxis
WHAT IS THE ORDER IN WHICH THE
SEPTIC SYSTEM TREATS SEWAGE?
1. Sewage flows into the septic system
2. Bacteria breaks down waste material into simpler chemicals
3. Cleaner water leaves the tank and flows into a leach field
Photo by Soil Science @ NC State
