preserving water sources

wastewater treatment

Fresh water is also preserved by purifying wastewater. Wastewater is water that has been used for cleaning, washing, flushing, or manufacturing. It includes the water that goes down your shower drain and that is flushed down your toilet. Instead of dumping wastewater directly into rivers, wastewater can be purified at a water treatment plant ( Figure 1.2). When wastewater is recycled, waterborne diseases caused by pathogens in sewage can be prevented. What are some ways you can save water in your own house?

preserving water sources

It might seem like there is plenty of water on Earth, but thats not really the case. Water is a limited resource. That means that it is used faster than it is replaced. Theoretically, at some point in time, the supply of fresh water could run out. Though this is unlikely, it is possible. But it is a significant issue in parts of the world with large populations. As these populations continue to grow, the supply of water becomes an increasingly important issue. Even though we have lots of water in our oceans, we cannot use that water whenever we want. It takes special equipment, such as a desalination plant, and a lot of energy (and money) to convert salt water into fresh water. Of all the water on Earth, only about 1% can be used for drinking water. Almost all of the rest of the water is either salt water in the ocean or ice in glaciers and ice caps. As a result, there are water shortages many places in the world. Since we have such a limited supply of water, it is important to preserve our water supplies. Therefore, steps have been taken to prevent water pollution. Technologies have also been developed to conserve water and prevent water pollution. Sub-Saharan African countries have the most vulnerable water supplies. Some scientists believe of a potential future crisis in both Asia and Africa from pollution and depletion of natural water resources. Many countries in the Middle East are at an extreme risk of water shortages. Diminished water supplies could increase the risk of both internal conflicts or wars between countries.

preventing water pollution

In the U.S., concern over water pollution has resulted in many federal laws. Some of these laws go all the way back to the 1800s! The laws prohibit the disposal of any waste into the nations rivers, lakes, streams, and other bodies of water, unless a person first has a permit. Growing concern for controlling water pollutants led to the enactment of the Clean Water Act in 1972. The Clean Water Act set water quality standards. It also limits the pollution that can enter the waterways. Other countries are also actively preventing water pollution and purifying water ( Figure 1.1). A water purification station in France. Contaminants are removed to make clean water.

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instructional diagrams

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questions

theoretically the supply of fresh water could run out.

-->  a. true

b. false

there are drinkable water shortages in many places of the planet.

-->  a. true

b. false

recycling wastewater is tremendously helpful. which of the following produces wastewater?

a) water that has been used in washing clothes

b) water that has been used in flushing the toilet

c) water that has been used in showering

-->  d) all of the above

most of earths water

a) is not drinkable.

b) is in the oceans and ice caps.

c) is saltwater.

-->  d) all of the above

the clean water act

-->  a) prevents the illegal dumping of contaminants into the water supply.

b) prevents the illegal use of clean water.

c) sets guidelines for water recycling.

d) all of the above

what is an advantage of recycling wastewater?

a) recycling wastewater produces fresh water.

-->  b) recycling wastewater can help prevent waterborne diseases.

c) recycling wastewater increases the amount of water on earth.

d) all of the above

of all the water on earth, only about _ % can be used for drinking water.

a) 0.1

-->  b) 1

c) 2

d) 10

diagram questions

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