Contaminants in water
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11.2. Contaminants in Water. Contaminants are undesirable substances in a solution. Drinking water that contains contaminants can be hazardous to both plants and animals. Human activities can result in many different contaminants entering the water.

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Contaminants in water

11.2

Contaminants in Water

  • Contaminants areundesirable substances in a solution.

  • Drinking water that contains contaminants can be hazardous to both plants and animals.

  • Human activities can result in many different contaminants entering the water.

    • These include herbicides,pesticides, andfertilizers from agriculture, salt from salting the roads in winter, and other toxic chemicals and heavy metals.

  • Biological contaminants are organisms that live in the water and can make us sick.

    • These include micro-organisms (like bacteria), parasites, and organic matter such as animal feces.

contaminant

fertilizer

herbicide

pesticide


Fresh water and salt water

11.1

Fresh Water and Salt Water

  • Only 3 % of Earth’s water is fresh water, the rest is salty.

  • Even so, “fresh water” does not always mean “water suitable for drinking.”

  • Salinity refers to the amount of salt dissolved in water, and is expressed either as a percentage or as a concentration in g/L.E.g. the Dead Sea is a 30 % salt solution, or 300 g/L

  • Water that contains salt has a greater density than fresh water.

  • Salt water can be converted to fresh water. Desalination is any process that removes salt from water, producing pure water and salt.

  • Some desalination technologies involve using renewable energy sources, such as energy from the Sun, or from underground.

salinity

concentration

desalination


Water is life

12.6

Water is Life

  • Over 1 billion people on Earth (one-sixth of the world population) do not have access to safe drinking water, while others waste water daily.

  • The world’s first “Water Day” was March 22, 2005. This day marked the start of the “Water for Life” decade, when the UN announced a ten-year target to achieve:

    • To reduce by half the number of people that do not have access to safe drinking water and basic sanitation by the year 2015.

  • Access to sufficient clean water is a fundamental human right.

  • Access to clean water is crucial to everyone for health, food production, and economic development.

  • Then why do the “water-rich” nations treat water as a product they can package and sell?


Group work
Group Work

  • Read the Articles INDIVIDUALLY

    • Ask for help on the terms or ideas in the article if you need any

  • As a group discuss what your articles were about

  • Using the chart paper, write down the main points that you have found in the articles

    • What is the article about?

    • What are the article’s main points

    • Interesting Facts

    • Solutions to the problem (if given)

  • As a group: give a 5 min presentation to the class about your articles

    • Please do not read the articles at the front of the class – use the charts you have made in class!


Homework
Homework

  • Make a Wiki post about your ideas on the topics discussed


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