Contaminants in water
This presentation is the property of its rightful owner.
Sponsored Links
1 / 5

Contaminants in Water PowerPoint PPT Presentation


  • 114 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Contaminants in Water

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


  • Login