1. Submit your Creek Survey if you haven’t already done so.2. Which part of the water cycle is MOST responsible for

polluting surface water?3. Municipalities (towns) get drinking water from which two

sources?a) Oceans and ice sheetsb) Rivers and aquifers (ground water)c) Ice sheets and riversd) Aquifers (ground water) and oceans

4. What is a water table and how is it affected by humans? How is it affected by the water cycle?

Warm Up p27

Date Session

Activity Page

1/12-131/14-15

2021

Biotic Index activityWater Treatment Notes

2627

Water Treatment Inquiry 28Homework: Read pages 50-66CAnswer questions 1-5 (p57C); 1-3 (p66C)

8.E.1 Understand the hydrosphere and the impact of humans impact of humans on local systems and the effectseffects of the hydrosphere on humanson humans.

8.E.1.3 Predict the safety and potability of water Predict the safety and potability of water supplies in North Carolina based on physical and based on physical and biological factorsbiological factors, including: Temperature, Dissolved oxygen, pH, Nitrates and phosphates, Turbidity, Bio-indicators

8.E.1.4 Conclude that the Conclude that the good health good health of humans of humans requiresrequires: Monitoring of the hydrosphere, Water quality standards, Methods of water treatmentMethods of water treatment, Maintaining safe water quality, Stewardship

TLW create a water treatment system with given materials, analyze and evaluate his/her system using outcome, notes

In 1972, Congress passed this law to help protect and restore the surface fresh water resources (lakes, streams and riversa0 of this country. The goals of the Clean Water Act were simple--water should be clean enough for fishing, swimming and other recreational uses.

The Environmental Protection Agency (EPA) sets and enforces water quality standards for wastewater and pollution.

Clean Water Act 1972

How a Septic System Works…

“Friendly” Bacteriaused to treatwaste water.

Water Treatment

What materials need to be removed from your drinking water?

What qualities do you want in your drinking water (requirements before you drink it)

If our water is polluted…

How do we make water safe to drink and use for

everyday life?

“ The Sparkling Water Story”

Listen and follow along as you see firsthand how we impact the cleanliness of our water everyday!

Wastewater (the dirty water than runs into our drains) must be cleaned before it can go into lakes, rivers, etc.

Wastewater Treatment Lab: Create your own wastewater

treatment system!!1. Examine the materials your group may use.

Carbon needs to be “rinsed” before use.2. Using the whiteboard, sketch/outline the

steps and materials you will use to clean your water.

3. Test your process

On page 28 of your notebook:1. Sketch you design and outline your process

on page 28 of your notebook2. Test your process…were you successful?3. What concerns do you still have about the

quality/safety of your water?

Wastewater Treatment

Steps to the Wastewater Treatment

CycleLabel these

steps in your diagram of your model!

Water Treatment Stepspage 27 of your notebook

http://www.youtube.com/watch?v=9z14l51ISwg

AerationCoagulationSedimentationFiltrationDisinfection

1. Aeration Adds air to water

Allows gases trapped in the water to escape and adds oxygen

2. Coagulation

Dirt and other suspended solid particles are chemically “stuck” together into floc so they can easily be removed from water

Step 2. Coagulation

Coagulation is the process at which chemicals are added so that dirt and other particles stick together into “floc” so they can easily be removed

3. Sedimentation

gravity is used to pull particles of floc to the bottom of the waste container

Step 3. Sedimentation

Sedimentation: the heavy particles settle to the bottom and the clear water moves on

4. Filtration

water is passed through sand and carbon filters to remove most of the impurities that remain after coagulation and sedimentation

Step 4. FiltrationFiltration: The water passes through filters made of different materials

5. Disinfection

disinfectants (eg chlorine) are added to the water to purify it and kill any organisms that may be harmful. UV radiation is also used to kill protozoa.

Step 5. Disinfection

Disinfection: A small amount of chemicals are added to kill bacteria

Storage or ReturnStorage: Water is stored in a closed tank to be used by the community

Return: water is aeratedto reduce chlorine levels,then returned to localrivers.

Pressure causes the solvent (water) solvent (water) to pass through a membrane to the lower concentrated solution, leaving a higher concentration of solute (pollutants) solute (pollutants) on one side, and only solvent solvent (water) (water) on the other.

Reverse Osmosis

What didn’t get removed?

Quick write: p.27

How might a society’s wastewater treatment affect the function and development of a society?

Virtual Tour of a Drinking Water Treatment Plant

http://www.epa.gov/ogwdw/watertreatmentplant/flash/index.html

Toxic Water: The Sewers of Mexico City

http://www.youtube.com/watch?v=3a_4YhxN2vo&feature=fvst