1. UNIT 4: ENVIRONMENTAL SCIENCE 302 LOCH

2. Fine Sand Coarse Sand Pebbles Beaker Coffee Filter

3. How sure are you? CREATE A KWL CHART

4. Each student reads the next slide

5. Can you really flush a fish down the toilet and have it go back to the ocean? How is the water treated? Do you really drink your wastewater? Where does all of the waste go?

7.  What are the types of waste? › Name everything that could be “waste” › Activity at end of class  What are the SOURCES of waste? › Focus on WasteWater  What is the fate of waste? › Focus on WasteWater › Process of WasteWater Treatment  Special Topics

8.  Toilet  Sink  Washing Machine  Dishwasher  Your house, a laboratory, an industrial factory, etc…

9.  PHYSICAL PROCESS  Filtering large particles  goes to landfill  Settle large particles  on to secondary  removes ~60% of suspended solids from wastewater.

10.  BIOLOGICAL  Bacterial growth promoted, then killed › Aeration encourages bacterial growth  puts O 2 back into water › Bacteria decompose waste – yum! › Bacteria are killed via chlorine (usually)  Removes >90 percent of suspended solids.

11.  CHEMICAL & PHYSICAL  “optional”  Reduce pollutants of “special concern” › Nutrients like Nitrates and Phosphates…why?  Uses coagulating chemicals & a 2 nd filter

12. WATER  Into a lake or river  ocean  Crops/Golf course SLUDGE  Lagoon  Incinerator  Crop fertilizer

13. Beauty Products Medicine Engine Oil Paint Lawn Care Products Photographic Chemicals Used Cooking Oil Fat from cooking Bacon Diapers Condoms

15.  http://www.youtube.com/watch?v=Q7b Vx8FBx5s&feature=related http://www.youtube.com/watch?v=Q7b Vx8FBx5s&feature=related  Start at 20sec

17.  Wastewater tx plants will always be in the basin of a watershed…why?

18.  Recycles wastewater to drinking water  Video clip

19.  Boiling  Using Sun’s Rays to disinfect  Lifestraw  Purification plants How’s this linked to life expectancies? Natural Disasters? Hiking?

20. Grit Filters (to remove large matter) Sedimentation tank Trickling filter Aeration Secondary filters Wastewater from city To stream Tertiary treatment

21. Primary Filters (to remove large matter) Flocculation tank Sedimentation tank Rapid / slow sand filtration Chlorination Water from rivers / lakes To tanks in the city

22.  Fill in more items in the “L” column of your KWL

24.  What does it include? › Brainstorm a list of 5 contents  Where does it come from? › Brainstorm a list of 5 contents  Why should humans care?

25.  Why are we concerned about water usage if the law of conservation of matter is true?

27.  Disease-causing pathogens can destroy food chains  Organisms die ….leading to low oxygen levels via decomposers › May be due to increased algal growth or more directly via toxic kills  Chlorine compounds and inorganic chloramines can be toxic to aquatic invertebrates, algae and fish;  Bioaccumulation › Metals, such as mercury, lead, cadmium, chromium and arsenic can build up a food chain unknown effects  Pharmaceutical and personal care products may cause unknown effects …

28.  http://ga.water.usgs.gov/edu/wwvisit.ht ml http://ga.water.usgs.gov/edu/wwvisit.ht ml  Stages of treatment, purpose of a treatment plant