Waste water lab prewrite

Copy and paste these directions into a new Google Doc titled “Last Name-Sewer Science Pre-Lab.”  You can turn this is by posting it to your blog, emailing as an attachment or link, or as a paper copy next class.  The following questions and statements are suggestions straight from our lab rubrics.  Remove the numbers and questions in your response.
Planning:

1. Of sedimentation, aeration, and disinfection, which is the most effective at purifying waste water?

1. Identify the following variables.

   Independent Variable (units)	Waste water
   Dependent Variable (units)	Cleanliness of water after purification
   Constant Variables	same water run through each test
   Control	pure water

   1. What relevant background information would be useful to reader’s of your lab?  
   1. This is normally done in paragraph form.  Make sure to cite sources. Consider these questions:
   1. Waste water is up to 50 percent of the water in the Tualatin river. Waste water consists of 27 percent of municipal water if it were to be reused.
   2. Primary treatment is used to remove floatable and settleable solids. Water sits still and the solids are removed from the top and bottom, leaving suspended and dissolved solids in the water. Secondary treatment uses microorganisms to remove solids further, microorganisms attach themselves to solids in aeration (air is pumped in to support microorganisms), then microorganisms are removed in Secondary clarification, leaving less suspended and organic solids in the water. Tertiary treatment uses chemicals. Polymer and alum are added to the water making a sludge with the solids in it, sinking to the bottom to be removed. Water then goes through a mixed medium filter of sand, coal, and garnet sand to remove small particles, and then gets dechlorinated before being returned to a source.
   3. Clean water costs millions of dollars (13million for one plant) but can return enough water to make up a quarter of all water used by people if recycled. Treated wastewater also makes up a large portion of american rivers, by being clean our rivers stay clearer. There are many jobs in waste water management, creating a nice boost to the economy.
   4. One advantage is to see how effective water treatment is, and if effective, could help raise the possibility of reusing waste water. A disadvantage is that many of the ingredients in the “waste water” are just representations of waste and may or may not behave the same as regular waste.
   5. Sources: http://www.nytimes.com/2012/02/10/science/earth/despite-yuck-factor-treated-wastewater-used-for-drinking.html?_r=2&scp=1&sq=yuck%20factor&st=cse and the presentation last class
   1. What is your procedure/method?
   1. Measure waste and record exact amount used
   2. Add to 1 liter of water
   3. Discuss what each type of “waste” represents
   4. Collect representative samples
   5. Analyze the waste water
   6. Observe sedimentation tank
   7. Analyze waste water
   8. Transfer waste water to Aeration Basin
   9. Analyze results from Biological Treatment after Flocculation and Sedimentation
   10. Set filter by lab sink
   11. unclasp bottom tube
   12. transfer 2 liters of water from sedimentation tank through basin with filter pour first liter down sink
   13. add 2 drops of bleach per liter, stir and let sit 10 minutes
   14. test quality of filtered water
   1. What are your predictions?
   
   my guess is that the sedimentation tank will remove the most water because the large surface area of the sediment will catch a lot of the contaminants.
   2. pollution in parts per million
   1. at least a million parts per test