lecture 20 - 21:34 ExamfinalFriday5/812:00theusual...

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21:34 Exam final Friday 5/8 12:00 the usual. Map of the great lakes. There are some particular places where there has been atrophication. A lot of  polluted environments subject to an agreement to valuable water sources.  Some kind of horseshell that breeds exponentially, threatens life of cailifornia  plant life, can not be stopped. Abandoned wells must be sealed, if you have a well at your home and you don’t  use it then you have to get it professionally sealed. It’s a risk for groundwater  contamination.  You also want to have septic systems (in homes) 100 ft away from wells. Its safer.  In reference to waste water: Stage 1. Primary mechanism: first you get rid of large things in the water (all  kinds of material, animals, etc). you want to remove suspended solids (SS) AND  biochemical oxygen demand (bod). 20-25% removal rate The second stage, biology stage: now include the biological, you want to up the 
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lecture 20 - 21:34 ExamfinalFriday5/812:00theusual...

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