lect 17

Question 1

homework reading for flocculation and coagulation process?

Answer 1

Question 2

what is the double layer compression mechanism?

Answer 2

Question 3

what is the electrical double layer?

Answer 3

Question 4

what process(es) is/are occurring?

Answer 4

Question 5

what is the table of cationic, anionic, and neutral polymeric flocculants used in water and wastewater treatment?

Answer 5

Question 6

what is the case study on arsenic removal?

Answer 6

Question 7

arsenic case study

Answer 7

Question 8

what is surface sorption by solids and what are the major categories?

Answer 8

finely divided solids have excess surface energy because of an imbalance of chemical forces among surface atoms, ions and molecules

major categories:
-surface sorption of solids: adsorption to sediments
-solute exchange of bottom sediments: reducing conditions leads to high reactivity, leaching of products back into the water (exchange of cations is most important exchange)
-organic contaminants bound to humic substances

Question 9

what is the exchange with sediments?

Answer 9

Question 10

Question 11

how do we know the CO2 levels over hundred of years (as indicated in the movie “an inconvenient truth”?

Answer 11

Question 12

what are alkylphenol polyethoxyethylates?

Answer 12

Question 13

what is the bioavailability of sediment contaminants?

Answer 13

Question 14

what is particularly important in the hydrosphere?

Answer 14

phase interactions in chemical fate and transport, hydrosphere is particularly important in fate and transport
-rivers move dissolved and suspended substances long distances
-water bodies are repositories, but movement still occurs

Question 15

what is interstitial water?

Answer 15