Cycles Gone Wild Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Microbial Corrosion

A
  • chemolithoautotrophs
  • metal and non-metalic materials
  • aerobic (bac oxidize iron–> iron oxides + hydroxides or oxidize sulfur –> sulfuric acid) and anaerobic (ie. Sulfate-reducing bac–> hydrogen sulfide== sulfide stress cracking + form part of biofilm) env.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Biogenic sulfide corrosion

A
  • bac mediated process forming (1) hydrogen sulfide gas
    (2) sulfuric acid attacks concrete/steel matrix of wastewater pipes –> aerobic sulfide oxidation reaction == H2SO4
    (3) all within a biofilm (therefore there is an areobic and anaerobic) = anaerobic sulfate reduction (SRB)

–> pipes lead to cycling of sulfur

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Acid mine drainage

A
  • AMD
    (1) pyrite (FeS2) is exposed to O2 and h2o == AMD w/ pH less then 2.0 therefore increases metal solubility
    (2) autooxidation and microbial oxidation of pyrite generates sulfuric acid (H2SO4)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly