1) Microorganisms can break down organic matter using a wide variety of oxidants

Question

1) Microorganisms can break down organic matter using a wide variety of oxidants (electron acceptors). Write separate balanced reactions for the oxidation of sucrose (C12H22O11) to CO2 by each of the following electron acceptors: (a) oxygen; (b) nitrate (reduced to N2); (c) iron III (reduced to iron II); (d) sulfate (reduced to hydrogen sulfide, H2S ); and (e) carbon dioxide (reduced to methane, CH4).

2)Write a balanced reaction for the oxidation of phenol to carbon dioxide with oxygen as the electron acceptor.

3)Use Rittmann and McCarty tables to construct a balanced reaction for acetate oxidation with (a) oxygen as an electron acceptor (b) with nitrate as an electron acceptor.

Explanation / Answer

1a) C12H22O11(s) + 12 O2(g) 12 CO2(g) + 11 H2O()

b) 5C12H22O11+48KNO324K2CO3+36CO2+55H2O+24N2

c)

e) C12H22O11(s) + 12 O2(g) 12 CO2(g) + 11 H2O()

CO2 + 8 H+ + 8 e- -------> CH4 + 2 H2O

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