Environmental Engineering Reference
In-Depth Information
It is expected that new research works can focus on the combined photoinduced
and microbial degradation of DOM and of the photoproducts of the process, to
understand a whole feature of the biogeochemical process of DOM in the aquatic
environment.
8 Nomenclature
DFOM Deferoxamine mesylate
DOC
Dissolved organic carbon
DOM
Disscolved organic matter
−
−
2
)
DIC
Dissolved inorganic carbon (CO
2
+
H
2
CO
3
+
HCO
3
+
CO
3
GCM Group contribution method
H
2
O
2
Hydrogen peroxide
LMW Low molecular weight
HO
•
Hydroxyl radical
SS PM Sea-salt particulate matter
Problems
(1) Describe the various biogeochemical functions of DOM for photoinduced
and microbial processes in natural waters
(2)
Explain why the photoinduced degradation of DOM varies for a variety of
natural waters.
(3)
Explain the theoretical model for photoinduced degradation process in aque-
ous media.
(4)
Explain the mechanism of the photoinduced degradation of DOM in natural
waters.
•
(5)
of func-
tional groups bonded to DOM and explain the group contribution method
(GCM) to predict the HO
•
reaction rate constants.
(6) What is the methanogenesis? Explain the chemical reactions that are
involved in the formation of CH
4
from methyl-coenzyme
M
reductase.
(7) What are the controlling factors for the photoinduced degradation of DOM?
Describe four important factors that can regulate the DOM Photoinduced
degradation in aqueous solution.
(8) What are the controlling factors for the microbial degradation of DOM?
Describe two of the important factors.
Explain the mechanism for the photoinduced degradation by HO
(9)
List the various end photo products generated from the photoinduced deg-
radation of DOM in natural waters. Explain what end products are vital for
microbial processes in the aquatic environments.
