Environmental Engineering Reference
In-Depth Information
General Scheme
Anaerobic Reductive Dechlorination
FeSO
4
- Rates/Conc.
Seed Inoculum
- Hudson river
Tween 80
- Sorption/Availability
Aerobic PCB Dechlorination
Genes
Organisms
- Burkholderia LB400 (G −)
- Rhodococcus RHA1 (G+)
ohb, fcb
G+/
−
Cassettes
Inocula Technology
- Vermiculite
Low, Medium and High Solids
Reactors
Figure 6.2
Sequential anaerobic-aerobic PCB remediation strategy.
due to the actions of different species of microorganisms, have been recog-
nized on the basis of their congener specificities (Table 6.1).
In Table 6.1, dechlorination process M, for example, removes both
flanked and unflanked meta-chlorines. A flanked meta-chlorine is one that
is adjacent to another (ortho- or para-) chlorine. An unflanked chlorine has
no other chlorine next to it. Not fully captured in Table 6.1 is the fact that
these processes also vary in their abilities to attack more heavily chlorinated
Table 6.1
Regiospecificities of the Various
Described PCB Dechlorination Processes
Dechlorination
Activity
Susceptible Chlorines
M
Flanked and unflanked meta
Q
Flanked and unflanked para
H
Flanked para
Doubly flanked meta
H'
Flanked para
Meta of 2,3- and 2,3,4- groups
P
Flanked para
N
Flanked meta
T
Meta of hepta- and octa-CBs
LP
Unflanked para
