Environmental Engineering Reference
In-Depth Information
Table 11.4
(continued)
No
The process
Organisms
Key enzyme
Advantages
Disadvantages
6
Temporal separa-
tion of oxygenic
photosynthesis
with accu-
mulation of
polysaccha-
rides and dark
fermentative H
2
production
Proved for some
cyanobacteria with
reversible hydrogenase
(
hoxYH
) and marine
microalgae
Hydrogenase
Converts light energy into H
2
fuel; long
term process; possibility to repeat the
cycle “oxygenic photosynthesis-dark
fermentative H
2
production”
Low rates; high sensitivity to oxygen
inactivation; organic acids (especially
acetate) as by-products