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
 
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