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Water research (Oxford), 2006-03, Vol.40 (6), p.1167-1172
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2006
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
Ammonia inhibition of biohydrogen production was investigated in batch and continuous flow reactors with glucose as a substrate. In batch tests, biohydrogen production rate was highly dependent on pH and ammonia (defined as the sum of NH
3 of NH
4
+ species) concentrations above 2
g N/L. At pH=6.2, the maximum production decreased from 56
mL/h at 2
g N/L to 16
mL/h at 10
g N/L. At pH=5.2, production decreased from 49
mL/h (2
g N/L) to 7
mL/h (16
g N/L). Hydrogen yield remained relatively constant in batch tests, varying from 0.96 to 1.17
mol-H
2/mol-glucose. In continuous flow tests, both hydrogen production rates and yields were adversely affected by ammonia. When the reactor (2.0
L) was first acclimated under batch conditions to a low nitrogen concentration (<0.8
g N/L), H
2 production and yields under continuous flow mode conditions were 170
mL/h and 1.9
mol-H
2/mol-glucose, but decreased with increased ammonia concentrations up to 7.8
g N/L to 105
mL/h and 1.1
mol-H
2/mol-glucose. There was no hydrogen production under continuous flow conditions if the reactor was initially operated under batch flow conditions at ammonia concentrations above 0.8
g N/L. It is concluded that the hydrogen production is possible at high concentrations (up to 7.8
g N/L) of ammonia in continuous flow systems as long as the reactor is initially acclimated to a lower ammonia concentration (<0.8
g N/L).