Results (
Thai) 2:
[Copy]Copied!
Working volume of a photobioreactor was approximately
3 l, and its diameter and depth were approximately
14 and 30 cm, respectively. Each reactor was
illuminated by two incandescent lamps (60 W) for 12 h
a day. Observed light intensity at the surface of the reactor
was 5800 lux. The reactor was a complete mixed
type and the hydraulic retention time (equal to sludge
retention time) was kept approximately 6 days. The
reactors were purged with nitrogen gas. Rps. palustris
was pre-cultured for 2 weeks under constant light
condition in the simulated wastewater that (per liter)
contained 2.83 g (500 mgC l−1) of CH3COONa·3H2O
as a carbon source instead of glucose. After the precultivation,
approximately 50mLof anaerobic digested
sludge from an activated sludge treatment plant were
added as a source of anaerobic heterotrophic bacteria.
The SS ratio of the added digested sludge to biomass of
purple non-sulfur bacteria in the reactor was 30–50%.
Oxidation–reduction potential (ORP), temperature
and pH were monitored. The value of pH was automatically
adjusted at 7.0±1.0 by pH controllers (SIBATA,
Japan) with 1N HCl and 1N NaCl. Bacteria cells
attached on the wall of the reactor were stripped off
with magnet equipments once a day.
Being translated, please wait..
