2.4.1.1. Continuous system 1. In this system effect of the wastewater
composition, the residence time, the amount of yeast extract,
and the wastewater flow rate was tested. In order to investigate the
effect of wastewater composition two different synthetic wastewaters
were prepared as explained in Section 2.3.1. The flowrate
of the synthetic wastewater was adjusted as 0.351 mL/min. The
experiments were lasted until the system reached the steady state
conditions. In the experimental set in which the residence time
effect on the performance was investigated, the number of reactors
was increased from two to four to ensure a longer residence
time and the feed flow rate was 0.351 mL/min. The system was also
inoculated with a rinse solution from the forest residues (50.5 g
wood chips of forest residues rinsed with 400mL 0.9% NaCl) in
order to add new microorganisms which had different capability
for degradation of organic compounds. In order to investigate the
effect of the yeast extract addition, the amount of yeast extract was
increased from 1 g/L to 2 g/L in the synthetic dye mixture. The effect
of the wastewater flow rate was also tested by increasing the rate
from 0.351 mL/min to 0.803 mL/min.