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8. Troubleshooting
Here are presented experiences from the Finnish tests at Savon Sellu.
The weighing mechanism in the homogenizer has needed more calibration and the result
should be verified with other method, too.
It was also noticed that the feed mixture used was highly foamy. The foam, combined with
below-zero temperature outside, clogged the pipe that was supposed to let the gases out of
the reactor as well as the tube going to the gas analyzer. After that it was decided that the run
would be canceled. The pipe got re-modified, pH-adjustment solution changed and antifoaming chemical got added to the next run.
Sample taking and pH adjusting in the bioreactor turned out to be slightly difficult at first.
During the whole testing period several modifications were made to make it more userfriendly and to avoid any unnecessary splashing.
Picture 23 Upgraded pH adjusting system.
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