Here are the answer to your questions:
1) At one time, there were 3 x 20 m3 batches (there were many more than this, and this was the largest batch in one day).
2) The initial MEG concentration was approximately 42 %, and the final concentration was over 99 %.
3) The batch running time was approximately 8 hours.
4) The centrifuge was small (electric motor, 120 volts), approximately 24" diameter.
5) It was a generic centrifuge.
I wish you the best.