Bean dregs wastes, used as substrate, came from Shanghai University
canteen. In dry basis, bean dregs present a high content in
cellulose (about 70 wt%). Before the experiments, the dried bean
dregs were milled for 10 min using a mixer (HR170, Philips Corp.)
at the maximum speed setting, and then were sieved. The portion
under 140 mesh was collected for tests. Bean dregs were suspended
in deionized water to about 3.3 wt% solids content (1 g in 30ml of
deionized water). Then, the feeding suspension was injected into a
batch reactor when the temperature and pressure of the vessel got
to the condition of experiment.