A process for producing ethanol from kitchen waste was
studied. Spraying LCB on kitchen waste kept the waste fresh
and therefore increased the amount of sugar recovered and
available for ethanol fermentation. Higher glucose recovery
(85.5%) in the saccharification step was achieved at 60 1C
using Nagase N-40 glucoamylase compared to other conditions
tested. The resulting saccharified liquid was shown to
be rich in nutrients supporting the growth of yeast. High
ethanol productivity (24.0 g l1h1) was obtained when the
flocculating yeast strain KF-7 was used in continuous ethanol
fermentation at a dilution rate of 0.8h1. The mixture of
saccharification residue and distillation wastewater was
subjected to anaerobic treatment; the treatment was performed
stably at a VTS loading rate of 6 g l1 d1 with 72% VTS
digestion efficiency under micro-aeration conditions. From
1 kg of kitchen waste containing 118.0 g total sugar, 30.9 g
ethanol and 65.2 l biogas with 50% methane was produced.
Therefore, kitchen waste is a promising biomass resource
with realistic, practical applications.
However, several problems must be