A process for producing ethanol from kitchen waste was developed in this study. The
process consists of freshness preservation of the waste, saccharification of the sugars in
the waste, continuous ethanol fermentation of the saccharified liquid, and anaerobic
treatment of the saccharification residue and the stillage. Spraying lactic acid bacteria (LCB)
on the kitchen waste kept the waste fresh for over 1 week. High glucose recovery (85.5%)
from LCB-sprayed waste was achieved after saccharification using Nagase N-40 glucoamylase.
The resulting saccharified liquid was used directly for ethanol fermentation,
without the addition of any nutrients. High ethanol productivity (24.0 g l1 h1) was
obtained when the flocculating yeast strain KF-7 was used in a continuous ethanol
fermentation process at a dilution rate of 0.8h1. The saccharification residue was mixed
with stillage and treated in a thermophilic anaerobic continuous stirred tank reactor
(CSTR); a VTS loading rate of 6 g l1 d1 with 72% VTS digestion efficiency was achieved.
Using this process, 30.9 g ethanol, and 65.2 l biogas with 50% methane, was produced from
1 kg of kitchen waste containing 118.0 g total sugar. Thus, energy in kitchen waste can be
converted to ethanol and methane, which can then be used as fuels, while simultaneously
treating kitchen waste.
A process for producing ethanol from kitchen waste was developed in this study. Theprocess consists of freshness preservation of the waste, saccharification of the sugars inthe waste, continuous ethanol fermentation of the saccharified liquid, and anaerobictreatment of the saccharification residue and the stillage. Spraying lactic acid bacteria (LCB)on the kitchen waste kept the waste fresh for over 1 week. High glucose recovery (85.5%)from LCB-sprayed waste was achieved after saccharification using Nagase N-40 glucoamylase.The resulting saccharified liquid was used directly for ethanol fermentation,without the addition of any nutrients. High ethanol productivity (24.0 g l1 h1) wasobtained when the flocculating yeast strain KF-7 was used in a continuous ethanolfermentation process at a dilution rate of 0.8h1. The saccharification residue was mixedwith stillage and treated in a thermophilic anaerobic continuous stirred tank reactor(CSTR); a VTS loading rate of 6 g l1 d1 with 72% VTS digestion efficiency was achieved.Using this process, 30.9 g ethanol, and 65.2 l biogas with 50% methane, was produced from1 kg of kitchen waste containing 118.0 g total sugar. Thus, energy in kitchen waste can beconverted to ethanol and methane, which can then be used as fuels, while simultaneouslytreating kitchen waste.
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