2.2 Pre-treatment Technologies of Anaerobic Fermentation
19
Fig. 2.6 The fluorescence EEM of the DOM fractions in different hydrothermal pre-treatments
with the control, the peak B also red-shifted to longer wavelengths (by 5–25 nm).
Besides, the intensity of fluorescence peak in regions I and II was higher than that
in other regions. As temperature was raised and heating intervals were prolonged, it
can be seen that peak B showed a continuously increasing intensity and the highest
fluorescence intensity was 2.5 times that of the control. According to the results,
the hydration ionisation was enhanced substantially, which prompted liquefaction
of crude proteins added with 40% of water below 200 °C for 70 min. Peaks C
and D disappeared after hydrothermal pre-treatment, indicating hydrothermal pretreatment being capable of humic acids, degrade fulvic acid, and other refractory
macromolecular materials, thus strengthening their bioavailability.
2.2.1.6 Impacts of Hydrothermal Pre-treatment on Anaerobic
Fermentation
The changes of hydrogen and methane contents during anaerobic fermentation of
mixed phase of kitchen wastes through different hydrothermal pre-treatments are
19
Fig. 2.6 The fluorescence EEM of the DOM fractions in different hydrothermal pre-treatments
with the control, the peak B also red-shifted to longer wavelengths (by 5–25 nm).
Besides, the intensity of fluorescence peak in regions I and II was higher than that
in other regions. As temperature was raised and heating intervals were prolonged, it
can be seen that peak B showed a continuously increasing intensity and the highest
fluorescence intensity was 2.5 times that of the control. According to the results,
the hydration ionisation was enhanced substantially, which prompted liquefaction
of crude proteins added with 40% of water below 200 °C for 70 min. Peaks C
and D disappeared after hydrothermal pre-treatment, indicating hydrothermal pretreatment being capable of humic acids, degrade fulvic acid, and other refractory
macromolecular materials, thus strengthening their bioavailability.
2.2.1.6 Impacts of Hydrothermal Pre-treatment on Anaerobic
Fermentation
The changes of hydrogen and methane contents during anaerobic fermentation of
mixed phase of kitchen wastes through different hydrothermal pre-treatments are