Hydrothermal carbonization of sewage sludge for solid recovered fuel and energy recovery

Improving the recovery of phenolic compounds from spent coffee grounds by using hydrothermal delignification coupled with ultrasound assisted extraction

“…As the reaction temperature increased, VM decreased significantly at higher temperature (260 °C and 3 h) (Table 2). The decrease of VM is mainly due to the formation of a higher molecular weight and cross-linking [27]; [28,29]. In contrast, FC values show an increase of 142.44ִ % at 260 °C and 3 h reaction time, and this agrees with other previous studies [21].…”

The effect of microwave hydrothermal treatment on the combustion behavior of sewage sludge

“…And the raw sludge was treated in a subcritical hydrothermal reactor with electric heater as the control group. Since hydrothermal reactions at 200 °C result in higher organic retention (Jin et al, 2020), more energy-rich hydrothermal carbon (Kim et al, 2015), and less tar production during pyrolysis (Feng et al, 2018a), final temperature was set at 200 °C with the heating rate 10 °C/ min for both the treatments. The residence time for the final temperature was 0.5 h. The slurry left in the reactor was centrifuged at 6000 revolutions/min for 10 min.…”