|
KMID : 1024520220310070609
|
|
Journal of the Environmental Sciences
2022 Volume.31 No. 7 p.609 ~ p.616
|
|
|
Improving Anaerobic Digestion of Polyhydroxybutyrate by Thermal-Alkaline Pretreatment
|
|
Trang Le Thi Nhu
Lee Joon-Yeob
|
|
|
Abstract
|
|
|
|
In this study, the effect of different reaction times for thermal-alkaline pretreatment on the solubilization and biogasification of polyhydroxybutyrate (PHB) were evaluated. Thermal-alkaline pretreatment tests were performed at 73 °C and pH 13 at 0-120 h reaction times. The mesophilic anaerobic batch tests were performed with untreated and pretreated PHB samples. The increase in the pretreatment reaction time results in a 52.8-98.8% increase of the abiotic solubilization efficiency of the PHB samples. The reaction time required to achieve solubilization efficiencies of 50%, 90%, and 95% were 10.5, 52.0, and 89.6 h, respectively. The biogasification of the untreated PHB samples achieved a specific methane production rate of 3.6 mL CH4/g VSS/d and require 101.3 d for complete biogasification. The thermal-alkaline pretreatment significantly improved specific methane production rate (10.2-16.0 time increase), lag time (shortened by 76-81%), and time for complete biogasification (shortened by 21-83%) for the biogasification of the PHB samples when compared to those of the untreated PHB samples. The improvement was higher as the reaction time of the thermal-alkaline pretreatment increased. The findings of this study could be used as a valuable reference for the optimization of the biogasification process in the treatment of PHB wastes.
|
|
|
KEYWORD
|
|
|
Polyhydroxybutyrate, Thermal-alkaline pretreatment, Hydrolysis, Anaerobic digestion, Methane production
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|