열적-알칼리성 전처리 유무에 따른 폴리하이드록시부티레이트의 고온 혐기성 소화 영향 연구 = Thermophilic Anaerobic Digestion of Polyhydroxybutyrate with and without Thermo-alkaline Pretreatment

다국어 초록 (Multilingual Abstract)

The study investigated the effect of thermo-alkaline pretreatment on the solubilization of polyhydroxybutyrate (PHB) and its potential to enhance of thermophilic anaerobic digestion, focusing on biochemical methane potential (BMP) and methane production rate, using two different particle sizes of PHB (1500 μm and 400 μm). Thermo-alkaline pretreatment tests were conducted at 90 °C for 24 hours with varying NaOH dosages from 0-80% (w/w). BMP tests with untreated PHB exhibited methane production ranging from 150.4~225.4 mL CH4/g COD and 21.5~24.2 mL CH4/g VSS/d, indicating higher methane production for smaller particle sizes of PHB, 400 μm. Thermo-alkaline pretreatment tests achieved a 95.3% PHB solubilization efficiency when 400 μm PHB particles were treated with 80% NaOH dosage at 90 °C for 24 hours. BMP tests with pretreated PHB showed substantial improvement in thermophilic anaerobic digestion, with an increase of up to 112% in BMP and up to 168% in methane production rate. The results suggest that a combined pretreatment process, including physical (400 μm PHB particles) and thermo-alkaline (90 °C, 40-80% NaOH dosage, and 24 hours reaction time), is required for high-rate thermophilic anaerobic digestion of PHB with enhanced methane production.