| 초록 |
Sewage sludge, a byproduct of water purification plant, can be used to produce bio-oil because of its high organic content. Dewatered sewage sludge (DWSS) cannot be used directly in the boiler for combustion or co-combustion purposes as it inherits a high moisture content (80–90 wt%). In this study, DWSS was employed to liquefy at sub-/supercritical state and the effect of reaction parameters including temperature (300-400˚C), time (30-120min), reaction pressure (20-40MPa) and varying different solvent ratios (alcohol/water) were investigated. The highest yield of bio-oil (70%) with high calorific value (36 MJ kg-1) was obtained when a mixture of ethanol/water (70/30) was used. The conversion (＞95%) in ethanol/water mixture was observed as compared to pure water case and producing a minimal amount of coke. For the characterization of oil; TAN, moisture ( |
