LIFE CYCLE ASSESSMENT TO DESIGN FRY-DRYING PROCESS OF INDUSTRIAL BIOMASS
Nowadays, the disposal of sewage sludge is getting more difficult. Thermal process treatments require high energy inputs to produce a biomass containing low amount of moisture. Furthermore, the combustion of sludge and more generally wet biomass requires supplemental fuel to allow a minimal temperature in the furnace. The fry-drying process presents a potentially convenient method for the combined disposal of sludge and waste oil, and valorization of the final fry-dried sludge in bio-fuel 1, 2. The transformation of the wet biomass is organized in two successive reactors, namely, a fryer reactor followed by a solid-liquid separator. Energy recovery is part of the process. The vapor generated is compressed by mechanical compression to a pressure where it can be condensed in the heat exchanger; it can thereby supply the energy needed to sustain the process. Generally, vapor is recycled in the process by providing a low technical power to the compressor. The aim of this study is to look at the environmental impacts of fry-drying process compared to those of conventional air-dryer, by using<<Life cycle assessment (LCA) >> (methodology). The latter is a diagnostic tool based on an inventory of the, matter and energy flows-input and output-for all the stages of the life cycle of the process. This study was prepared according to the standards ISO 14040 3, which organize LCA in four steps: (1) goal and scope definition, (2) life cycle inventory analysis, (3) life cycle impact assessment and (4) interpretation. Therefore, the first phase of this work consisted in the definition of the two process of drying ending, with the choice of the quantitative references and the special limitations of each one. Then, after the life cycle inventory, the IMPACT2002+methodology is was chosen for impacts assessment 4. Thanks to it, eleven midpoint impact categories gathered into four endpoint damage categories were considered. As for the calculation of the scores of impacts and damages, it was performed with the MathWorks software (MATLAB). Finally, the fry-drying process was expanded in various energy scenarios, including the process of mechanical vapor compression and energy recovery to preheat the frying oil and the wet biomass.
Life cycle assessment Fry-drying Air-drying Combustion Esterification Transport Sewage sludge Recycled cooking oil
Romdhana M. H. Busset G. Appin Y. Montréjaud-Vignoles M. Lecomte D. Simon V. Sablayrolles C.
Université de Toulouse, MINES ALBI, RAPSODEE UMR CNRS 2392, ALBI, France, F 81013 Université de Toulouse, INPT, LCA (Laboratoire de Chimie Agro-Industrielle), ENSIACET, 4 Allées Emil
国际会议
北京
英文
1303-1310
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）