Eco-efficiency and entropy generation evaluation based on emergy analysis: Application to two small biogas plants
作者： G. Merlin , H. Boileau
DOI: 10.1016/J.JCLEPRO.2016.12.117
关键词:
摘要: Abstract The research presented in this paper demonstrates how emergy analysis can be used to measure the eco-efficiency of unit operation processes (UOP). To illustrate this, two small biogas plants France were analyzed, both with a nominal production almost 300 Nm3/d. One plant is an Upflow Anaerobic Sludge Blanket (UASB) digester treating dairy effluents while other Continuous Stirred Tank Reactor (CSTR) farm cogeneration power 45 kWe. objectives study show: (a) long-term sustainability UASB and CSTR by assessing respective eco-efficiencies using analysis; (b) whether holistically account for true benefits plants; (c) energy change or transformation generated any UOP systems. Energy revealed some dysfunctions results show that it possible improve anaerobic digestion efficiency process working on heat supply insulation UASB-AD (anaerobic digester) CSTR-AD plant. Emergy through ratios indices confirm was not optimal due low high sodium hydroxide consumption. For CSTR, better than transformity close 4 × 105 sej/Jbiogas same range as literature values. However, maintenance should upgraded well use digestate order kind conversion system. discussion chapter explores applicability taking into relationships between emergy, entropy generation information theory. Entropy decreases after improving sustainability, accordance maximum empower principle.
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