城市生活垃圾厌氧消化的熵分析

Analysis of Entropy During Anaerobic Digestion of Municipal Solid Waste

在城市生活垃圾厌氧消化的整个过程中,从熵的角度出发,对其进行分析,得出如下结论:(1)在厌氧消化的前处理系统(收集、分选及底物强化等)中,收集是一个熵增过程,分选是一个熵减过程,而预处理强化则是一个熵减过程(。2)通过以葡萄糖为发酵底物的发酵过程的ΔG的分析可知:在水解产酸阶段,ΔGθ<0,反应自发进行,故该过程的ΔS﹥0,即该过程是一个熵增过程;在产氢产乙酸阶段,ΔS<0,故这是一个熵减过程,但后续反应对氢的利用则可能使该阶段变为一个熵增过程;在产甲烷阶段,ΔGθ<0,反应均自发进行,故该过程的ΔS﹥0,即该过程是一个熵增过程(。3)城市生活垃圾厌氧发酵产物的资源化利用是一个熵增过程(。4)分选、溶胞强化、产氢产乙酸及发酵产物的资源化利用等工序可能成为厌氧消化的限速步骤。

Anaerobic digestion （AD） technology of municipal solid waste （MSW） is developing quickly. The livelong process of AD of MSW in terms of entropy was analyzed, and results indicated that in the pretreatment such as collecting, separating and material enhancement of AD, the collecting is a process of entropy increasing （PEI）, the separating is a process of entropy decreasing （PED） and the enhancement of material is PED. The reuse of MSW output of AD is PEI. The restrictive speed of AD may be collection, dissolving cell, hydrogen-producing acetogens and resource of fermentable relict.