Self-heating in compost piles due to biological effects

M. I. Nelson*, T. R. Marchant, G. C. Wake, E. Balakrishnan, X. D. Chen

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةArticleمراجعة النظراء

28 اقتباسات (Scopus)


The increase in temperature in compost piles/landfill sites due to micro-organisms undergoing exothermic reactions is modelled. A simplified model is considered in which only biological self-heating is present. The heat release rate due to biological activity is modelled by a function which is a monotonic increasing function of temperature over the range 0 ≤ T ≤ a, whilst for T ≥ a it is a monotone decreasing function of temperature. This functional dependence represents the fact that micro-organisms die or become dormant at high temperatures. The bifurcation behaviour is investigated for 1-d slab and 2-d rectangular slab geometries. In both cases there are two generic steady-state diagrams including one in which the temperature-response curve is the standard S-shaped curve familiar from combustion problems. Thus biological self-heating can cause elevated temperature raises due to jumps in the steady temperature. This problem is used to test a recently developed semi-analytical technique. For the 2-d problem a four-term expansion is found to give highly accurate results-the error of the semi-analytical solution is much smaller than the error due to uncertainty in parameter values. We conclude that the semi-analytical technique is a very promising method for the investigation of bifurcations in spatially distributed systems.

اللغة الأصليةEnglish
الصفحات (من إلى)4612-4619
عدد الصفحات8
دوريةChemical Engineering Science
مستوى الصوت62
رقم الإصدار17
المعرِّفات الرقمية للأشياء
حالة النشرPublished - سبتمبر 2007

ASJC Scopus subject areas

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