Department of Civil and Environmental Engineering, Carleton University, Ottawa, Canada.
Department of Civil and Environmental Engineering, Carleton University, Ottawa, Canada.
Waste Manag. 2020 Mar 1;104:74-81. doi: 10.1016/j.wasman.2020.01.002. Epub 2020 Jan 18.
Instrument bundles placed within the Ste. Sophie landfill (Quebec, Canada) have been collecting temperature and settlement data since January 2010. Previous modelling efforts simulated settlement based on a three-component model to account for primary or instantaneous compression, secondary compression or mechanical creep and time-dependent biodegradation-induced settlement. In northern climates where waste may be placed under frozen conditions, a time-dependent biodegradation-induced settlement term is unable to simulate settlement due to biodegradation as waste temperatures transition from below zero to optimal values for anaerobic degradation. This paper presents a temperature-dependent biodegration-induced settlement model. The model simulates heat generation as a function of temperature and tracks the expended energy as the waste degrades. The ratio of the expended energy to the total potential expended energy is used in the proposed temperature-dependent biodegradation-induced settlement term. The new term better accounts for the delayed biodegradation process observed in wastes placed under frozen conditions. The model was able to simulate the settlement trends observed at the Ste. Sophie landfill. The goal of developing and including a temperature-dependent biodegradation-induced settlement term in the model was to study the effects of operating conditions on waste settlement and stabilization. An optimized waste lift placement strategy could enhance waste stabilization and improve the airspace utilization within a landfill, simultaneously bringing increased revenues to landfill operators while decreasing the post closure environmental burden of landfills.
自 2010 年 1 月以来，放置在 Ste. Sophie 垃圾填埋场（加拿大魁北克省）的仪器套件一直在收集温度和沉降数据。先前的建模工作基于三组件模型模拟沉降，以考虑主压缩或瞬时压缩、次压缩或机械蠕变以及随时间变化的生物降解引起的沉降。在废物可能在冻结条件下放置的北方气候中，由于废物温度从零下过渡到厌氧降解的最佳值，随时间变化的生物降解引起的沉降项无法模拟由于生物降解引起的沉降。本文提出了一种随温度变化的生物降解引起的沉降模型。该模型模拟了温度的热量产生，并跟踪废物降解过程中消耗的能量。所提出的随温度变化的生物降解引起的沉降项中使用了消耗能量与总潜在消耗能量的比值。该新术语更好地解释了在冻结条件下放置的废物中观察到的延迟生物降解过程。该模型能够模拟 Ste. Sophie 垃圾填埋场观察到的沉降趋势。在模型中开发和包含随温度变化的生物降解引起的沉降项的目的是研究操作条件对废物沉降和稳定的影响。优化的废物提升布置策略可以增强废物的稳定性，并提高垃圾填埋场内的空气空间利用率，同时为垃圾填埋场运营商带来更多收入，同时减少垃圾填埋场的闭场后环境负担。
