Modeling Coupled Dynamic Processes in Landfills: Holistic Long-Tern Performance Management to Improve Sustainability

垃圾填埋场耦合动态过程建模：整体长期绩效管理以提高可持续性

• 批准号: 1537514
• 负责人: Krishna Reddy
• 金额: $ 27.93万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537514&HistoricalAwards=false
• 关键词: Modeling; Coupled; Dynamic; Processes; Landfills

Many engineered landfills that accept municipal solid waste are classified as "dry tomb landfills" because waste degrades very slowly due to low moisture conditions. As an alternative, bioreactor landfills have emerged to counter those conditions. In bioreactor landfills, leachate recirculation systems increase moisture and accelerate degradation. The performance of bioreactor landfills results from coupled hydro-bio-mechanical processes; however, industry lacks a comprehensive, holistic mathematical model that considers and effectively analyzes these coupled processes in landfills. This project will develop a new coupled mathematical tool to enable the design and operation of stable, effective and sustainable engineered landfills, thereby minimizing long-term risks to the surrounding environment and public. The tool will enable practitioners and regulators to predict the highly complex landfill stabilization period, and allow for the planning of beneficial reuse of landfill space, such as recreational facilities, by accurately accounting for a differential settlement and stabilization period. With controlled, predictable, rapid municipal solid waste decomposition and a reduced stabilization period: (a) non-degradable municipal solid waste may be mined and processed, reducing the amount of landfill mass encapsulated within a landfill; (b) post-closure monitoring can be shortened and associated expenditures considerably reduced; and (c) concerns about the long-term performance of geosynthetic liners and related environmental risks can be addressed. This research involves multiple disciplines, including geoenvironmental engineering, sustainable engineering, biology, and computational mechanics. The multi-disciplinary research will provide a unique opportunity to underrepresented groups to participate in research.The proposed modeling tool will combine and simultaneously solve a two-phase flow model, a large-strain explicit mechanical model, and a first-order decay biodegradation model. The model will account for concurrent changes in waste properties to predict coupled processes in landfills. Specifically, the project scope will include: (a) development of a new mathematical model that can account for heterogeneous waste, two-phase flow, and coupled hydro-bio-mechanical processes, and effectively predict spatial and temporal behavior of landfills, (b) model validation with laboratory and field studies to attain a confidence level in the accuracy of the modeling results, (c) prediction of spatial and temporal landfill settlement, slope stability and shear response of liner systems due to coupled processes, (d) assessment of the major system variables that control the performance of landfills based on probabilistic analysis, and (e) application of the tool for forensic investigation of past landfill failures. The project will provide a tool for designing stable and effective engineered landfills and optimizing existing landfills using coupled hydro-bio-mechanical processes.

许多接受城市固体废物的工程垃圾填埋场被归类为"干墓垃圾填埋场"，因为废物降解非常缓慢，由于低水分条件。 作为替代方案，生物反应器填埋场已经出现，以应对这些条件。 在生物反应器填埋场，渗滤液再循环系统增加了水分，加速了降解。 生物反应器填埋场的性能是由耦合的水力-生物-机械过程引起的;然而，工业界缺乏一个全面的、整体的数学模型来考虑和有效地分析填埋场中的这些耦合过程。该项目将开发一种新的耦合数学工具，以实现稳定，有效和可持续的工程垃圾填埋场的设计和运营，从而最大限度地减少对周围环境和公众的长期风险。 该工具将使从业人员和监管机构能够预测高度复杂的填埋场稳定期，并通过准确计算差异沉降和稳定期，规划填埋场空间的有益再利用，如娱乐设施。 通过有控制的、可预测的、快速的城市固体废物分解和缩短稳定期：（a）不可降解的城市固体废物可被开采和加工，减少填埋场内包裹的填埋体数量;（B）可缩短关闭后的监测，并大大减少相关支出;以及（c）可以解决对土工合成衬垫的长期性能和相关环境风险的关注。 这项研究涉及多个学科，包括地质环境工程，可持续工程，生物学和计算力学。多学科的研究将提供一个独特的机会，代表性不足的群体参与研究。拟议的建模工具将联合收割机，并同时解决一个两相流模型，大应变显式力学模型，和一阶衰变生物降解模型。 该模型将考虑废物性质的同时变化，以预测填埋场的耦合过程。具体而言，项目范围将包括：（a）开发一种新的数学模型，该模型可以解释异质废物、两相流和耦合的水力-生物-机械过程，并有效地预测填埋场的空间和时间行为，（B）通过实验室和实地研究验证模型，以使模型结果的准确性达到置信水平，（c）预测填埋场的空间和时间沉降，斜坡稳定性和衬垫系统的剪切响应，由于耦合的过程，（d）评估的主要系统变量，控制填埋场的性能基于概率分析，和（e）应用的工具，过去的垃圾填埋场故障法医调查。 该项目将提供一种工具，用于设计稳定和有效的工程填埋场，并利用耦合的水力-生物-机械过程优化现有的填埋场。