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.

许多接受市政固体废物的工程垃圾填埋场被归类为“干墓垃圾填埋场”，因为由于水分条件低，废物的降解非常缓慢。 作为替代方案，已经出现了生物反应器垃圾填埋场来应对这些条件。 在生物反应器垃圾填埋场中，渗滤液再循环系统会增加水分并加速降解。 生物反应器垃圾填埋场的性能是由耦合的水力发电过程产生的。但是，行业缺乏一个全面的整体数学模型，该模型考虑并有效地分析了垃圾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操作，从而最大程度地减少对周围环境和公众的长期风险。 该工具将使从业者和监管者能够预测高度复杂的垃圾填埋场稳定期，并通过准确考虑差异化和稳定期，从而计划对垃圾填埋场（例如娱乐设施）的有益重复使用。 随着受控，可预测的快速市政固体废物分解和降低的稳定期：（a）可以开采和处理不可降解的市政固体废物，从而减少了垃圾填埋场内包封的垃圾填埋场质量的数量； （b）可以缩短关闭后监控，并大大减少相关支出； （c）可以解决对地理合成衬里和相关环境风险的长期性能的担忧。 这项研究涉及多个学科，包括地理环境工程，可持续工程，生物学和计算机制。多学科研究将为代表性不足的群体提供参与研究的独特机会。拟议的建模工具将结合并同时解决两相流量模型，大型的显式机械模型和一阶衰减生物降解模型。 该模型将考虑废物特性的同时变化，以预测垃圾填埋场中的耦合过程。 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,斜率稳定性和由于耦合过程引起的衬里系统的剪切响应，（d）评估基于概率分析的垃圾填埋场性能的主要系统变量，以及（e）将工具应用于对过去垃圾填埋场失败的法医研究。 该项目将提供一种工具，用于设计稳定有效的工程垃圾填埋场，并使用耦合的水力发电过程来优化现有的垃圾填埋场。