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”，因为废物由于湿度低而降解非常缓慢。 作为替代方案，生物反应器垃圾填埋场的出现就是为了应对这些情况。 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水力生物机械耦合过程的结果；然而，业界缺乏一个全面、整体的数学模型来考虑和有效分析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。 该工具将使从业者和监管机构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沉降和稳定期来规划垃圾填埋场空间（例如娱乐设施）的有益再利用。 通过受控、可预测、快速的城市固体废物分解并缩短稳定期： (a) 可以开采和处理不可降解的城市固体废物，从而减少垃圾填埋场内的垃圾填埋量； (b) 可以缩短关闭后监测时间并大幅减少相关支出； (c) 对土工合成材料衬垫的长期性能和相关环境风险的担忧可以得到解决。 这项研究涉及多个学科，包括地球环境工程、可持续工程、生物学和计算力学。多学科研究将为代表性不足的群体参与研究提供独特的机会。所提出的建模工具将结合并同时求解两相流模型、大应变显式力学模型和一阶衰减生物降解模型。 该模型将考虑废物特性的并发变化，以预测垃圾填埋场的耦合过程。具体来说，该项目范围将包括：（a）开发一种新的数学模型，可以解释异质废物、两相流和耦合的水力生物机械过程，并有效预测垃圾填埋场的空间和时间行为，（b） ) 通过实验室和现场研究进行模型验证，以获得建模结果准确性的置信度，(c) 预测垃圾填埋场的时空沉降、边坡稳定性和耦合过程引起的衬垫系统的剪切响应，(d) 评估控制垃圾填埋场性能的主要系统变量基于概率分析，以及 (e) 应用该工具对过去垃圾填埋场故障进行法证调查。 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，并利用水力生物机械耦合过程优化现有垃圾填埋场。