含气体收集系统的层状垃圾填埋场复合覆盖系统中挥发性有机化合物（VOCs）迁移的二维分析模型

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-09-18 DOI:10.1002/nag.70082

Xiting Gu, Haijian Xie, Chao Zhou, Xiaobin Chen

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引用次数: 0

摘要

层状覆盖结构被广泛应用于垃圾填埋场的环境屏障，以减少恶臭气体的逸出。开发了一种创新的二维分析模型，用于检测挥发性有机化合物（VOCs）通过由气体回收层、压实粘土衬垫层（CCL）层、土工膜（GMB）和保护层组成的四层土壤覆盖物的迁移。评价了源浓度分布、LFG收集系统、饱和度、污染物降解率和GMB对覆盖系统性能的影响。对于聚类更紧密的污染源浓度，基于非均匀污染源分布分析的一维模型往往比二维模型得出更保守的结果。结果表明，饱和度（Sr）和降解速率的增加导致稳态表面通量的降低。覆盖系统中VOCs的迁移对覆层和气采层Sr变化的敏感性高于保护层。二维结果表明，当Sr1 = Sr2 = Sr4 = 0.5时，将污染物半衰期降低到0.01年，可以改善覆盖系统的性能。覆盖系统要达到70%的LFG收集效率和满足表面通量容差值，需要完整的GMB层和6 m3/s以上的气体收集流量。该分析模型可用于填埋场覆盖系统的初步设计和复杂数值模型的验证。

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A Two‐Dimensional Analytical Model for Volatile Organic Compounds (VOCs) Transport in Layered Landfill Composite Cover System With Gas Collection System

Layered cover structures are widely used as landfill environmental barriers to reduce the escape of odor gases. An innovative two‐dimensional analytical model is developed to examine volatile organic compounds (VOCs) migration via a four‐layered soil cover made up of a gas recovery layer, compacted clay liner (CCL) layer, geomembrane (GMB), and protective layer. The effects of source concentration distribution, LFG collection system, saturation degree, contaminant degradation rate, and GMB on cover system performance were evaluated. For a significantly more tightly clustered source concentration, 1D models tend to produce more conservative results in contrast to the 2D models based on the analysis of nonuniform contamination source distribution. Results show that increasing saturation degree (Sr) and degradation rate lead to lower steady‐state surface flux. VOCs migration in the cover system is more sensitive to Sr variation in the CCL and gas recovery layer than that in the protective layer. The 2D results suggest that decreasing the half‐life of the contaminant to 0.01 years when Sr1 = Sr2 = Sr4 = 0.5 can improve the cover system performance. An intact GMB layer and the gas collection flow rate of over 6 m3/s are required for the cover system to achieve a 70% LFG collection efficiency and satisfy the surface flux tolerance value. The proposed analytical model can be used for the preliminary design of the landfill cover system and verification of the complex numerical model.

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.