Municipal solid waste (MSW) is biodegradable in landfills under anaerobic conditions. The evolution of the hydro-biochemical-mechanical (HBM) processes during degradation is investigated first through experiments and subsequently through modelling. Three well-characterised MSW specimens from US landfill sites with significantly different waste compositions ranging from ‘waste-rich’ to ‘soil-rich’ were degraded in large-scale experimental set-ups that enabled simultaneous characterisation of the processes with time. The closely monitored processes are subsequently modelled using a two-stage anaerobic degradation model which is incorporated in the HBM model. This allows an assessment of model performance as a function of waste composition and derivation of waste-composition-dependent model parameters. The model performed fairly well in capturing the biochemical and physical behaviours. An increase in biodegradable material in waste specimen corresponds to an increase in anaerobic activity (volatile fatty acids and methanogenic biomass accumulation), a higher rate of organic fraction depletion, an increase in settlement and an increase in methane production. However, the model is found to significantly overpredict methane production for all the specimens.

中文翻译：

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基于降解实验的与废物成分相关的“ HBM”模型参数

在厌氧条件下，城市固体废物（MSW）可在垃圾填埋场中进行生物降解。首先通过实验研究，然后通过建模研究水-生化-机械（HBM）过程在降解过程中的演变。在大规模的实验装置中，降解了来自美国垃圾填埋场的三个具有很好特征的垃圾样品，其废弃物组成从“富含废物”到“富含土壤”有显着不同，从而可以随时间对过程进行同时表征。随后使用包含在HBM模型中的两阶段厌氧降解模型对受到密切监控的过程进行建模。这样可以评估模型性能与废物成分的关系，并推导依赖废物成分的模型参数。该模型在捕获生物化学和物理行为方面表现相当出色。废物样品中可生物降解材料的增加对应于厌氧活性（挥发性脂肪酸和产甲烷生物质的积累）的增加，有机组分耗竭率的提高，沉降的增加和甲烷产量的增加。但是，发现该模型显着高估了所有标本的甲烷生成量。