Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Sci Total Environ. 2015 Mar 1;508:307-19. doi: 10.1016/j.scitotenv.2014.11.037. Epub 2014 Dec 6.
Methane oxidation in landfill covers is a complex process involving water, gas and heat transfer as well as microbial oxidation. The coupled phenomena of microbial oxidation, water, gas, and heat transfer are not fully understood. In this study, a new model is developed that incorporates water-gas-heat coupled reactive transport in unsaturated soil with methane oxidation. Effects of microbial oxidation-generated water and heat are included. The model is calibrated using published data from a laboratory soil column test. Moreover, a series of parametric studies are carried out to investigate the influence of microbial oxidation-generated water and heat, initial water content on methane oxidation efficiency. Computed and measured results of gas concentration and methane oxidation rate are consistent. It is found that the coupling effects between water-gas-heat transfer and methane oxidation are significant. Ignoring microbial oxidation-generated water and heat can result in a significant difference in methane oxidation efficiency by 100%.
垃圾填埋场覆盖层中的甲烷氧化是一个复杂的过程，涉及水、气和热传递以及微生物氧化。微生物氧化、水、气和热传递的耦合现象尚未完全了解。在这项研究中，开发了一种新模型，该模型将不饱和土壤中的水-气-热耦合反应输运与甲烷氧化结合在一起。包含微生物氧化产生的水和热的影响。该模型使用实验室土壤柱测试中发表的数据进行了校准。此外，进行了一系列参数研究，以研究微生物氧化产生的水和热、初始含水量对甲烷氧化效率的影响。计算出的和测量出的气体浓度和甲烷氧化速率结果一致。结果发现，水-气-热传递和甲烷氧化之间的耦合效应对甲烷氧化效率有显著影响。忽略微生物氧化产生的水和热会导致甲烷氧化效率产生 100%的显著差异。
