Use of CFD for static sampling hood design: An example for methane flux assessment on landfill surfaces. (November 2016)

• Record Type: Journal Article
• Authors: Lucernoni, Federico; Rizzotto, Matteo; Tapparo, Federica; Capelli, Laura; Sironi, Selena; Busini, Valentina
• Is Part Of: Chemosphere. Volume 163(2016)
• Page Start: 259
• Page End: 269
• Publication Date: 2016-11
• Subjects: Landfill gas -- Emissions assessment -- Computational fluid dynamics -- Passive area sources -- Static hood -- Flux chamber; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2016.07.092
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The work focuses on the principles for the design of a specific static hood and on the definition of an optimal sampling procedure for the assessment of landfill gas (LFG) surface emissions. This is carried out by means of computational fluid dynamics (CFD) simulations to investigate the fluid dynamics conditions of the hood. The study proves that understanding the fluid dynamic conditions is fundamental in order to understand the sampling results and correctly interpret the measured concentration values by relating them to a suitable LFG emission model, and therefore to estimate emission rates. For this reason, CFD is a useful tool for the design and evaluation of sampling systems, among others, to verify the fundamental hypotheses on which the mass balance for the sampling hood is defined. The procedure here discussed, which is specific for the case of the investigated landfill, can be generalized to be applied also to different scenarios, where hood sampling is involved. Highlights: Emissions from landfill surfaces are a problem and CFD simulations can be helpful. Landfill surface emissions assessment requires specific devices. The paper highlights some operational aspects of Static Hoods. Five simulations were performed, providing hints on possible design improvements. One main outcome is that the sampling point must be chosen carefully.