In Hong Kong, landfill dumping has been a main approach for municipal solid wastes disposal
and will be continued in the near future. However, gaseous emission from municipal waste
may causes offensive odours and disturbs the neighbours around landfill sites. Usually there
are not enough buffer zones between landfill sites and the nearest sensitive receptors due to
a land restriction in Hong Kong. In this study, a comprehensive investigation about odour
pollution impact from a local landfill site was performed, in which a local landfill site was
selected as an odour emission source to study its odour pollution impact to the surrounding
areas and also identify its major characteristics. The investigation was conducted with three
approaches of olfactometry with a dispersion modelling, odour patrol monitoring, and
application of an e-nose technique. The odour pollution impact with reference to the criteria
proposed by the Hong Kong Government was assessed based on the results of grap
sampling and the previous 5 years weather data. A “Factor of Two” method is recommended
to assess the odour impact based on the olfactometry results. Electronic nose analysis
indicates that the odour in the boundary area of the landfill site has a similar nature to
municipal wastes including the waste sludge from conventional biological treatment
processes, municipal refuse from residential areas and construction wastes, but a different
nature to some chemical wastes including the sludge from a chemically enhanced
precipitation process, and some industrial wastes
In Hong Kong, landfill dumping has been a main approach for municipal solid wastes disposaland will be continued in the near future. However, gaseous emission from municipal wastemay causes offensive odours and disturbs the neighbours around landfill sites. Usually thereare not enough buffer zones between landfill sites and the nearest sensitive receptors due toa land restriction in Hong Kong. In this study, a comprehensive investigation about odourpollution impact from a local landfill site was performed, in which a local landfill site wasselected as an odour emission source to study its odour pollution impact to the surroundingareas and also identify its major characteristics. The investigation was conducted with threeapproaches of olfactometry with a dispersion modelling, odour patrol monitoring, andapplication of an e-nose technique. The odour pollution impact with reference to the criteriaproposed by the Hong Kong Government was assessed based on the results of grapsampling and the previous 5 years weather data. A “Factor of Two” method is recommendedto assess the odour impact based on the olfactometry results. Electronic nose analysisindicates that the odour in the boundary area of the landfill site has a similar nature tomunicipal wastes including the waste sludge from conventional biological treatmentprocesses, municipal refuse from residential areas and construction wastes, but a differentnature to some chemical wastes including the sludge from a chemically enhancedprecipitation process, and some industrial wastes
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