The effective area of the whole tipping area in operation was estimated to be 20,727 m2
. The
US-ISCST complex model was applied to predict the odour dispersion at the surrounding
area of the landfill site. In the meantime, 5-year weather records were obtained from the
nearest HK Observatory Station. Based on the odour measurement results and weather data,
the dispersion contour of odour concentration around the landfill area was calculated by a USISCST
complex dispersion model to predicate the worst case during a year. Based on the
80
results of modelling work, the odour contour maps with different time intervals are shown in
Fig. 1 and the odour pollution at the surrounding area was evaluated against the EPD criteria
of 5 ou/m3
.