13 Dec Investigation & rehabilitation of Tseung Kwan O landfill, New Territories, Hong, Kong
HONG KONG ENVIRONMENTAL PROTECTION DEPARTMENT/
SCOTT WILSON KIRKPATRICK
Investigation & Rehabilitation of Tseung Kwan O Landfill, New Territories
THIS IS AN HISTORICAL PROJECT PROFILE
An investigation of the hydrogeology of the existing TKO landfill was
undertaken on behalf of the Hong Kong Environmental Poretctin Department (EPD).
The landfill was formed within a seawater embayment created by the
deposition of rock and clay, which was then dewatered. Landfill then
created a new raised platform approximately twenty metres above
sea level, which was capped with clay & inert wastes.
Monitoring piezometers were constructed through the wastes and
perimeter embankments to determine the saturated thickness of leachate
and flow directions. Small-scale pumping tests were undertaken to
determine waste permeability. The flow of leachate and effect of tidal
variations were assessed for possible leachate recovery.
The geotechnical properties of the wastes were determined through
in-situ testing with regard to proposed further ‘piggy-back’ landfill
Samples of waste were analysed to determine their potential to generate
landfill gases (LFG). An LFG pumping trial was conducted to determine the
potential for extraction & utilisation. LFG extraction wells were
constructed throughout the wastes.
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