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Relocation of Sha Tin Sewage Treatment Works to Caverns

Compliance with relevant air quality standard requirement
To obtain more reliable wind data for odour impact assessment , we have engaged the City University of Hong Kong to conduct a wind tunnel test for analysing the wind speed and wind direction at the proposed relocation site (Nui Po Shan of A Kung Kok) and develop the wind rose for the site.

Based on the wind tunnel test data, the feasibility study consultant completed the odour impact simulation and preliminarily determined the most appropriate location for the ventilation shaft. The feasibility study consultant predicted that, through implementing appropriate odour control measures and siting the ventilation shaft at remote location on the hill, the air quality at the nearby estates/ villages (e.g. Chevalier Garden, Kam Tai Court, A Kung Kok Fishermen Village, Tai Shui Hang Village, Mui Tsz Lam Village, etc.) will be far below the requirement of 5 odour units (OU) as stated in the Environmental Impact Assessment Ordinance.

Nearby Estate /
Distance from Ventilation Shaft (about) Predicted Maximum
Odour Level (OU)
Horizontal Distance Vertical Distance from Rooftop
Chevalier Garden

Kam Tai Court

A Kung Kok
Fishermen Village

Tai Shui Hang Village

Mui Tsz Lam Village








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Predicted Maximum Odour Level of Estates and Villages Adjacent to Proposed Relocation Site
    Preliminarily Proposed Odour Control Measures
  1. Caverns as natural barriers for more effective odour control
  2. Covering up of odour sources
  3. Installation of deodourising units to clean up the collected foul air
  4. Discharging exhaust air at height to further enhance the
    dilution effect
  5. Adopting sludge carrying vehicles with enclosed containers

In the investigation and design stage, we will conduct the environmental impacts assessment, including odour impact assessment, and propose suitable mitigation measures to ensure the compliance with the relevant requirements.

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