Upgrading of San Wai Sewage Treatment Works - Phase 1

  • San Wai Sewage Treatment Works - Phase 1

  • Administration Building & Maintenance Workshop

  • Administration Building & Maintenance Workshop

  • Administration Building & Maintenance Workshop

  • Administration Building & Maintenance Workshop


New Buildings V1.2
Final Platinum

Overall Score
Site Aspects
Materials Aspects
Energy Use
Water Use
Indoor Enviro. Quality
Credit(s)    Innovations and Additions

This project is to design, construct and operate the San Wai Sewage Treatment Works Phase 1 (SWSTW) to replace the pre-existing San Wai Preliminary Treatment Works at Ha Tsuen Road, Yuen Long.  The project commenced in May 2016, with an objective to improve effluent quality and handle increased sewage flow to cope with the increasing demand for sewage treatment in the North West New Territories. Having a capacity of 200,000 m3 per day, the SWSTW provides an efficient, reliable and robust system of chemically enhanced primary treatment (CEPT) and disinfection. It has been commissioned since 2020/2021. Its Administration Building cum Workshop (AB & WS) has attained the BEAM Plus Final Platinum accreditation.


Green Features

Site Aspects

  • Proactive approach to achieve greater integration of site planning and design issues in accordance with Urban Design Guidelines
  • Good landscape design that (i) has more than 40% soft landscape coverage, (ii) careful selection of native and adaptive species and (iii) contribute positively to the ecological value of the site
  • Use of pervious materials for a minimum of 50% of hard landscape area to reduce surface runoff 

Materials Aspects

  • Use sustainable forest products that account for at least 50% of all timber materials / products
  • Use regional materials that were extracted and manufactured within 800km from the site which account for at least 20% of all building materials / products

Energy Use

  • Use of energy efficient air-conditioning units that has coefficient of performance (COP) higher than that in Building Energy Codes 2015
  • Optimized lighting design with the use of LED or high efficient T5 fluorescent lamp that can reduce over 30% lighting power density as compared to BEC 2015
  • Generation of on-site renewable energy contributing at least 2.5% of total energy consumption
  • Adoption of energy sub-metering for monitoring and analysis of energy use

Indoor Environmental Quality

  • Fresh air provision in common areas and increased ventilation in normally occupied areas
  • Optimized window area and use of flat roof skylight to improve penetration of natural lighting
  • Adoption of acoustic design in rooms such as office and laboratory where speech intelligibility is important

Water Use

  • Use of water-efficient sanitary fitment, such as urinal, water closet, water faucet, pantry tap, etc.

Innovations and Additions

  • Provision twin water tanks for potable and flushing water system
  • IAQ Excellent Class


Project Details

Completion Year 2021
Number of Blocks 1
Number of Storeys 2
Type Government, Institutional and Community

Project Team

Project Owner or Developer Drainage Services Department, HKSAR Government
Architect Ove Arup & Partners Hong Kong Ltd.
Landscape Architect Ove Arup & Partners Hong Kong Limited
C&S Engineer Ove Arup & Partners Hong Kong Limited
Main Contractor ATAL-Degremont-China Harbour Joint Venture
Supervising Officer AECOM Asia Company Limited
Sustainable Design Consultant Cundall Hong Kong Limited
M&E Consultant ATAL-Degremont-China Harbour Joint Venture
Facility Manager ATAL-Degremont-China Harbour Joint Venture
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