Our ESG Services

It’s more important than ever for organisations to adopt environmental, social and corporate governance (ESG) commitments, and take action to deliver a better world. We’re here to partner with you at every stage, from concept to design and delivery.

Our Strategy

With ESG principles embedded into everything we do, the goal of our Sustainable Legacies strategy is straightforward: to ensure that the way we run our business, and the work we do in partnership with our clients, leaves a positive, lasting impact for communities and our planet.

Our work

Carbon and energy neutral sewage treatment

Practical use of resources and prudent measures help minimize adverse environmental and ecological impact.

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To cope with increasing demands from a growing population and meet stringent discharge requirements, the existing Yuen Long Sewage Treatment Works (YLSTW) in Hong Kong is currently undergoing a transformation into the Yuen Long Effluent Polishing Plant (YLEPP). When designing the upgrade, we worked with the client, the Drainage Services Department of the HKSAR Government to incorporate sustainable measures that maximize the use of renewable energy, minimize the impact on nearby ecological sites, and ultimately help YLEPP reach carbon and energy neutrality.

Recycling resources

Among the environment-friendly features of this project include the harvesting of biogas by-product from the treatment process to turn into electrical energy for its daily operations. The YLEPP is also the first wastewater treatment plant in the city to adopt the aerobic granular sludge (AGS) process for biological treatment, which not only is highly efficient, but also demands less energy due to reduced use of mechanical equipment such as mixers and recycle pumps.

Over 5,000 monocrystalline-type photovoltaic (PV) panels will be installed on most of the buildings of the YLEPP to generate solar energy, while the inclusion of skylights and solar pipes will bring in more natural lighting. Lastly, treated sewage effluent will be reused for cooling to lower energy and water demand.

Community engagement

Nearby the project are ecological sites that serve as important roosting areas and breeding grounds for migratory and wetland birds. To minimize disturbances, we halted construction using mechanical equipment within 100 meters from identified roosting areas after sunset, and built noise barriers and bird curtains. Besides its environment features, a part of the site will be transformed into a public co-use area to better connect the community. An education corridor will provide visitors with information about sewage treatment and renewable energy, while a roof garden with bird hide provides a relaxing open area for visitors to rest and enjoy.

Meeting demands

The upgrade to YLEPP is currently undergoing in stages. When completed, it will increase the facilities’ treatment capacity from 70,000 cubic meters per day at secondary treatment level to 150,000 cubic metres per day, all while keeping its current site at 8 hectares.