Nereda design capacity

  • 1000 m3/d
    Dry Weather Flow
  • 450 m3/h 
    Peak Flow
  • 4630 PE
    PE (PE = 60 gBOD/d)

Project facts

  • Location
    Sha Tin, Hong Kong
  • Period
    2016
  • Wastewater
    Pilot Plant

About the Hong Kong Nereda® Pilot WWTP

Nereda technology is one of the advanced sewage treatment technologies that is being explored for the relocation of Hong Kong’s largest secondary sewage treatment works - Sha Tin - to caverns. This would release the existing site of about 28 hectares for housing and other purposes that would enhance our living quality. It is an innovative approach in line with Hong Kong's long-term social and economic development. 

aerial overview photo of the Sha Tin WWTP

To support Hong Kong’s sustainable development, the Government is actively exploring various approaches to develop new land resources. One of those approaches includes the relocation of the Sha Tin Sewage Treatment Works (with a capacity of around 350,000 MLD) to caverns, with a view to releasing the existing site (approximately 28 hectares) for other beneficial uses. Several advanced process technologies are being considered in order to optimize the benefits of the project and in October 2015 the Drainage Services Department signed a contract with a local Contractor, Kingsford Environmental Limited, for carrying out pilot tests for sewage and sludge treatment processes under local conditions. Key objective of this Contract is to obtain information on the treatment performance, limitations, design characteristics and operation & maintenance requirements of pre-selected secondary treatment processes including Nereda technology.

Challenge

To support Hong Kong’s sustainable development, the Government is actively exploring various approaches to develop new land resources. One of those approaches includes the relocation of Hong Kong’s largest secondary sewage treatment works (capacity of around 350 MLD) - Sha Tin - to caverns. This would release the existing site of about 28 hectares for housing and other purposes that would enhance our living quality. It is an innovative approach in line with Hong Kong's long-term social and economic development.

Solution

Nereda was selected as one of the most attractive candidate technologies for the relocation and in 2015 the Drainage Services Department signed a contract with a local Contractor, Kingsford Environmental Limited, for carrying out pilot tests with selected technologies at a scale of 1 MLD. The key objective of this Contract is to obtain information on the treatment performance, limitations, design characteristics and operation & maintenance requirements of pre-selected secondary treatment processes including Nereda technology.

Nereda was selected as one of the most attractive candidate technologies for the relocation and in 2015 the Drainage Services Department signed a contract with a local Contractor, Kingsford Environmental Limited, for carrying out pilot tests with selected technologies at a scale of 1 MLD. The key objective of this Contract is to obtain information on the treatment performance, limitations, design characteristics and operation & maintenance requirements of pre-selected secondary treatment processes including Nereda technology.

Outcome

The multi-year pilot operation validated that Nereda is a suitable technology to be applied to the specific Hong Kong conditions. The operation showed that Nereda easily fulfilled the treatment objectives – also the more stringent requirement applicable to Effluent Polishing Plants – and was resilient against the large salinity fluctuations resulting from Hong Kong’s seawater toilet flushing. Following this positive assessment, the technology was together with MBBR one of the allowed options for the iconic Yuen Long Effluent Polishing Plant project and the outcome of the tender phase demonstrated the cost and sustainability advantages of the selected Nereda solution.