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Landfill Gas Utilization

At present, all the three existing strategic landfills (namely West New Territories Landfill, South East New Territories Landfill and North East New Territories) have been utilizing landfill gas for energy production. The current uses include:

  • to generate electricity for use in on-site infrastructures, such as offices, maintenance workshop, pumping stations; and
  • to power the leachate (wastewater from landfill) treatment facilities.

For North East New Territories Landfill, the surplus landfill gas is also treated and delivered to Hong Kong & China Gas's (HKCG) production plant in Tai Po for use as alternative energy source. For South East New Territories Landfill, the surplus gas will be treated (in the form of synthetic natural gas) and conveyed to HKCG's Offtake Station at Tseng Lan Shue, where the treated gas will be blended with town gas for injection to the supply grid for HKCG's customers.

Apart from the strategic landfills, there are 13 closed landfills. We have now constructed restoration facilities on all the 13 closed landfills. We have used landfill gas as an energy source in some of the larger closed landfills. They are Shuen Wan, Gin Drinkers Bay, Jordan Valley, Tseung Kwan O Stage I , II and III and Pillar Point Valley landfills.

For Shuen Wan Landfill, special arrangement has been made with the Hong Kong & China Gas for piping the landfill gas to their plant for utilization. Landfill gas is also used as fuel in electricity generation to meet on-site uses in Jordan Valley and Tseung Kwan O Stage I landfills. Whereas for Gin Drinkers Bay, Tseung Kwan O Stage II/III and Pillar Point Valley, the landfill gas is used as a thermal energy source in the treatment of landfill leachate.

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Landfill Gas Utilization at Shuen Wan Landfill As Fuel for Towngas Production

Government, Contractor, Industry Work Hand in Hand

To produce a greener environment, Environmental Protection Department, Hong Kong and China Gas Co. and the Shuen Wan Landfill restoration contractor (Hong Kong Landfill Restoration Group) worked together to utilize the landfill gas extracted from the Shuen Wan Landfill as fuel at Hong Kong & China Gas's product plant in Tai Po.

Gas Linked

Invested over $10 million, the landfill gas utilization plant sited at Shuen Wan Landfill was linked up with the Hong Kong & China Gas's product plant in Tai Po by 1.3 kilometers of pipelines. The works were carried out from February to July 1999.

Environmental Benefits

The Shuen Wan Landfill currently delivers landfill gas at about 247 m3 per hour as a heating fuel substitute for the Hong Kong & China Gas's product plant in Tai Po. The project also reduces the emission of some 2,121 tonnes of carbon dioxide every year.

Image of Landfill Gas Utilization Plant at Shuen Wan Landfill
Landfill Gas Utilization Plant at Shuen Wan Landfill

Landfill Gas Utilization for Leachate Treatment at Gin Drinkers Bay Landfill, Tseung Kwan O Stage II/III Landfill and Pillar Point Valley Landfill

In order to control the potential risk of landfill gas migration to the surrounding areas, EPD has installed an active gas extraction system at the landfills. The collected landfill gas is utilised as an energy source for the treatment of leachate (wastewater generated due to degradation of waste at the landfill) at the on-site Leachate Treatment Plant.

This utilisation of landfill gas not only avoids the release of untreated landfill gases into the atmosphere, it also demonstrates the beneficial reuse of energy from waste in an environmental friendly manner.

Image of Gin Drinkers Bay Leachate Treatment Plant where landfill gas is collected and utilised for heating up leachate in the ammonia removal process for the treatment of leachate.
Gin Drinkers Bay Leachate Treatment Plant where landfill gas is collected and utilised for heating up leachate in the ammonia removal process.

Landfill Gas Utilization for Road Lighting System at Tseung Kwan O Stage I Landfill

Road Lighting System at Tseung Kwan O Stage I Landfill Photo As a betterment project to Tseung Kwan O, EPD completed the installation of a lighting system along the access road between Wan Po Road Pet Garden and seafront cycle track at Tseung Kwan O Stage I Landfill in 2014.  The lighting system is the first public utility in Hong Kong powered by the electricity derived from landfill gas.  A total of 20 lamps each of 150W provide an average luminance of 5 lux along the road.  The utilization of landfill gas in this case actualizes the principle of Waste-to-Energy and benefits the community.

 

Landfill Gas to Energy at Closed Landfills

Closed Landfills Quantity of Gas Collected (cubic meter per hour) Modes of Landfill Gas Utilization Quantity of Gas Utilized (cubic meter per hour)
Shuen Wan 247 Gas treated and piped to Towngas for use as fuel 247
Tseung Kwan O 1,391 Electricity generation for on-site use; used for heating in the leachate treatment process 903
Gin Drinkers Bay 183 Used for heating in the leachate treatment process 183
Pillar Point Valley 445 Used for heating in the leachate treatment process 444
Jordan Valley 88 Electricity generation for on-site use 4

 

Landfill Gas to Energy at Strategic Landfills

Strategic Landfills Modes of Landfill Gas Utilization Quantity of Gas Utilized (cubic meter per hour)
WENT Electricity generation for on-site use and leachate treatment 2,917
SENT Electricity generation for on-site use and leachate treatment 3,249
NENT Electricity generation for on-site use and leachate treatment, off-site town gas production 6,415

 

Notes: (1) The above figures are average figures in 2014.
     

 

 

 

 

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