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Problems & Solutions

Organic Resources Recovery Centre (ORRC)
 

Objectives

 
The ORRC aims to recycle source-separated organic waste generated from the C&I sectors (mostly food waste) to useful products, thereby minimizing requirement for landfill disposal.
 

Kowloon Bay Pilot Composting Plant and Food Waste Recycling Partnership Scheme

 
As Hong Kong has little experience in collecting and treating food waste, a Pilot Composting Plant was developed at the Kowloon Bay Waste Recycling Centre in mid 2008 to acquire experience. A Food Waste Recycling Partnership Scheme with the trades and institutions and Food Waste Reduction Program were  also established in late 2009 and mid 2010 respectively to promote food waste reduction and source separation of unavoidable food waste for subsequent collection and treatment. The Pilot Plant and Partnership Scheme contribute to food waste management and ORRC development in Hong Kong.
 
Technology
 

The ORRC would adopt biological technologies - composting and anaerobic digestion (figure below) to stabilize the organic waste and turn it to useful compost products and biogas for energy recovery.

The incoming organic waste would first go through a pre-treatment process to remove inert materials. The pre-treated materials would then be fed into the digesters for anaerobic digestion.  During the anaerobic digestion process, biogas, which is rich in methane, would be generated. The biogas would be fed to on-site combined heat & power generators and be converted into electricity and heat. After digestion, the materials from the digesters would be pumped dewatering facility and further treated by composting. The wastewater generated in the process would be treated by on-site wastewater treatment units and be reused in the process. The compost products produced could be used for landscaping and agricultural uses.

Anaerobic Digestion

 

Benefit

 
The ORRC will be developed in two phases, where phase 1 would treat 200 tonnes of organic waste (mostly food waste) for the production of biogas and about 20 tonnes of compost every day. The biogas produced by the ORRC could be used as renewable energy. It is estimated that for the first phase of ORRC, about 14 million kWh of surplus electricity can be supplied to the power grid per year, which is adequate for use by 3,000 households. This renewable energy production will contribute to reduction of 25,000 tonnes per year of greenhouse gas emission via reduction in use of fossil fuel for electricity generation.
 
 

The two phases of facilities developed will have a total daily treatment capacity of 500 tonnes of organic waste. Each phase of the ORRC would avoid landfilling of about 200 and 300 tonnes of waste every day respectively, hence contribute to extending the useful life of landfills in Hong Kong.

 
Projects 
 
A site search to locate suitable sites for the ORRC was completed. The proposed sites for the first phase and second phase of the ORRC are located at Siu Ho Wan of North Lantau and Shaling at North District respectively.  

ORRC location map

The EIA study for developing the first phase of the ORRC at Siu Ho Wan has examined the potential impact of the Project on the environment and the need for mitigation solutions. The Report determined that with the implementation of the mitigation measures proposed by the Project, no unacceptable residual impact is envisaged. The EIA Report was approved by the Director of Environmental Protection on 24 February 2010. The design and construction is commenced in December 2014 and it is expected that the plant will be commissioned in 2017.

The Feasibility Study and EIA for the second phase of the ORRC at Shaling were commenced in late 2011.

Artist View of the OWTF

Artist's Impression of the Organic Resources Recovery Centre

 
 
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User review date: 
Monday, 31 July, 2017