Waste to Energy – Distributed Generation from Food Waste in Hong Kong

Anaerobic digestion of converting food waste to biogas is one of the most promising technologies to tackle the food waste disposal problem. It is also a good source of renewable energy which is to be promoted as part of the Hong Kong’s climate actions to meet the carbon intensity reduction target. However, it is a challenge for the Hong Kong Government to build a network of Organic Waste Treatment Facilities (OWTFs) to treat the food waste due to the difficulty to find suitable sites and the lengthy process to plan and construct these centralized facilities.

One possible solution is to develop innovative decentralized food waste recycling systems to serve clusters of food waste sources. But prerequisite for such decentralized systems would be a new food waste conversion process that is more robust, more compact and easier to operate than the conventional anaerobic digestion facilities. Besides, the end products recovered from the food waste need to have high market value in order to achieve financial viability to attract private sector’s participation. To this end, a novel 3-step zero effluent discharge process was developed and a 50 kg/day pilot system was built for testing. This presentation would report the results of the research work.