From kitchen waste to sky-high costs: inside Hong Kong’s quest for green jet fuel

South China Morning Post - Oct 9, 2026

China’s once-notorious “gutter oil”, recycled from kitchen and drainage waste, has almost vanished from dining tables in recent years and now carries the nickname liquid gold. The substance has become a highly sought-after feedstock for producing clean energy, especially sustainable aviation fuel (SAF), with biofuel producers such as Hong Kong-based Ecoceres sourcing gutter oil across the Greater Bay Area. EcoCeres’ co-chairman, Alan Chan Ying-lung, witnessed how the restaurant waste transformed...

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