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flag Black debris balls on Sydney beaches likely came from the Malabar wastewater plant due to grease buildup and rainfall.

flag A year after mysterious black debris balls washed up on Sydney beaches, authorities have identified the Malabar wastewater treatment plant as the most likely source. flag Investigation by the NSW Environmental Protection Authority and University of Sydney expert Professor Stuart Khan found the fatbergs—formed from congealed fats, oils, grease, and debris—likely re-formed in the plant’s four-kilometer deep ocean outfall tunnel after primary treatment. flag Industrial runoff from western Sydney, where Malabar serves a larger industrial catchment than other plants, contributed hydrocarbons found in the balls. flag Heavy rainfall may have dislodged accumulated grease, which then rolled into spherical masses in ocean currents. flag While the exact origin within the Malabar system remains under study, Sydney Water is implementing programs to reduce fats, oils, and grease entering the system and planning major upgrades to Malabar and other facilities by 2031. flag Recycled water projects aim to reduce ocean discharge, though purified water is not yet approved for drinking.

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