From the BBC:
Deep in a water treatment plant in Ramstein, near Kaiserslautern in south-west Germany, one woman believes she's found the answer [to fatbergs]. Dr Andrea Junker-Buchheit works for a start-up called Lipobak.
"We treat fatbergs with a special micro-organism solution. We grow bacteria which have been developed specifically to eat fat. They digest all the fat, all the grease, all the oil."
...
Work in this area started under a US patent nearly 30 years ago, but has come back to the fore since it expired.
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