Fatbergs – enormous solid masses of oil, grease, wet wipes and other hygiene products that congeal together to cause major blockages – are wreaking havoc on the sewers of cities around the world. A 130 tonne specimen described as a “monster” recently caused backups in sewers in London’s Whitechapel, and the cities of Baltimore, Singapore and Dannevirke, New Zealand have also all experienced similar issues in recent weeks.
Fatbergs are not a recent phenomenon, but have attracted increased attention in recent years as old sewerage systems struggle to cope with an increased consumption and disposal of everyday products like fats, oils and greases from cooking. This is a particular issue for cities like London with Victorian systems. The visceral disgust that runs alongside the image of fatbergs lingering under the city, and the potential impact they will have on local flooding, means that they will remain a topic that demands attention.
Strategies are already being put in place in order to prevent sewer fatbergs. Current water industry tactics tend to focus on removing sewer blockages and reducing the fats, oils and greases that enter sewers from commercial sources (such as restaurants). But around three quarters of the fats, oils and greases in sewers comes from domestic sources, making household disposal a key priority for change.