Posts tagged “treatment plants

Fighting fatbergs is a dirty (but avoidable) job

By Jennifer Nations, Water Resource Coordinator

Remember the iconic line from the movie “Titanic”?

“Fatberg, right ahead!”

Wait, what?

Sorry, the movie line was actually about an iceberg. But fatbergs are real, and they can put a fat hole in a utility’s maintenance and operations budget.

Fats, oils, and grease (FOG) – along with flushable and non-flushable rags and wipes – merge in our sewers to form solid, immovable blockages known as fatbergs. They are worse in the winter months when cooler temperatures make it easier for the FOG to solidify.

Recently in London, it took nine weeks to dislodge a fatberg measuring 800 feet long and weighing 130 tons. That’s the same as 10 London double-decker buses.

The unsightly blobs can also significantly impact water quality and the environment after sewer overflows. We traced a recent sewer overflow to grease and paper towels coming from a fast food restaurant, which had to close for five hours while we made repairs.

Who drew the short straw?

While College Station hasn’t had fatbergs that colossal, we aren’t immune to problems caused by FOG and wipes. When a big grease blob sticks to the ultraviolet light used to disinfect our wastewater, the light can’t do its job.

When that happens, Courageous operators must manually remove disgusting balls of grease, wads of wipes, paper towels – even underwear – to keep expensive equipment from being damaged.

I’m not sure, but our brave operators probably draw straws to see who handles that dirty job!

Fatbergs can be costly

FOG and trash in the sewer system can also lead to increases in your wastewater rate. For the Lick Creek Wastewater Treatment Plant expansion, a $150,000 preliminary screening station was added to the design to remove such things as wipes, rags, hygiene products of the cotton and plastic variety, and trash.

If you need to see it to believe it, the City of Spokane, Washington filmed an experiment with several commonly flushed items to find the answer to the question “will it flush?” Spoiler alert: only the toilet paper flushed.

Manually removing the grease at our wastewater plants costs the city an average of $600 a week.

3 ways to trim the fat

  1. Scrape food scraps into the garbage and let grease solidify in pans before placing it in the trash. Pour oil and grease into a can and after it hardens, put the sealed container in the regular trash.
  2. Avoid placing paper products – even those marked as flushable – down the drain or in the toilet. #NoWipesinPipes
  3. You can help protect your sewer system by remembering to only flush the 3 P’s – pee, poop, and toilet paper.

College Station Water Services – especially our valiant wastewater operators – appreciate your assistance in reducing our fatberg problem.

If you have any questions, email me at jnations@cstx.gov.

 


About the Blogger

Jennifer Nations has been the City of College Station’s water resource coordinator since 1999 after two years as BVSWMA’s environmental compliance officer. She’s also chair of the Water Conservation and Reuse Division for the Texas Section of the American Water Works Association. A native of Fremont, Calif., Jennifer earned a bachelor’s degree in environmental & resource science from UC-Davis in 1995 and a master’s degree in water management & hydrologic science from Texas A&M in 2016.


 

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