activated sludge process


Definition of activated sludge process

: a sewage treatment procedure in which the decomposition of the raw sewage is hastened by the addition to it of biologically active sewage sludge

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of activated sludge process

1916, in the meaning defined above

Keep scrolling for more

Learn More about activated sludge process

Time Traveler for activated sludge process

Time Traveler

The first known use of activated sludge process was in 1916

See more words from the same year

Statistics for activated sludge process

Cite this Entry

“Activated sludge process.” Dictionary, Merriam-Webster, Accessed 15 Jan. 2021.

Comments on activated sludge process

What made you want to look up activated sludge process? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Words of Snow and Ice Quiz

  • image1037863653
  • Which of the following refers to thin, bending ice, or to the act of running over such ice?
True or False

Test your knowledge - and maybe learn something along the way.


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!