tertiary sewage treatment
tertiary sewage treatment[¦tər·shē‚er·ē ¦sü·ij ‚trēt·mənt]
A process for purification of wastewater in which nitrates and phosphates, as well as fine particles, are removed; the process follows removal of raw sludge and biological treatment. Also known as advanced sewage treatment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.