<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">settling tanks</topic></authority><related type="other"><topic>settling basins</topic></related><related type="broader"><topic>sewage treatment plants</topic></related><variant type="other"><topic>sedimentation tanks</topic></variant><variant type="other"><topic>settling tank</topic></variant><variant type="other"><topic>tanks, settling</topic></variant> <note xml:lang="en"><![CDATA[ Components of modern sewage-treatment systems where waste water is passed through a series of tanks following coarse screening to remove large objects. Grit chambers settle out sand and cinders; primary settling tanks remove heavy organic solids; and aeration tanks mix the incoming sewage with activated, bacteria-rich sludge and fine air bubbles, causing the rapid oxidation of organic matter. Final settling tanks remove the remaining suspended solids from the mixture. ]]></note></mads>