3. Primary treatment. The wastewater still contains organic solid matter-or human waste. The next stage is to seperate this from the water, and to do this, we put the wastewater into large settlement tanks, which causes the solids to sink to the bottom of the tank. We call these settled solids âsludgeâ.
Between 2004 and 2014, the share of STEM-related bachelor's degrees earned by women decreased in all seven discipline areas: engineering; computer science; earth, atmospheric and ocean sciences; physical sciences; mathematics; biological and agricultural sciences; and social sciences and psychology.
Stem(noun) the stock of a family; a race or generation of progenitors. Stem(noun) a branch of a family. Stem(noun) a curved piece of timber to which the two sides of a ship are united at the fore end. The lower end of it is scarfed to the keel, and the bowsprit rests upon its upper end.