Water and Wastewater Terms Beginning S

A B C D E F G H I J K L M N O P Q R S T U V W Y Z

selector

A reactor or basin in which baffles or other devices create a series of compartments. The environment and the resulting microbial population within each compartment can be controlled to some extent by the operator. The environmental conditions (food, lack of dissolved oxygen) that develop are intended to favor the growth of certain organisms over others. The conditions thereby select certain organisms.