Complex sentence: In environmental engineering, residence time applies to water treatment and wastewater treatment in the amount of time that water is spends in a batch reactor, plug flow reactor, completely mixed flow reactor (CMFR), and/or flocculation tanks.
Split into simpler sentences: In environmental engineering, residence time applies to water treatment and wastewater treatment. It refers to the amount of time that water spends in a batch reactor, plug flow reactor, completely mixed flow reactor (CMFR), and/or flocculation tanks.