4-1 Reactors used for the Treatment of Wastewater Types ofReactors Fig. 4-2 Definition sketch for various types of reactors used for wastewater treatment he principal types of reactors used for the treatment of wastewater. are )the batch reactor, 2) the complete-mix reactor(also known as the continuous flow stirred-tank reactor (CFSTR) in the chemical engineering literature) 3)the plug-flow reactor (also known as a tubular-flow reactor (4)complete-mix reactors in series (5) the packed-bed reactor (6)the fluidized-bed reactor4-1 Reactors used for the Treatment of Wastewater Types of Reactors Fig. 4-2 Definition sketch for various types of reactors used for wastewater treatment The principal types of reactors used for the treatment of wastewater, are (1) the batch reactor, (2) the complete-mix reactor (also known as the continuous￾flow stirred-tank reactor (CFSTR) in the chemical engineering literature), (3) the plug-flow reactor (also known as a tubular-flow reactor), (4) complete-mix reactors in series, (5) the packed-bed reactor, (6) the fluidized-bed reactor