MATERIALS AND METHODS
A laboratory-scale reactor was used to determine the
percentage removal efficiency of BOD, COD, SS, and
kinetic coefficients. A completely mixed continuous
flow reactor without recycle was used in this study
(Fig. 1). The reactor was made of Perspex glass of
5 mm thickness. The wastewater to the reactor was
fed using an influent glass bottle. A peristaltic pump
was used to regulate the flow to achieve a particular
hydraulic retention time. The capacity of the aeration
tank was 25 l. Diffuser stones were used to supply
air and were placed at the bottom of the aeration tank
along the wall to maintain the dissolved oxygen (DO)
level of 2.7 mg/l, which is suitable for the aerobic
treatment
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. A final clarifier followed the aeration
tank with 2.4 l capacity. The depth of the aerator was
27.2 cm with a working volume of 25.45 l.