All the experiments were conducted in batches. In each
experimental run, a wastewater sample of 1.2 litres was
collected and placed in an electrolytic cell. The sample
was rigorously stirred by a stirrer. Iron electrodes were
dipped into the solution upto an active surface area of
72cm2 and the following currents of 0.12, 0.25 and 0.36
amp (0.36 amp-15V, 0.25) were passed for a contact time
of 5, 10, 15 and 20 minutes. After passing each current for
each time period (i.e., after each batch experiment), the
sample was transferred into another beaker, and measured
for pH. The measured sample was then taken to the jar
test equipment, where it was rapidly mixed for 1 minute
at 100 rpm. After a rapid mix for 1minute, the sample was
kept for flocculation by setting the speed of the paddles at
30 rpm for 20 minutes. Subsequently, the flocculated
sample was kept undisturbed for 20 minutes, in order to
allow the flocs that formed during the flocculation to
settle down. After a settling time of 20 minutes, 250 ml
supernatant sample was collected to perform the physical
and chemical analysis according to APHA standards.
Similar analysis was done with the influent raw municipal
wastewater samples before starting the experiment.