From the Fig. 2 it is predicted that the suspended solids
removal will increases with the increase of operating time
and remained constant after 20minutes of observation.
With increase of current the removal efficiency of
suspended solids also increased. The Fig. 3 depicts the
relationship between the percent removals of total
dissolved solids and the current at various contact times.
Total dissolved solids concentration is found to be
decreasing with the increase in current and detention time
in the settled samples. This is due to the presence of
flocculent that is produced with increase in current and
detention time that contributes to high removal of
suspended solids. Up to 0.25 amp, total dissolved solids
are found to be continuously decreasing with detention
time. However at 0.36 amp, a sharp decrease in the
concentration of total suspended solids at a contact time
of 5 minutes is observed. A gradual increase observed
later. It is due to the re stabilization phenomenon that took
place because of excess coagulant dose that made
particles restabilize and brought back them in suspension.