3.5. Agitation speed
To investigate the effect of agitation speed on percentage
COD and BOD reduction with MAC and CAC, the agitation
speed was kept between 100 rpm and 800 rpm. Fig. 6
showed that there was a very slow trend for the percentage
COD and BOD reduction with the agitation speed for
CAC and MAC. Maximum COD and BOD reduction
was observed around 600 rpm for both the adsorbents.
But at higher agitation speeds, the loosely attached molecules
might re-enter into the adsorbate, lowering the percentage
COD and percentage BOD reduction. Therefore
we kept the agitation speed at 600 rpm to see the effect of