We had tried to obtain conditions for the maximum
COD and BOD reduction for both the adsorbents. The
optimum operating conditions for getting maximum
COD/BOD reduction from wastewater with MAC were
treatment time: 150 min, adsorbent dose: 35 g/l, pH 7, initial
COD/BOD concentration: 1080/505 mg/l, agitation
speed: 600 rpm and adsorbent particle size 6 0.053 mm
and with CAC these were treatment time: 180 min, adsorbent
dose: 40 g/l, pH 2, initial COD/BOD concentration:
1080/505 mg/l, agitation speed: 600 rpm and adsorbent particle
size 6 0.053 mm, as shown in Table 2. It could be
inferred from the experimental results presented in this
paper that concentrations of COD and BOD remaining
after treatment with mixed adsorbent carbon were comparable
with commercial activated carbon and were within
the permissible limits of CPCB standards as shown in Table
1. These results could be utilized for working out the design
parameters of an adsorption-based decentralized wastewater
treatment system. Moreover, if mixed adsorbent carbon
was added in secondary treatment tank for the effluent
treatment, there could be a good saving of energy, which
otherwise had been consumed in aeration process.