In order to reduce the land area required by aerobic pond,
Vijayaraghavan et al. (2007) proposed to use an activated sludge
reactor as post-treatment after an anaerobic digestion process. It
was found that the COD removal efficiency declined from 83 to 42%
and 57% to 27% at HRT of 36 h and 24 h, respectively, when the
influent concentrations increased from 1000 to 5000 mg/L. In
addition, the effluent failed to meet the discharge standard. Activatedtreatment systems, however is the least used by palm oil mills due
to its higher operation cost. An overview pertaining to the performance
of aerobic treatment of anaerobically digested POME is
summarized in Table 1.
sludge system appears to be one of the most effective aerobic treatment systems, however is the least used by palm oil mills due
to its higher operation cost. An overview pertaining to the performance
of aerobic treatment of anaerobically digested POME is
summarized in Table 1.