COD removal of more than 80% by solids removal and
anaerobic degradation was also found by Annachhatre &
Amatya () with 95%, Rajesh Banu et al. () with
83–91%, Hien et al. () with 90% and Colin et al.
() with 87%. The respective organic loads were 16, 23,
40 and 12 kg COD/(m³ · d). However, all of the studies
cited are based on laboratory-scale investigations under
well-defined conditions. Only in one study were nutrients
included, giving removal efficiencies of 38% for total-N
and 20% for total-P (Rajesh Banu et al. ). The biogas
yields reported were lower than those determined in this
work