Influence of trace elements on biogas production from mango processing waste in 1.5 m3 KVIC digesters.

The inf luence of t race elements (Co2+ , Ni 2+ and Fe 3+~ in v a r y -
ing concentrations and combination, was studied in 1.5 m Khadi &
Village Industries Commission (KVIC) digesters for biogas generation
from mangopeel. Addition of these trace metals enhanced the biogas
yield and methane content moderately, the maximum being with the
iron fed digester. The digesters were always found to be stable without
much variation in total volatile fatty acids (VFA), pH, total alkal
i n i t y and other parameters. A methane content of 62~0 and biogas
yield of 0.49 m 3 /kg VS added was obtained with 4000 mg/L FeCI 3
supplemented mangopeel fed digester as compared to control having
biogas yield of 0.22 m3/kg VS added with a methane content of about
48-50%.