The aim of this work was to use fish processing waste
(FW) as main substrate for anaerobic digestion. To enhance the biogas
production of FW, co-digestion was done with two other substrates: cow dung
(CD) and waste of market (MW). Batch test
was carried out in an 1 L glass digester in a temperature controlled chamber at 38°C. The following mixtures were carried out: FW with CD
respectively at different ratios 100:0% (A), 80:20%(B) and
60:40% (C); FW with MW at the following ratio 80:20% (D); FW with CD and MW
respectively at these ratios 80:10:10% (F) and 60:20:20% (G). The biogas
produced was measured using a milligas counter® and the volume of gas was
recorded. The gas composition was determined using gas chromatography. With a
pH stable for raw substrates and mixtures, TS and VS (%TS) contents for FW were
respectively 31.01% and 91.55%. Between 3 to 13 days of experimentation, the
highest flow rate was observed. The percentage of methane was more important
for mixtures B and D, 61% and 59% respectively. pH and VOA/TIC were stable at the end of the batch test for all
mixtures, meaning that the organic matter was already well digested. The
highest values of Volatile Solid Removal
(VSR) were found for mixtures C, D, F and G. Therefore, the promising mixtures for next experimentations in large scale are B and D.
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