Effect of co-digestion of food waste and cow dung on biogas yield

Makhura Emmanuel Pax, Edison Muzenda, Tumeletso Lekgoba

Research output: Contribution to journalConference articlepeer-review


This paper aims at finding the effect of co-digestion of cow dung and food waste on total biogas yield. Biogas production was improved through co-digestion of cow dung and food waste (FW) containing a small fraction of inoculum under mesophilic temperature (37C) over a retention time of 24 days. Co-digestion ratios of 1:1, 2:1 and 3:1 for cowdung/foodwaste were used for the study on anaerobic digestion on the co digested matter. Tests were carried out starting with the preparation of substrates, substrate characterization to determine the moisture content (MC), total solids (TS), volatile solids (VS) and ultimately batch anaerobic digestion experiments under thermophilic conditions (370C). The moisture content, volatile solids and total solids for food waste were 78, 22 and 90.7% respectively while the characteristics for cow dung were 67.2, 32.8 and 96.0 % respectively. From the study, a mixing ratio of cow dung: food waste of 1:2 was found to be the optimum substrate mixture for biogas production at 25595.7 Nml. The accumulated gas volumes of 18756.6, 14042.5, 13940.8 and 13839.1 Nml were recorded for cow dung: food waste ratios of 2:1, 1:1, 1:3 and 3:1 respectively. For a co-digestion containing more of the food waste than cow dung, a higher volume of biogas is produce.

Original languageEnglish
Article number01005
Number of pages5
JournalE3S Web of Conferences
Publication statusPublished - Jul 24 2020
Event2020 5th International Conference on Sustainable and Renewable Energy Engineering, ICSREE 2020 - Paris, France
Duration: May 6 2020May 9 2020

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • General Energy
  • General Earth and Planetary Sciences


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