Anaerobic co-digestion of giant reed for biogas recovery

Abstract EN

This study investigated the feasibility of anaerobic co-digestion of giant reed (GR) inoculated with waste manure as a co-substrate for biogas production.

The performance of co-digestion was evaluated in 4 anaerobic digesters operated in batch mode at different conditions.

The effects of alkali pretreatment with NaOH (4% w/v) solution, inoculum type, and thermal condition were studied.

The results demonstrated that the alkali-pretreatment of GR enhanced the biogas generation by about 15% at mesophilic conditions.

Thermophilic conditions enhanced the biogas recovery from both alkali-free and alkali pretreated GR by 15% and 127%, respectively.

The kinetic study of the co-digestion process of GR for biogas recovery suggested a significant agreement between measured and predicted values obtained by Modified Gompertz Model with correlation coefficients ≥ 0.98 indicating favorable conditions for the co-digestion of inoculated GR.