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Anaerobic co-digestion of water hyacinth and banana peels with and without thermal pretreatment

Barua, Visva Bharati, Rathore, Vidhi, Kalamdhad, Ajay S.
Renewable energy 2019 v.134 pp. 103-112
Eichhornia crassipes, air, anaerobic digestion, banana peels, biogas, cow manure, gas production (biological), inoculum, methane, mixing, mixing ratio, ovens, synergism
This study evaluates the effect of mixing ratio (1, 1.5, 2 and 2.5) and hot air oven pretreatment on the anaerobic co-digestion of water hyacinth and banana peels. Two sets of bio-chemical methane potential (BMP) tests were performed concurrently. In set I, untreated water hyacinth was mixed with banana peels and in set II, water hyacinth was pretreated before co-digestion. Fixed amount of cow dung was added to each reactor as an inoculum. The anaerobic batch test revealed that set II, where pretreated water hyacinth and banana peels was co-digested, demonstrated higher biogas production and better quality of biogas than set I. Mixing ratio 2 and 1.5 were illustrated to be the optimal mixing ratio for set I and II respectively. Both the sets illustrated higher biogas generation than mono-digestion of the substrates. Thus, anaerobic co-digestion of water hyacinth and banana peels portrayed a synergistic action by balancing the overall process.