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Highlights

Water hyacinth and banana peels were co-digested with various mixing ratios.

Effect of thermal pretreatment on co-digestion was investigated.

Co-digestion alongwith pretreatment enhanced biogas generation.

Gompertz equation simulation validated the experimental observation.

Abstract

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.

Keywords

Water hyacinth

Banana peels

Co-digestion

Mixing ratio

Pretreatment

Biogas

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