فهرست نشریات علمی دسترسی آزاد ایران

This study focused on biogas production from date pits and kitchen waste in batch digesters under mesophilic conditions (37°C). The effect of the inoculum source (cow manure and sewage sludge) was examined, as well as different inoculum to substrate ratios (1/3, 2/3, 1/2). The impact of substrate dilution rates (0%, 50%, and 70%) on the anaerobic digestion of kitchen waste combined with sludge was also evaluated. The results showed that combining sewage sludge and kitchen waste in anaerobic digestion produced better outcomes compared with cow manure inoculum. Both I/S ratios, 1/3 and 1/2, were highly effective in the digestion of these wastes. A dilution rate of 70% combined with an I/S ratio of 1/3 produced the best results in terms of biogas and methane, yielding 1425 mL of biogas and 940 mL of methane per 3 g of total volatile solids (TVS), corresponding to 65.9% methane. Similarly, a 50% dilution with an I/S ratio of 1/2 produced favourable results, yielding 1401 mL of biogas and 854 mL of methane per 3 g of TVS, or 60.9%. These findings highlight the importance of optimising the I/S ratio and dilution rate to maximise biogas production from organic waste under mesophilic conditions. Finally, the reaction media were characterised before and after digestion to better understand the anaerobic digestion process.