Characterization of the microbiological effects of pomegranate, banana, and mandarin peels on water under laboratory conditions.

The protection of natural resources, especially water resources, is attracting international attention by researchers in order to achieve sustainable development. Inadequate treatment of waste from the food industry leads to pollution of ground and surface water through leachate or direct discharge of waste. To understand the impact of inappropriate discharge of these wastes, the microbial groups (bacteria, yeasts, and moulds) of pomegranate peel (PP), banana peel (BP), mandarin peel (MP) and the water in which each waste is decomposed were studied. The microbial groups were isolated, quantified, and purified by elective media at 30 °C. The fungal microbial isolates were identified by their macro and microscopic characteristics. The findings show that the highest density of bacteria (3.95 ± 0.48 × 10 CFU/ml) was obtained in the water in which the BP is decomposed, the highest density of yeasts (4.59 ± 0.52 × 10 CFU/ml) and moulds (4.10 ± 0.34 × 10 CFU/ml) was recorded in the water in which the PP is decomposed compared to the microbial density of the initial and the final control water. The fungal microbial groups were more diverse between the decomposition waters; the waters in which PP and BP are decomposed showed a higher diversity with 9 and 8 species respectively, compared to the water in which MP is decomposed with 7 species, and compared to the initial and the final control water with 3 and 5 species respectively. Conclusively, direct dumping or landfilling of food waste in general, PP, BP, and MP in particular can cause pollution of surface and groundwater by microorganisms that can be harmful.