Fenton-Based Treatment of Meat and Bone Meal Wastewater: Influence of Variable Fe2+/H2O2 Ratios on Microbiological Abundance and Community Composition
2025
Agnieszka Makara | Zygmunt Kowalski | Weronika Suchoń | Agnieszka Generowicz | Iwona Wiewiórska
Processing of meat waste into meat and bone meal generates wastewater that must be properly treated to minimize its environmental impact. In addition to its high organic load, it contains microorganisms, including pathogens, that pose a threat to human health. In this study, wastewater from meat and bone meal production was treated using the Fenton process with a variable Fe2⁺:/H2O2 mass ratio ranging from 1:2 to 1:10, followed by neutralization with lime milk. A microbiological analysis was performed on both the raw wastewater and the liquid fractions obtained after treatment, along with additional analyses of selected physicochemical parameters. The identification of isolated microorganisms was carried out using the MALDI-TOF MS technique. Qualitative analysis of the treated wastewater samples showed the presence of microorganisms belonging to the genera Staphylococcus, Enterococcus, Alcaligenes, and Pseudomonas. Staphylococcus aureus and Alcaligenes faecalis were present in each of the treated samples. The Fenton process effectively reduced the total number of microorganisms, with the lowest counts of 1.3 ×: 102 CFU/mL and 3.2 ×: 102 CFU/mL found in wastewater samples treated with Fe2⁺:/H2O2 mass ratios of 1:8 and 1:10, which correlated with higher doses of hydrogen peroxide.
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