Utilizing Industrial Waste for the Microbiological Decontamination of Sewage Sludge
Résumé
Sewage sludge (SS) disposal methods are increasingly used in sustainable applications, such as land reclamation for forestry and agriculture, which are recognized as effective strategies for nutrient recovery from the sludge. However, SS typically contains high levels of pathogenic microorganisms and chemical pollutants, necessitating appropriate treatment before reuse. Alkaline treatment is widely employed to reduce pathogenic content and improve the safety of SS for agricultural applications. In this context, the present study investigates the valorization of Filter Cake (FC), a byproduct of brown sugar refining primarily composed of calcium oxide (CaO), as a chemical conditioning aid in the dehydration and sanitization of digested SS. The objective was to explore the feasibility of converting digested SS and FC into value-added products in alignment with circular economy principles. The effect of FC as a drying adjuvant and disinfecting agent was evaluated by adding it to dehydrated SS at proportions of 0.10, 0.15, and 0.20 gFC/gDS (grams of FC over grams of dry solid content). The FC addition resulted in increased pH levels and a significant reduction in microbiological contamination. During the thermal drying of the dehydrated SS, FC has a further positive impact on reducing pathogens to below regulatory limits and drying time. The optimal drying conditions for reducing dehydrated SS moisture content (up to 12%), minimizing drying time, and reducing microbiological contamination levels below the legal limit were 70 °C and 0.20 gFC/gDS. Overall, the current study confirms the beneficial role of FC in improving the drying and disinfection performance of dehydrated SS. These findings support the potential of producing a safer and more sustainable organic soil amendment, thereby contributing to resource recovery and environmental protection.
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