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1 Polish Journal of Materials and Environmental Engineering

1 2023

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Wpływ chemicznego kondycjonowania na własności grawitacyjne osadu czynnego nadmiernego

Grübel Klaudiusz, Duda Marta

Polish Journal of Materials and Environmental Engineering

2023

Vol. 5 (25)

23--31

The formation of sludge is an inevitable consequence of wastewater treatment processes and their disposal and utilization requires knowledge, technology and engineering. Sulfate radical-based advanced oxidation processes (SR-AOPs) are gaining popularity as a fea-sible alternative for sludge conditioning and removing recalcitrant pollutants in an aqueous environment. Application of the pretreatment processes/conditioning allows to obtain better mechanical properties of sludge. In the last decade can be noticed a lot of research from around the world focused on new methods of conditioning of sludge, i.e. the processes of disin-tegration, of which the destruction of the mechanical, chemical and biological. Nowadays, advanced oxidation processes (AOPs) has been proposed as one of the most promising technology over conventional water treatment processes to destroy persistent or-ganic contaminants, as well as better sludge conditioning. Persulfate-based AOPs have attracted significant interest in the AOPs due to the following merits: 1) lower costs of storage and trans-portation; 2) easy availability of persulfate salts; 3) high yield of sulfate radicals formation and their longer half-life compared to other reactive oxygen species in AOPs. Persulfates, namely peroxydisulfate (PDS), are the most common sulfate radical donors. In order to generate them the peroxide bonds of persulfates can be cleaved homolytically or heterolyt-ically by various activation methods. SR-AOPs activation by heat is considered feasible due to the high concentration of radicals produced as well as the lack of catalysts leaching. The research focuses on determining the impact of activated PDS on the gravitational surplus activated sludge properties. Characteristic parameters were determined in sludge sedimenta-tion processes, i.e. the rate of descent and compaction, sludge density index and sludge volume index, and changes in the supernatant liquid. Conditioned sewage sludge with PDS activated by microwaves changes its sedimentation parameters: the sludge volume index de-creased with the dose of PDS and was dependent on it, the settling of the conditioned sludge occurred with the highest intensity in the first minutes of gravitational thickening, the oxidation efficiency of the formed radicals caused a decrease in the turbidity and color of the supernatant liquid.