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9 results on '"Stazi, Valentina"'

3. The Ultimate Fate of Reactive Dyes Absorbed onto Polymer Beads: Feasibility and Optimization of Sorbent Bio-Regeneration under Alternated Anaerobic–Aerobic Phases.

Author

Mosca Angelucci, Domenica, Stazi, Valentina, and Tomei, Maria Concetta

Subjects
INDUSTRIAL wastes, SUSTAINABILITY, BIOPOLYMERS, REACTIVE polymers, REACTIVE dyes
Abstract

Dyes employed in many production cycles are characterized by high toxicity and persistence in the environment, and conventional wastewater treatments often fail to reach high removal efficiencies. Consequently, there is an increasing research demand aimed at the development of more efficient and sustainable technologies. A two-step strategy consisting of dye sorption followed by sorbent bio-regeneration is proposed here, with a special focus on the regeneration step. The objective of this study was to establish the best operating conditions to achieve regeneration of dye-loaded polymers and concurrently the ultimate removal of the dyes. To this aim, the bio-regeneration of the Hytrel 8206 polymer, used as a sorbent material to remove Remazol Red dye from textile wastewater, was investigated in a two-phase partitioning bioreactor (TPPB) under alternated anaerobic–aerobic conditions. Comprehensive analysis of operational parameters, including sorbent load and initial contamination levels, was conducted to optimize bio-regeneration efficiency. Experimental data demonstrated high regeneration efficiencies (91–98%) with biodegradation efficiencies up to 89%. This study also examines the biodegradation process to investigate the fate of biodegradation intermediates; results confirmed the successful degradation of the dye without significant by-product accumulation. This research underscores the potential of TPPB-based bio-regeneration of polymeric sorbent material for sustainable wastewater treatment, offering a promising solution to the global challenge of dye pollution in water resources. [ABSTRACT FROM AUTHOR]

Published
2024
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9. On-site treatment of dye-bath wastewater with a two-stage polymer extraction and biological regeneration process

Author

Mosca Angelucci Domenica, Stazi Valentina, and Tomei M.Concetta

Abstract

In this study, we propose a two-stage process consisting in an extraction stage, realized by contacting the dye bath stream with absorptive polymers, followed by polymer regeneration in a two-phase partitioning bioreactor (TPPB). TPPBs consist of a cell-containing aqueous phase and a sequestering/partitioning phase (generally polymer beads when applied to liquid streams decontamination) able to reduce the aqueous concentrations of toxic substrates to which the biomass is exposed. Restoring the thermodynamic equilibrium, following the substrate consumption, determines the pollutant release to the cells based on metabolic demand (Quijano et al., 2009). The two-stage process, previously applied to soil decontamination (Tomei et al., 2013), is well suitable for dye removal because, given the different optimal operating conditions characterizing the extraction and regeneration stages, allows the separate optimization of the performance of each stage. A possible practical application of the proposed process is the on-site polymer extraction for dye removal achievable in very short times (of the order of hours) and the subsequent bioregeneration of the contaminated polymer beads utilized in more extraction cycles. Objective of this study is to investigate and optimize the operating conditions of the two-stage process applied to the decolourization of a contaminated stream containing the reactive azo dye Remazol Red (RR).

Published
2018

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