Please use this identifier to cite or link to this item: http://hdl.handle.net/10662/24348
Title: Excess secondary sludge reuse by H2O2 thermal dehydration
Authors: Martínez Udaondo, Ana
Montes Jiménez, Vicente
Gimeno Gamero, Olga
Rivas Toledo, Francisco Javier
Keywords: Wastewater treatmen;Sludge management;Hydrogen peroxide;Adsorbent;Thermal treatment;Circular;Tratamiento de aguas residuales;Gestión de lodos;Peróxido de hidrógeno;Tratamiento térmico
Issue Date: 2024
Publisher: Springer
Abstract: The excess of activated sludge generated in municipal wastewater treatment plants constitutes one of the challenging problems facing modern society. The high-water content of this waste makes difficult the transport, disposal, and management of these solids. In this work, activated sludge excess from a secondary clarifier has been dehydrated by means of a combination of temperature and hydrogen peroxide treatment. Three main operating variables have been considered to affect sludge dewaterability and filterability. Temperature (120–180 °C), hydrogen peroxide dose (0.01–0.03 M), and treatment time (20–60 min) influence have been assessed by completing a 15-run Box Behnken experimental design. Different output variables (water content, resistance to filtration, sedimentation volumetric index, extracellular polymeric substances, etc.) have been monitored. Generally, temperature seems to be the most influencing parameter to obtain a dehydrated sludge with acceptable management/disposal characteristics (sludge volume reduction and filterability). In line with the concept of circular economy, an attempt has been conducted to obtain a sustainable biosorbent from the dehydrated sludge generated in the previous stage. Optimum conditions of carbonization and activation revealed that the solid obtained at 400 °C by using ammonium nitrate as activation agent was the most efficient absorbent to eliminate some model compounds from water (namely, phenol, ofloxacin, and diuron); however, a clear improvement margin in the synthesis is foreseen.
URI: http://hdl.handle.net/10662/24348
DOI: 10.1007/s11356-024-32568-8
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