@article{Mariñelarena_Di Giorgi_Donadelli_2021, title={Dewatering, Stabilization, and Final Disposal of Waste Activated Sludge in Constructed Wetlands }, volume={25}, url={https://revistas.javeriana.edu.co/index.php/iyu/article/view/26039}, DOI={10.11144/Javeriana.iued25.dsfd}, abstractNote={<p><em>Objective:</em> This research aimed to assay the dehydration and stabilization of surplus biosolids from a wastewater activated sludge treatment plant, with sludge-treatment wetlands, at the Iguazú National Park (Misiones, Argentina). <em>Materials and Methods:</em> A 12-cell sludge-treatment reed beds (STRB) system was built and operated for four years. Afterwards, the accumulated sediments were analyzed for total solids (TS) concentration, volatile solids (VS) reduction, specific oxygen-uptake rate (SOUR), and heavy metals and pathogens concentrations. <em>Results and Discussion:</em> TS concentration increased from 0.55 % to 14.3 %, VS were reduced by 33.3 %, and SOUR lowered to 1.09 mg O<sub>2</sub>gTS<sup>-1</sup> h<sup>-1</sup>. These figures and the final concentrations of heavy metals and pathogenic microorganisms (102 MPN E.coli.gTS<sup>-1</sup>) indicated a degree of stabilization and sanitation that allowed classifying these biosolids as Class A, according to the Argentine guidelines, National Resolution 410/18, and enabled their reuse for soil amendment in landscapes and other agronomic purposes. <em>Conclusion:</em> The technology tested showed good results applied under a tropical climate, with annual temperatures between 17 and 27 °C, rainfall of 1870 mm y<sup>-1</sup>, and planted with autochthonous vegetation. Furthermore, it allowed the reuse of 221 t (144 m<sup>3</sup>) of a harmless product in an environmentally sustainable way.</p>}, journal={Ingenieria y Universidad}, author={Mariñelarena, Alejandro Jorge and Di Giorgi, Hugo and Donadelli, Jorge}, year={2021}, month={Jun.} }