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Hydrochar from sawdust and sewage sludge - a potential media for retaining heavy metals in sustainable drainage systems (SuDS).
Cavali, Matheus; Kim, Boram; Tedoldi, Damien; Benbelkacem, Hassen; Bayard, Rémy; Garnier, Vincent; Libardi, Nelson; Woiciechowski, Adenise Lorenci; Borges de Castilhos, Armando.
Affiliation
  • Cavali M; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil.
  • Kim B; DEEP, UR7429, INSA Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
  • Tedoldi D; DEEP, UR7429, INSA Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
  • Benbelkacem H; DEEP, UR7429, INSA Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
  • Bayard R; DEEP, UR7429, INSA Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
  • Garnier V; CNRS, MATEIS, UMR5510, INSA Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
  • Libardi N; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil.
  • Woiciechowski AL; Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Curitiba, Brazil.
  • Borges de Castilhos A; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil.
Environ Technol ; : 1-11, 2024 Oct 07.
Article in En | MEDLINE | ID: mdl-39374297
ABSTRACT
Waste valorization is an essential aspect of sustainable development. From this perspective, co-hydrothermal carbonization (Co-HTC) is a promising thermochemical process for converting organic waste into hydrochar. Hydrochar is a solid material whose physicochemical properties could make it suitable for adsorbing pollutants such as heavy metals. Accordingly, this work evaluated the hydrochar from Co-HTC of sawdust and non-dewatered sewage sludge as a potential adsorbent of heavy metals at low concentrations. In the context of sustainable drainage systems (SuDS), it is notable that heavy metals are present at very low but still potentially harmful concentrations, which presents a potential opportunity for the application of hydrochar. Thus, three hydrochars (H-180, H-215, and H-250), produced by Co-HTC at 180, 215, and 250 °C, were tested herein for their ability to retain lead (Pb2+). The H-180 presented better performance than other hydrochars (H-215 and H-250), suggesting that chemisorption could be the main adsorption mechanism. Interestingly, the presence of other cationic heavy metals (Cu2+, Zn2+, Cd2+, Cr6+, and Ni2+) did not hinder the Pb2+ adsorption, for which the removal efficiency remained close to 100%. In fact, in such a multi-metal system, hydrochar can be suitable for capturing both lead and cadmium. Therefore, the hydrochar from Co-HTC of sawdust and non-dewatered sewage sludge can be useful for removing heavy metals at low concentrations, such as those found in urban runoff waters. Although further studies are required, these findings suggest hydrochar as a potential material for application in SuDS.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Environ Technol Journal subject: SAUDE AMBIENTAL / TOXICOLOGIA Year: 2024 Document type: Article Affiliation country: Brazil Country of publication: United kingdom

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Environ Technol Journal subject: SAUDE AMBIENTAL / TOXICOLOGIA Year: 2024 Document type: Article Affiliation country: Brazil Country of publication: United kingdom