Hydrochars from compost derived from municipal solid waste: Production process optimization and catalytic applications

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Roman, FF (Author) Other; de Tuesta, JLD (Author) Other; Praca, P (Author) Other; Silva, Adrian (Author) FEUP; Joaquim Luís Faria (Author) FEUP; Gomes, HT (Author) Other

Journal

Title: Journal of Environmental Chemical Engineering

Vol. 9

ISSN: 2213-3437

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Associated Projects

LA LSRE-LCM - Financiamento Plurianual 2020-2023 para a Unidade LA LSRE-LCM Laboratório de Processos de Separação e Reacção - Laboratório de Catálise e Materiais

Other information

Authenticus ID: P-00T-7HK

DOI: 10.1016/j.jece.2020.104888

Abstract (EN): Catalytic hydrochars were produced by hydrothermal carbonization (HTC) of compost derived from Municipal Solid Waste (MSW). The HTC process was studied through a Design of Experiments to assess the influence of the variables: (i) time (1-5 h), (ii) load of compost (1-4 g in 30 mL) and, (iii) temperature (150-230 degrees C). Total organic carbon (TOC), conductivity and volume variation of the liquid fraction, as well as the mass and carbon content of the solid fraction (hydrochars), were the evaluated responses. Reliable models (R-2 > 0.95 and p-values < 0.05) were fitted to the responses, and the load of compost was found as the most significant variable influencing the process. The Fenton reaction was proposed as an effective treatment of the liquid fraction generated from HTC of compost. A TOC abatement of 73% was obtained after 24 h of reaction under the studied operating conditions (80 degrees C, initial pH 3.0, 100 mg L 1 Fe+2 and two times the stoichiometric amount of H2O2 needed for the complete mineralization of the TOC present in the liquid fraction). The hydrochars produced show high catalytic activity in the decomposition of H2O2, a reaction of interest in a variety of chemical processes, 100% of H2O2 degradation being obtained after 6 h of reaction.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9