Banca de DEFESA: JOÃO FELIPE DA SILVA GONÇALVES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOÃO FELIPE DA SILVA GONÇALVES
DATE: 26/02/2026
TIME: 13:30
LOCAL: Embrapa Agrobiologia-Sala Multimieios
TITLE:

Ecotoxicological Assessment of Urban Solid Waste Compost for Agricultural Purposes

KEY WORDS:

Sustainability, Terrestrial Ecotoxicology, Eisenia andrei, Folsomia candida, Waste Variability.

PAGES: 80
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Composting of urban solid waste presents itself as an alternative for sustainable management; however, feedstock variability may imply ecotoxicological risks. This study evaluated the quality and toxicity of different batches of an urban organic compost, produced on an industrial scale, focusing on the interaction with soil biota and plants. Physical and chemical characterizations of the compost and ecotoxicological assays (Eisenia andrei, Folsomia candida, Lactuca sativa, and Cucumis sativus) were performed in mixtures of natural soil (Argisol) with increasing doses of the compost (0, 5, 10, 20, 30, and 40%), covering three distinct annual batches (2023, 2024, and 2025). Physical characterization revealed that the most recent batches (2024 and 2025) presented high microporosity and low density, acting as retainers of moisture and contaminants. Ecotoxicological results demonstrated severe and increasing toxicity over the years: while the 2023 batch presented lower impact, the 2024 and 2025 batches caused massive lethality (>90%) and total inhibition of soil fauna reproduction at concentrations above 20%. Strong avoidance behavior was observed in E. andrei, indicating the presence of repellent substances or unfavorable physical conditions. In plant assays, inhibition of germination and root development occurred at higher doses, although low concentrations (5%) stimulated growth (hormetic effect). It is concluded that, despite the fertilizing potential at low doses, the indiscriminate use of this urban compost presents acute risks to soil biota, exacerbated by batch variability and physical characteristics that potentiate contaminant bioavailability. Rigorous quality control and dose restriction are recommended to ensure environmental safety.

COMMITTEE MEMBERS:
Presidente - ***.320.637-** - MARIA ELIZABETH FERNANDES CORREIA - EMBRAPA
Interno - 1060711 - MARCOS GERVASIO PEREIRA
Externa à Instituição - MIRIAM DE OLIVEIRA BIANCHI - UFRRJ