FRD - Investigación - Ciencia y Tecnología

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    Enhancing biodegradation of vegetable oil-contaminated soil with soybean texturized waste, spent mushroom substrate, and stabilized poultry litter in microcosm systems.
    (2024-06) Conde Molina, Debora; Di Gregorio, Vanina
    Industrial activities contribute to environmental pollution, particularly through unregulated effluent discharges, causing adverse effects on ecosystems. Vegetable oils, as insoluble substances, exacerbate this pollution, forming impermeable films and affecting the oxygen transfer, leading to serious habitat disruption. Organic wastes, such as soybean texturized waste, spent mushroom substrate, and stabilized poultry litter, were assessed for their efficacy in enhancing the degradation of vegetable oil in contaminated soil. For this purpose, contaminated soil was amended with each of the wastes (10% w/w) using microcosm systems, which were monitored physico-chemically, microbiologically and toxicologically. Results indicate that the wastes promoted significant oil degradation, achieving 83.1, 90.7, and 86.2% removal for soybean texturized waste, spent mushroom substrate, and stabilized poultry litter, respectively, within a 90-day period. Additionally, they positively influenced soil microbial activity, as evidenced by increased levels of culturable microorganisms and hydrolytic microbial activity. While bioassays indicated no phytotoxicity in most cases, soybean texturized waste exhibited inhibitory effects on seed germination and root elongation of Lactuca sativa. This study significantly enhances our comprehension of remediation techniques for sites tainted with vegetable oils, highlighting the critical role of organic waste as eco-friendly agents in soil restoration. Emphasizing the practical implications of these findings is imperative to underscore the relevance and urgency of addressing vegetable oil contamination in soil. Moving forward, tailored strategies considering both contaminant characteristics and soil ecosystem traits are vital for ensuring effective and sustainable soil remediation.
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    Vegetable oil contaminated sites: bioremediation treatments.
    (2023-07) Conde Molina, Debora; Corpus, Athina; Piperata, Gabriela
    The environment is negatively impacted by occasional discharges from industrial activity. When these events contain insoluble compounds such as fats and oils, they are high impact pollutants. This work focuses on an environmental problem in the industrial area of Buenos Aires, Argentina, where a lagoon was contaminated by vegetable oil residues. The aim of this work is to study bioremediation strategies in order to propose solutions for the remediation of the lagoon. For this way, autochthonous vegetable oil degrading bacteria were isolated from Lagoon 3, and the conditions to produce bacterial biomass were evaluated. Then, through microcosms systems using contaminated coastal soil, different site-specific treatments were tested: a control as natural attenuation; a bioaugmentation treatment with autochthonous vegetable oil degrading bacteria; two biostimulation treatments with nitrogen and phosphorus, and with spent mushroom substrate. Although both bioaugmentation and biostimulation showed promising results, biostimulation with N, P was the most effective for site-specific bioremediation of Lagoon 3, achieving 67% of oil vegetable reduction at 60 days.