Bioingeniería
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Browsing Bioingeniería by Subject "Agua Residual Doméstica"
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Item Fitotoxicidad de los lodos generados en un sistema de lodos activados modalidad aireación extendida para el tratamiento de agua residual doméstica(Universidad Santiago de Cali, 2023) Millán Bueno, Angélica María; Córdoba Agredo, Linda Lucia; Cardenas Talero, José Luis (Director)The increase in global population has led to a considerable increase in the generation of wastewater, which poses challenges in its treatment and management of its by-products. Sewage sludge varies according to treatment systems, with activated sludge systems in the extended aeration mode being essential in the degradation of organic matter. These sludges are rich in nutrients and organic matter, which makes them valuable as fertilizers, but their use in agriculture requires caution due to possible contaminants. Phytotoxicity, which evaluates the effect of sludge on plant growth, is a critical factor. It is performed by seed germination tests to determine safe concentrations of sludge and avoid exposure to contaminants. The project evaluated the phytotoxicity of sludge generated in extended aeration activated sludge systems during domestic wastewater treatment. The sludge tested maintained pH values within the appropriate range for acidic soils. While the secondary sludge is not considered biologically stabilized and presents a microbiological risk, the dewatered sludge with a drying time of 25 days is considered biologically stabilized. Both sludges show phytotoxicity, which varies with the ratio of sludge to soil, the sludge-soil mixtures showed different levels of phytotoxicity; the 100-0 sludge-soil ratio was highly phytotoxic, a ratio of 75-25 decreased phytotoxicity, while a ratio of 50-50 allowed germination and the combination of 25-75 significantly favored germination. Dehydrated sludge has potential as a fertilizer, but its use should be conditioned mainly by the microbiological risk.