Banca de DEFESA: MARIA EDUARDA BORGES DE ALMEIDA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA EDUARDA BORGES DE ALMEIDA
DATE: 31/01/2025
TIME: 15:00
LOCAL: meet.google.com/pwt-zrvo-tad
TITLE:

Bioaccumulation study of toxic metals in Lactuca sativa l. cultivated in the presence of sludge produced in water treatment plants and galvanic and textile industries

KEY WORDS:

Lettuce; Contaminants; Phytotoxicity; Industrial sludge

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

The use of industrial waste in agriculture has been widely studied as a sustainable alternative to minimize environmental impacts caused by improper disposal and to promote reuse of it. However, the presence of toxic metals in industrial sludge poses a significant challenge. The study aimed to evaluate the effects of different concentrations of sludge from a water treatment plant (WTP), galvanizing, and textile industry, incorporated into the soil, on the growth and development of Lactuca sativa L. A bibliometric review was conducted to map scientific publications and global trends in the utilization of these wastes, focusing on their applications and challenges in environmental and agricultural contexts. The experiment was conducted in a greenhouse with temperature and humidity monitoring. Different sludge dosages were added to the soil in proportions of 1%, 5%, 10%, 25%, 50%, and 75% for the treatments. The soil and sludge were characterized based on physicochemical parameters, including pH, electrical conductivity, solids series, and heavy metal concentrations (Zn, Al, Mn, Fe, Ni, Cd, Pb, and Cr). The plants were evaluated for leaf count, length, fresh and dry weight, and metal concentrations to calculate the Bioconcentration Factor (BCF). No aluminum bioaccumulation was observed in any treatment. The plants showed better development with galvanic sludge, as evidenced by higher averages in the analyzed parameters and phenotypic characteristics such as leaf color and plant size. For galvanic sludge, the BCF remained <1 for most metals, except for Cd, Pb, and Zn in four dosages. Conversely, for WTP and textile sludge, the BCF remained >1 for all dosages for Cd and Zn, with notable results for Mn, Ni, and Pb in textile sludge. This was reflected in the poor development of lettuce in these treatments, with total plant death observed at 10% WTP sludge and 50% textile sludge dosages. This study confirmed the toxic potential of heavy metals on plant development and possible food safety risks due to bioaccumulation. Additionally, it provides insights for developing safer and more sustainable practices for managing these wastes in agricultural reuse contexts.

COMMITTEE MEMBERS:
Externo à Instituição - RONALDO FAUSTINO DA SILVA
Presidente - ROSANGELA GOMES TAVARES
Interno - VICENTE DE PAULO SILVA