Banca de QUALIFICAÇÃO: MARIA DENISE BARBOSA GOMES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA DENISE BARBOSA GOMES
DATE: 16/12/2024
TIME: 13:30
LOCAL: híbrido (link ainda a definir/local sala de aula do LARHISA)
TITLE:

Phosphorus sorption by oxidic soil: Strategies for mitigating eutrophic waters in the Brazilian semiarid region

KEY WORDS:

pH; humic substances; eutrophication; geoengineering.

PAGES: 24
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Saneamento Ambiental
SPECIALTY: Controle da Poluição
SUMMARY:

Eutrophication is one of the problems that affect the water quality of lakes and reservoirs, causing several impacts on aquatic biota and ecosystem services. Strategies to mitigate eutrophication involve everything from reducing external sources to blocking internal fertilization. Geoengineering can be used as a technique to mitigate eutrophic waters, through materials with affinity for phosphate adsorption, such as Lanthanum Modified Bentonite, which is expensive and makes its application unfeasible in developing countries. Natural adsorbents, such as soils, bauxites and zeolites, have been evaluated as alternatives to high-cost commercial products. In this approach, there is a need to expand studies to use natural soils with greater sorption capacity, such as oxidic soil. Thus, the objective of the study was to investigate the phosphorus sorption potential of an oxidic tropical soil in the mitigation of eutrophic environments in the semiarid region. The sorption experiment was conducted in triplicate with water from three eutrophic reservoirs. The natural sorbent used in the sorption tests was a Dystroferric Red Nitosol. After applying the sorbent to the solutions, the tubes were continuously agitated at 200 rpm for 24 hours. In addition to phosphate, pH and humic substances were evaluated. The tested soil showed phosphorus sorption potential, mainly at initial concentrations, between 0 and 2.5 mg.L-1. The maximum capacity indicated by the Langmuir isotherm was similar for the water from the three reservoirs. The sorption behavior can be explained by the presence of Fe and Al in the sorbent. There was no significant change in the initial and final pH readings in two of the three reservoirs studied. Humic substances were reduced after the sorption experiment. In summary, the use of phosphorus sorbents, such as the tested Nitosol, with removal efficiencies at concentrations comparable to real reservoir conditions, shows promise as a cost-effective and accessible strategy for mitigating eutrophic waters. Moreover, it holds potential to inspire further studies that take into account the specific characteristics of the region.

COMMITTEE MEMBERS:
Presidente - 1764855 - VANESSA BECKER
Externa ao Programa - 3919045 - JULIANA DELGADO TINOCO - UFRNExterna ao Programa - 1662859 - KARINA PATRICIA VIEIRA DA CUNHA - UFRNExterna à Instituição - FERNANDA MONICELLI CÂMARA BRITO - IFRN