Banca de DEFESA: LUIZ GUSTAVO MORAES DE MACEDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUIZ GUSTAVO MORAES DE MACEDO
DATE: 04/08/2023
TIME: 14:00
LOCAL: online
TITLE:

PERFORMANCE OF TURBIDITY CURTAINS IN A STORM DRAINAGE SYSTEM APPLIED TO A WASTE ROCK DUMP

KEY WORDS:

Keywords: Silt curtains, geosynthetics, turbidity reduction, drainage system of mine

PAGES: 162
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Lavra
SPECIALTY: Lavra a Céu Aberto
SUMMARY:

In mining, it is common to direct rainwater to the nearest water bodies, seeking to avoid accumulation and infiltration of water in mining structures. However, little is discussed about the minimization of turbidity in the generated effluent because is usual are dams downstream of structures, which stabilize and clarify this effluent. Because the environmental disasters have occurred in recent years, the environmental agencies have been imposing severe restrictions on the creation of new structures. With this, mining has sought other technologies for this purpose to solve the problem of high turbidity of rivers by fine sediments. Thus, it is necessary to import the concept of floating silt curtains to mining and evaluate the performance of these curtains through an experiment in a real structure to sediment containment, susceptible to flow peaks. The present work consists in the evaluation of the performance of turbidity curtains applied in a drainage system of a waste rock deposit of a phosphate rock mining in Alto Paranaíba, which does not have a dam structure that promotes the clarification of the rain effluent in an effective way. The first data collected showed effectiveness above the expected with 92.19% efficiency for the pouring structure (constant flow in lotic environment) and 60.83% with the structure in a lentic environment condition, without damage due to torrential rains. In the following months, a significant reduction in the efficiency of the curtains was evidenced due to the installation geometry adopted, short periods of drought and alteration of the water regime, favoring the generation of reverse flow inside the pond, degrading the efficiency of the system.

COMMITTEE MEMBERS:
Presidente - MARIA DAS GRAÇAS GARDONI ALMEIDA - UFMG
Interna - HERSILIA DE ANDRADE E SANTOS
Externo à Instituição - ENNIO MARQUES PALMEIRA - UnB
Externa à Instituição - KARLA CRISTINA ARAUJO PIMENTEL MAIA