Banca de DEFESA: YAN NUNES DIAS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : YAN NUNES DIAS
DATE: 23/02/2022
TIME: 09:00
LOCAL: meet.google.com/nck-qata-cya
TITLE:

"Use of Amazonian biochars in the remediation of arsenic-rich mining residues from gold mining in the Amazon"

KEY WORDS:

Pyrolysis; Mining waste; Cachoeira do Piriá

PAGES: 102
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

The mining process generates large amounts of solid waste, which have large amounts of potentially toxic elements (PTE’s), which are extremely harmful to the environment and human health (eg arsenic). An example is MAPE (artisanal and small-scale mining) in the municipality of Cachoeira do Piriá, state of Pará, where gold exploration is carried out. In this context, this research relates the use of biochar to reduce bioavailability and
its integration in the assessment of the risk caused by arsenic (As) from gold mining residues, with the purpose of use in environmental remediation programs. In chapter 1, the influence of 3 biochars (açaí kernel, Brazil nut husk and palm kernel cake) on two types of mining residues was evaluated, applied at a rate of 5%. The addition of the 3 biochars provided the accumulation of As in more stable fractions and consequently decreased the bioavailability of As in the two residues. In chapter 2, the influence of enrichment of biocavion with phosphorus (P) using single and triple superphosphate (SFS and SFT) on bioaccessibility, As accumulation in lettuce (Lactuca Sativa) and the interaction of biochar in the evaluation of risk to human health through ingestion of
contaminated soil and plant material. All biochars increased the bioaccessibility of As, due to the increase of P contents in the residue. The addition of biochars provided a decrease in the translocation and accumulation of As in lettuce leaves, with the exception of the excess P condition (SFT). The addition of enriched biochars provided a decrease in risk assessment (HI) levels, mainly related to a decrease in As accumulation in lettuce leaves. The enrichment with SFS obtained the best results mainly in the availability of nutrients, reduction of the accumulation of As in the lettuce leaves and therefore it can be indicated as an environmental remedy, mainly with the help of phytoremediation species.

BANKING MEMBERS:
Externo ao Programa - 2133889 - ANDERSON MARTINS DE SOUZA BRAZ
Presidente - 6388356 - ANTONIO RODRIGUES FERNANDES
Externa à Instituição - EDNA SANTOS DE SOUZA - UNIFESSPA
Externa à Instituição - EMMA FERNÁNDEZ COVELO - UVIGO
Interno - 030.493.086-56 - SILVIO JUNIO RAMOS - ITV