Banca de QUALIFICAÇÃO: LUCAS LOPES SAMAGAIO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCAS LOPES SAMAGAIO
DATE: 20/04/2023
TIME: 14:00
LOCAL: https://conferenciaweb.rnp.br/webconf/wagner-27
TITLE:

Recovery of Phosphorus and Ammonium from Effluents from the Autocatalytic Deposition Process of Nickel as Struvite

PAGES: 25
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Físico Química Inorgânica
SUMMARY:

Phosphorus is a fundamental chemical element for use as a fertilizer in agriculture. Currently, there are two problems involving this resource: its depletion, expected to occur in this century, and its presence in excessive amounts in water bodies, causing the phenomenon of eutrophication. In this context, the present work aims to recover the phosphorus and ammonium present in process effluents for the deposition of nickel by autocatalytic process. This effluent in particular, due to the oxidation-reduction reaction that occurs so that the deposition of nickel is carried out on the surface of the desired material, starts to have high concentrations of phosphorus species, mainly phosphite, derived from the oxidation of hypophosphite added as a reducing agent during the process. The effluent, after Ni2+ removal, will be submitted to advanced oxidative processes and subsequent precipitation of struvite. In this way, first the characterization of the industrial effluent was carried out, followed by the removal of Ni2+, reducing Ni2+ to Ni0. After nickel removal, another effluent characterization was performed. From the characteristics of the effluent, the production of phosphite was carried out in order to prepare a synthetic effluent that has the maximum similarity to the real condition of the industrial effluent, using the same principle of the redox reaction between nickel and hypophosphite. Ni2+ concentration showed a reduction of 99.99% after treatment. In contrast, phosphite (HPO32-) had its concentration increased by 27%. The study of phosphite production showed that nickel-catalyzed oxidation of hypophosphite also produced phosphate. At the end of the investigation, it is intended to establish adequate procedures for obtaining struvite from the effluent, favoring its use as fertilizer and avoiding inappropriate disposal in water bodies.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1601156 - WAGNER ALVES CARVALHO
Membro Titular - Examinador(a) Interno ao Programa - 1838759 - JANAINA DE SOUZA GARCIA
Membro Titular - Examinador(a) Interno ao Programa - 1814655 - LUCIA HELENA GOMES COELHO
Membro Suplente - Examinador(a) Interno ao Programa - 2351974 - JULIANA DOS SANTOS DE SOUZA