Banca de QUALIFICAÇÃO: JONUHEY FERREIRA DA COSTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JONUHEY FERREIRA DA COSTA
DATE: 24/05/2025
TIME: 09:00
LOCAL: on line
TITLE:

Ionic flocculation of industrial dye using saponified coconut oil and partially hydrolyzed polyacrylamide.

KEY WORDS:

Surfactant, polymer, azo dyes, flocculation.

PAGES: 54
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

The discharge of highly colored industrial effluents is a global environmental concern. Annual dye production reaches approximately 8 × 10⁵ tons, with 25% originating from the textile industry. Textile effluents contaminated with dyes may contain hazardous substances such as acids, teratogens, carcinogens, and xenobiotics, posing risks to both human health and the environment. Untreated azo dyes can alter pH, reduce oxygen levels, and inhibit photosynthesis in aquatic ecosystems. Various effluent treatment methods have been developed, including coagulation/flocculation, which involves the use of coagulant and flocculant agents to facilitate the removal of dissolved and suspended solids. Partially hydrolyzed polyacrylamide (PHPA) is a water-soluble polymer with great potential as a coagulant agent. Saponified coconut oil (SCO) is a highly water-soluble anionic surfactant that readily aggregates into micelles in the presence of available ions. This study aims to investigate the effects of PHPA and SCO in the treatment of highly colored effluent through a coagulation/flocculation process. Flocculation assays will be performed using synthetic effluents containing Reactive Red 195 dye under varying conditions and concentrations of SCO, with and without the addition of PHPA. Using SCO alone in the presence of Ca²⁺ ions resulted in partial dye removal, but removal efficiencies above 80% required optimal conditions, which are not always feasible. The introduction of PHPA into the process broadened the range of favorable conditions, achieving dye removal above 80% under previously unfavorable conditions. However, it also increased the medium's viscosity, promoting floc formation but hindering homogeneous fluid circulation at high concentrations. Flocculation kinetics indicated rapid floc formation and lower turbidity at gentler agitation speeds, where the formed flocs were less likely to break apart.

COMMITTEE MEMBERS:
Presidente - 1308273 - EDUARDO LINS DE BARROS NETO
Externo ao Programa - 1566922 - LINDEMBERG DE JESUS NOGUEIRA DUARTE - UFRNExterna à Instituição - LETÍCIA GRACYELLE ALEXANDRE COSTA - UFRN
Externa à Instituição - PAULA FABIANE PINHEIRO DO NASCIMENTO - ISI-ER