Banca de DEFESA: LUIZ ANTONIO DO NASCIMENTO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : LUIZ ANTONIO DO NASCIMENTO
DATA : 26/05/2017
HORA: 08:30
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:
"Application of the polyacrylamide on flocculation of metallic cations"
PALAVRAS-CHAVES:
Ionic polyacrylamide; Flocculation; Chemical precipitation, Heavy metals.
PÁGINAS: 115
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:
The increase in the levels of contaminants agents of anthropic origin is associated to the development of industrial activity around the world. The action of the industries in this case, is caused by large volume of wastewater with high concentration or with a variety of contaminant. Heavy metals are generally seen as damage substances to human and animal health. However, they are increasingly being used in many important products to our day to day, this can to increasing numbers of people exposed to direct or indirect contamination. Contamination, and eventual poisoning, by heavy metals in some places is somewhat chronic, since their symptoms do not appear immediately, and the process is developed for a very long time. Therefore, several techniques to treatment have been developed to guarantee the maximum safety possible in discard these residues. One of the most commonly used techniques to treat metals dissolved in aqueous solution is a chemical precipitation. Adjustment of pH or addition of a flocculating agent is a basic condition to carry out this technique. Ionic polyacrylamide is an organic-based polymer having active sites in its chain able to uptake metal cations from an aqueous solution. In this work, it shows a zinc removal efficiency rise from 30 to 70% when the pH of the solution is incremented from 4.5 to 7.0 and exceeded 70% in tests with copper without variation in pH. In an action combined with CTAB, removal efficiency reaches 20% to 40%, with only one addition this surfactant at a concentration that was twofold the concentration of Zn2+ ions. The treatment of a real effluent from galvanic plant containing nickel and copper was analyzed, polyacrylamide shows to be more selective to copper whose removal efficiency reaches 30% while 10% is obtained for nickel without any other auxiliary compound. Polyacrylamide also acting well as an inhibitor of incrustation due to maintain Ca2+ ions in solution even at high temperature. Therefore, it can be said that polyacrylamide is polyvalent and is capable to accomplish the function of being a flocculating agent of metal cations dissolved in an aqueous solution.
MEMBROS DA BANCA:
Externo à Instituição - ANDRE EZEQUIEL GOMES DO NASCIMENTO - UFRN
Interno - 1308273 - EDUARDO LINS DE BARROS NETO
Interno - 1670497 - HUMBERTO NEVES MAIA DE OLIVEIRA
Externo à Instituição - JOSELISSE SOARES DE CARVALHO SANTOS - IFRN
Presidente - 347567 - MARCIA MARIA LIMA DUARTE
Externo à Instituição - RICARDO PAULO FONSECA MELO - UFERSA