Banca de QUALIFICAÇÃO: CAROLINA TAVARES PAULA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAROLINA TAVARES PAULA
DATA : 28/04/2017
HORA: 14:00
LOCAL: Sala de Aula do LARHISA/UFRN
TÍTULO:

INFLUENCE OF ANAEROBIC HRT ON THE EFFICIENCY OF ACTIVATED SLUDGE SYSTEMS WITH BIOLOGICAL NITROGEN AND PHOSPHORUS REMOVAL

PALAVRAS-CHAVES:

Activated sludge. Continuous-flow reactor. Biological nutrient removal. Anaerobic hydraulic retention time.

PÁGINAS: 16
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Sanitária
RESUMO:

Nutrient removal in Wastewater Treatment Plants (WWTP) is an essential process for the preservation of water bodies quality. Phosphorus removal from the influent is especially important, being a limiting nutrient for eutrophication in water bodies in most cases. Biological phosphorus removal (BPR) is performed by the circulation of sludge through anaerobic and aerobic zones, promoting its enrichment with phosphorus accumulating organisms (PAOs). A WWTP alternative, which is being widely used in hot climate regions, is activated sludge (AS) as a post-treatment of anaerobic reactors, wich has the great advantage of reducing the influent organic load to the AS system. This allows a reduction of the oxygen demand and the sludge mass produced in the aerobic system. At this WWTP alternative, the anaerobic reactor is designed for a high hydraulic retention time (HRT), from 6 to 10 hours, so that it can significantly contribute to the removal of organic matter, and does not allow the circulation of sludge through the system, wich makes BPR impossible. However, in WWTP that includes BPR, the anaerobic zone is operated at low HRT (0,5-1 hour), whose function is basically to promote the development of PAOs in detriment of other microorganisms, allowing their circulation through the system. Thus, by designing the anaerobic zone with higher TDH and allowing sludge circulation through the system, it would be possible to remove the phosphorus biologically and reduce the organic load affluent to the aerobic system. Previous studies have presented that extending anaerobic HRT in BPR systems cause damage to the process efficiency, whereas other studies point out that extended anaerobic conditions do not prejudice the BPR performance. Therefore, the objective of this study is to evaluate the influence of anaerobic HRT on the activated sludge system with simultaneous biological removal of nitrogen and phosphorus.

MEMBROS DA BANCA:
Interno - 376.950.452-68 - ANDRE LUIS CALADO ARAUJO - IFRN
Interno - 346736 - CICERO ONOFRE DE ANDRADE NETO
Presidente - 1759924 - HELIO RODRIGUES DOS SANTOS