Banca de DEFESA: DANIEL VALENCIA CARDENAS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DANIEL VALENCIA CARDENAS
DATE: 26/10/2023
TIME: 09:00
LOCAL: Sala de Informática do PPGTARH com Transmissão pela Plataforma MS Teams
TITLE:

Pilot-scale evaluation of the removal and effects of cylindrospermopsin on the performance of conventional slow sand filters

KEY WORDS:

Conventional slow sand filtration, cylindrospermopsin, schmutzdecke, microbiota

PAGES: 117
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Recursos Hídricos
SUMMARY:

The occurrence of toxic cyanobacterial blooms is a matter of public health interest, mainly when they occur in water supplies. Cyanotoxins such as cylindrospermopsin (CYN) present a risk to public health and a challenge for water treatment systems since conventional water treatment does not easily remove this toxin. Conventional slow sand filtration is still used to supply small communities and can potentially remove CYN. In this context, this thesis evaluated the removal efficiency of CYN by conventional slow sand filtration during the ripening period and the operation of ripened filters, as well as its influence on the removal of other water quality parameters and its impact on the microbiota developed in the schmutzdecke. A pilot-scale conventional slow sand filtration system was operated and exposed to periods of contamination of the affluent with CYN. The cyanotoxin did not influence the removal of water quality parameters. However, the presence of this substance during the ripening period determined the development of head loss. The presence of CYN during the ripening period also influenced the bacterial community. The ripened filters removed the toxin to levels below 1 µg/L. The composition of the planktonic and benthic communities of the ripened slow sand filters was not affected by intermittent exposure to CYN. The removal of the cyanotoxin was attributed mainly to biodegradation. This work demonstrated that conventional slow sand filtration is robust and effectively removes CYN, with no significant impacts on the microbiota that develops in the biological layer.

COMMITTEE MEMBERS:
Interna - 1122604 - CRISTINA CELIA SILVEIRA BRANDAO
Externa à Instituição - LYDA PATRÍCIA SABOGAL PAZ - USP
Externo à Instituição - MAURICIO LUIZ SENS - UFSC
Interna - 1509161 - RAQUEL MORAES SOARES
Presidente - 1646057 - YOVANKA PEREZ GINORIS