Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water

Filter backwash water (FBW) is a prominent residue from water treatment plants (WTPs) that is often disposed into water bodies or recycled within the WTP without due disinfection. FBW usually contains particles within a size range that includes pathogenic protozoa, as the infective forms of Giardia...

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Autores principales:	Kamila Jessie Sammarro Silva, Lyda Patricia Sabogal-Paz
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	immunofluorescence pathogenic protozoa protozoa recovery water treatment residue Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/13665a1a3b58464c8235718c96252e56
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spelling	oai:doaj.org-article:13665a1a3b58464c8235718c96252e562021-11-05T21:09:11ZFerric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water1751-231X10.2166/wpt.2021.021https://doaj.org/article/13665a1a3b58464c8235718c96252e562021-04-01T00:00:00Zhttp://wpt.iwaponline.com/content/16/2/557https://doaj.org/toc/1751-231XFilter backwash water (FBW) is a prominent residue from water treatment plants (WTPs) that is often disposed into water bodies or recycled within the WTP without due disinfection. FBW usually contains particles within a size range that includes pathogenic protozoa, as the infective forms of Giardia and Cryptosporidium, parasites responsible for waterborne diseases outbreaks. Quantifying (oo)cysts is essential for addressing this matter, as it might assist research on giardiasis and cryptosporidiosis epidemiology, as well as shed light onto disinfection technologies for FBW. However, (oo)cyst recovery from FBW and other complex matrices still lacks a standard protocol and entails specialized professionals and expensive material. Seeking to provide insight in a reduced-cost recovery method, this study analysed the recovery efficiency (RE) obtained by acid flocculation with ferric sulphate, a common coagulant, on bench-scale simulated FBW. Steps included concentration by flocculation, centrifugation, and quantification by immunofluorescence. Although recovery was sufficient for Cryptosporidium parvum (40.59%), Method 1623.1 recommendations were not reached for Giardia muris (1.76%). Coefficients of variation obtained for both organisms were not satisfactory, highlighting the variability to which environmental matrices are subjected and why defining a methodology for (oo)cyst recovery in WTP residues is important. Highlights C. parvum oocyst recovery efficiency (RE) complied with Method 1623.1.; G. muris RE from FBW was insufficient and statistically different from C. parvum's.; Coefficients of variation for both microorganisms were higher than Method 1623.1 limits.;Kamila Jessie Sammarro SilvaLyda Patricia Sabogal-PazIWA Publishingarticleimmunofluorescencepathogenic protozoaprotozoa recoverywater treatment residueEnvironmental technology. Sanitary engineeringTD1-1066ENWater Practice and Technology, Vol 16, Iss 2, Pp 557-565 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	immunofluorescence pathogenic protozoa protozoa recovery water treatment residue Environmental technology. Sanitary engineering TD1-1066
spellingShingle	immunofluorescence pathogenic protozoa protozoa recovery water treatment residue Environmental technology. Sanitary engineering TD1-1066 Kamila Jessie Sammarro Silva Lyda Patricia Sabogal-Paz Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water
description	Filter backwash water (FBW) is a prominent residue from water treatment plants (WTPs) that is often disposed into water bodies or recycled within the WTP without due disinfection. FBW usually contains particles within a size range that includes pathogenic protozoa, as the infective forms of Giardia and Cryptosporidium, parasites responsible for waterborne diseases outbreaks. Quantifying (oo)cysts is essential for addressing this matter, as it might assist research on giardiasis and cryptosporidiosis epidemiology, as well as shed light onto disinfection technologies for FBW. However, (oo)cyst recovery from FBW and other complex matrices still lacks a standard protocol and entails specialized professionals and expensive material. Seeking to provide insight in a reduced-cost recovery method, this study analysed the recovery efficiency (RE) obtained by acid flocculation with ferric sulphate, a common coagulant, on bench-scale simulated FBW. Steps included concentration by flocculation, centrifugation, and quantification by immunofluorescence. Although recovery was sufficient for Cryptosporidium parvum (40.59%), Method 1623.1 recommendations were not reached for Giardia muris (1.76%). Coefficients of variation obtained for both organisms were not satisfactory, highlighting the variability to which environmental matrices are subjected and why defining a methodology for (oo)cyst recovery in WTP residues is important. Highlights C. parvum oocyst recovery efficiency (RE) complied with Method 1623.1.; G. muris RE from FBW was insufficient and statistically different from C. parvum's.; Coefficients of variation for both microorganisms were higher than Method 1623.1 limits.;
format	article
author	Kamila Jessie Sammarro Silva Lyda Patricia Sabogal-Paz
author_facet	Kamila Jessie Sammarro Silva Lyda Patricia Sabogal-Paz
author_sort	Kamila Jessie Sammarro Silva
title	Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water
title_short	Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water
title_full	Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water
title_fullStr	Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water
title_full_unstemmed	Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water
title_sort	ferric sulphate flocculation as a concentration method for giardia and cryptosporidium in filter backwash water
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/13665a1a3b58464c8235718c96252e56
work_keys_str_mv	AT kamilajessiesammarrosilva ferricsulphateflocculationasaconcentrationmethodforgiardiaandcryptosporidiuminfilterbackwashwater AT lydapatriciasabogalpaz ferricsulphateflocculationasaconcentrationmethodforgiardiaandcryptosporidiuminfilterbackwashwater
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Ferric sulphate flocculation as a concentration method for Giardia and Cryptosporidium in filter backwash water

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