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Cryptosporidium and Giardia removal by secondary and tertiary wastewater treatment.

Abstract

Wastewater disposal may be a source of environmental contamination by Cryptosporidium and Giardia. This study was conducted to evaluate the prevalence of Cryptosporidium oocysts and Giardia cysts in raw and treated wastewater effluents. A prevalence of 100% was demonstrated for Giardia cysts in raw wastewater, at a concentration range of 10 to 12,225 cysts L(-1), whereas the concentration of Cryptosporidium oocysts in raw wastewater was 4 to 125 oocysts L(-1). The removal of Giardia cysts by secondary and tertiary treatment processes was greater than those observed for Cryptosporidium oocysts and turbidity. Cryptosporidium and Giardia were present in 68.5% and 76% of the tertiary effluent samples, respectively, at an average concentration of 0.93 cysts L(-1) and 9.94 oocysts L(-1). A higher detection limit of Cryptosporidium oocysts in wastewater was observed for nested PCR as compared to immune fluorescent assay (IFA). C. hominis was found to be the dominant genotype in wastewater effluents followed by C. parvum and C. andersoni or C. muris. Giardia was more prevalent than Cryptosporidium in the studied community and treatment processes were more efficient for the removal of Giardia than Cryptosporidium. Zoonotic genotypes of Cryptosporidium were also present in the human community. To assess the public health significance of Cryptosporidium oocysts present in tertiary effluent, viability (infectivity) needs to be assessed.

Authors+Show Affiliations

a Water Quality Research Laboratory, Ministry of Health , Tel Aviv , Israel.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26301853

Citation

Taran-Benshoshan, Marina, et al. "Cryptosporidium and Giardia Removal By Secondary and Tertiary Wastewater Treatment." Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, vol. 50, no. 12, 2015, pp. 1265-73.
Taran-Benshoshan M, Ofer N, Dalit VO, et al. Cryptosporidium and Giardia removal by secondary and tertiary wastewater treatment. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2015;50(12):1265-73.
Taran-Benshoshan, M., Ofer, N., Dalit, V. O., Aharoni, A., Revhun, M., Nitzan, Y., & Nasser, A. M. (2015). Cryptosporidium and Giardia removal by secondary and tertiary wastewater treatment. Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, 50(12), 1265-73. https://doi.org/10.1080/10934529.2015.1055152
Taran-Benshoshan M, et al. Cryptosporidium and Giardia Removal By Secondary and Tertiary Wastewater Treatment. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2015;50(12):1265-73. PubMed PMID: 26301853.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cryptosporidium and Giardia removal by secondary and tertiary wastewater treatment. AU - Taran-Benshoshan,Marina, AU - Ofer,Naomi, AU - Dalit,Vaizel-Ohayon, AU - Aharoni,Avi, AU - Revhun,Menahem, AU - Nitzan,Yeshayahu, AU - Nasser,Abidelfatah M, PY - 2015/8/25/entrez PY - 2015/8/25/pubmed PY - 2016/4/12/medline KW - Cryptosporidium KW - Giardia KW - genotypes KW - removal KW - wastewater treatment KW - water reuse SP - 1265 EP - 73 JF - Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering JO - J Environ Sci Health A Tox Hazard Subst Environ Eng VL - 50 IS - 12 N2 - Wastewater disposal may be a source of environmental contamination by Cryptosporidium and Giardia. This study was conducted to evaluate the prevalence of Cryptosporidium oocysts and Giardia cysts in raw and treated wastewater effluents. A prevalence of 100% was demonstrated for Giardia cysts in raw wastewater, at a concentration range of 10 to 12,225 cysts L(-1), whereas the concentration of Cryptosporidium oocysts in raw wastewater was 4 to 125 oocysts L(-1). The removal of Giardia cysts by secondary and tertiary treatment processes was greater than those observed for Cryptosporidium oocysts and turbidity. Cryptosporidium and Giardia were present in 68.5% and 76% of the tertiary effluent samples, respectively, at an average concentration of 0.93 cysts L(-1) and 9.94 oocysts L(-1). A higher detection limit of Cryptosporidium oocysts in wastewater was observed for nested PCR as compared to immune fluorescent assay (IFA). C. hominis was found to be the dominant genotype in wastewater effluents followed by C. parvum and C. andersoni or C. muris. Giardia was more prevalent than Cryptosporidium in the studied community and treatment processes were more efficient for the removal of Giardia than Cryptosporidium. Zoonotic genotypes of Cryptosporidium were also present in the human community. To assess the public health significance of Cryptosporidium oocysts present in tertiary effluent, viability (infectivity) needs to be assessed. SN - 1532-4117 UR - https://www.unboundmedicine.com/medline/citation/26301853/Cryptosporidium_and_Giardia_removal_by_secondary_and_tertiary_wastewater_treatment_ DB - PRIME DP - Unbound Medicine ER -