Wastewater treatment plants discharges disseminated more Giardia than Cryptosporidium

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2023-02-01

Author

Onursal, Asli
İçgen, Bülent

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Parasitic protozoaGiardia intestinalisandCryptosporidium parvumare causative agents for giardiasis and cryptosporidiosis, respectively. These infections are mostly associated with waterborne diseases. The discharges from wastewater treatment plants (WWTPs) that reach surface waters cause waterborne transmission because there are no regulations for monitoring these protozoa. This emphasizes how crucial the removal capacities of WWTPs to prevent the spread of infectious parasitic pathogens. For this reason, in this study, five different types of WWTPs including conventional activated sludge (CAS), biological nutrient removal (BNR), sequencing batch reactor (SBR), membrane bioreactor (MBR), and WWTP with coagulation–flocculation and UV disinfection (CoFlUV) units were investigated over a year, seasonally in terms of theirG. intestinalisandC. parvumremoval capacities. The seasonal abundances of these protozoa-specific genes in both the influents and effluents of each WWTP were determined by qPCR. The reduction of protozoan rDNA copies in the effluent wastewater samples compared with the influent wastewater samples was assessed as log10reduction values (LRVs). LRVs >3 were reachable forC. parvumin all types of WWTPs tested. However, only LRVs 1–2 were reachable forG. intestinalisin CAS, SBR, CoFlUV, and MBR. Significant seasonal variations were just observed in SBR and CAS forG. intestinalisandC. parvum(p < 0.05), respectively. The findings depicted that WWTPs tested disseminated more giardiasis causative agents than cryptosporidiosis. Therefore,G. intestinalisneeds to be monitored in WWTPs' discharges to reduce any potential damage of this parasite to public health.

URI

https://onlinelibrary.wiley.com/doi/full/10.1002/wer.10839
https://hdl.handle.net/11511/102396

Journal

WATER ENVIRONMENT RESEARCH

DOI

https://doi.org/10.1002/wer.10839

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Department of Environmental Engineering, Article

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Citation Formats

A. Onursal and B. İçgen, “Wastewater treatment plants discharges disseminated more Giardia than Cryptosporidium,” WATER ENVIRONMENT RESEARCH, vol. 95, no. 2, pp. 10839–10839, 2023, Accessed: 00, 2023. [Online]. Available: https://onlinelibrary.wiley.com/doi/full/10.1002/wer.10839.