This work focuses on the removal of SARS-CoV-2 RNA in the various stages of a full-scale municipal WWTP characterised by two biological processes in parallel: (i) conventional activated sludge (CAS) and (ii) membrane bioreactor (MBR). The monitoring was carried out during the Omicron wave in 2022, a period characterised by a high concentration of SARS-CoV-2 in influent wastewater. The average concentration of SARS-CoV-2 in influent wastewater was 3.7 × 10^4 GU/L. In the primary sedimentation, the removal of SARS-CoV-2 was not appreciable. The largest log removal value of SARs-CoV-2 occurred in the biological stages, with 1.8 ± 0.9 and 2.2 ± 0.7 logs in CAS and MBR systems. The mean concentrations of SARS-CoV-2 in the CAS and MBR effluents were 6.8 × 10^2 GU/L and 6.4 × 10^2 GU/L, respectively. The MBR effluent showed more negative samples, because small particles are retained by membrane and cake layer. The analysis of the different types of sludge confirmed the accumulation of SARS-CoV-2 in primary (5.2 × 10^4 GU/L) and secondary sludge (3.5 × 10^4 GU/L), due to the affinity of enveloped viruses towards biosolids. A SARS-CoV-2 concentration in the digested sludge equal to 4.8 × 10^4 GU/L denotes a negligible reduction in the mesophilic anaerobic digester at temperature of 31-33 °C.

SARS-CoV-2 removal in municipal wastewater treatment plants: Focus on conventional activated sludge, membrane bioreactor and anaerobic digestion / Cutrupi, Francesca; Cadonna, Maria; Postinghel, Mattia; Foladori, Paola. - In: SCIENCE OF THE TOTAL ENVIRONMENT. - ISSN 1879-1026. - ELETTRONICO. - 906:(2024), pp. 1674341-1674349. [10.1016/j.scitotenv.2023.167434]

SARS-CoV-2 removal in municipal wastewater treatment plants: Focus on conventional activated sludge, membrane bioreactor and anaerobic digestion

Cutrupi, Francesca;Foladori, Paola
2024-01-01

Abstract

This work focuses on the removal of SARS-CoV-2 RNA in the various stages of a full-scale municipal WWTP characterised by two biological processes in parallel: (i) conventional activated sludge (CAS) and (ii) membrane bioreactor (MBR). The monitoring was carried out during the Omicron wave in 2022, a period characterised by a high concentration of SARS-CoV-2 in influent wastewater. The average concentration of SARS-CoV-2 in influent wastewater was 3.7 × 10^4 GU/L. In the primary sedimentation, the removal of SARS-CoV-2 was not appreciable. The largest log removal value of SARs-CoV-2 occurred in the biological stages, with 1.8 ± 0.9 and 2.2 ± 0.7 logs in CAS and MBR systems. The mean concentrations of SARS-CoV-2 in the CAS and MBR effluents were 6.8 × 10^2 GU/L and 6.4 × 10^2 GU/L, respectively. The MBR effluent showed more negative samples, because small particles are retained by membrane and cake layer. The analysis of the different types of sludge confirmed the accumulation of SARS-CoV-2 in primary (5.2 × 10^4 GU/L) and secondary sludge (3.5 × 10^4 GU/L), due to the affinity of enveloped viruses towards biosolids. A SARS-CoV-2 concentration in the digested sludge equal to 4.8 × 10^4 GU/L denotes a negligible reduction in the mesophilic anaerobic digester at temperature of 31-33 °C.
2024
Cutrupi, Francesca; Cadonna, Maria; Postinghel, Mattia; Foladori, Paola
SARS-CoV-2 removal in municipal wastewater treatment plants: Focus on conventional activated sludge, membrane bioreactor and anaerobic digestion / Cutrupi, Francesca; Cadonna, Maria; Postinghel, Mattia; Foladori, Paola. - In: SCIENCE OF THE TOTAL ENVIRONMENT. - ISSN 1879-1026. - ELETTRONICO. - 906:(2024), pp. 1674341-1674349. [10.1016/j.scitotenv.2023.167434]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/393929
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