What question did this study set out to answer?

To evaluate the effect of evaporative dewatering on the inactivation rates and physical integrity of enteric viruses in wastewater sludge.

Inactivation of enteric viruses in wastewater sludge through dewatering by evaporation

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Population

Enteric viruses (poliovirus, coxsackievirus, and reovirus) seeded in raw wastewater sludge and distilled water

Design

Preclinical

Authors

Evaporation dewatering may lower enteric virus risk in sludge; leaves open validation in full-scale wastewater systems.

To evaluate the effect of evaporative dewatering on the inactivation rates and physical integrity of enteric viruses in wastewater sludge.
Raw sludge seeded with poliovirus, coxsackievirus, or reovirus was dewatered through evaporation at 21 °C.
Viral infectivity was tracked by measuring plaque-forming units as solids content increased, with parallel controls conducted in distilled water.
Mechanism of inactivation was investigated by assessing the release and degradation of viral RNA molecules.
Poliovirus infectivity gradually declined until solids content reached approximately 65%, followed by a steep decrease of greater than three orders of magnitude between 65% and 83% solids.
Viral inactivation was irreversible and driven by structural disruption, resulting in the release and extensive degradation of viral RNA.
Coxsackievirus and reovirus showed comparable inactivation kinetics under identical evaporative conditions.

Population

Enteric viruses (poliovirus, coxsackievirus, and reovirus) seeded in raw wastewater sludge and distilled water

Intervention

Dewatering by evaporation at 21 degrees C

Outcome

Loss of viral plaque-forming units (inactivation rate)

Dewatering by evaporation effectively inactivates enteric viruses in wastewater sludge, suggesting it as a feasible method for viral inactivation.

Ward et al. (1977) studied this question.

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