Inactivation of enteric viruses in wastewater sludge through dewatering by evaporation.
AUTOR(ES)
Ward, R L
RESUMO
The effect of dewatering on the inactivation rates of enteric viruses in sludge was determined. For this study, water was evaporated from seeded raw sludge at 21 degrees C, and the loss of viral plaque-forming units was measured. Initial results with poliovirus showed that recoverable infectivity gradually decreased with the loss of water until the solids content reached about 65%. When the solids content was increased from 65 to 83%, a further, more dramatic decrease in virus titer of greater than three orders of magnitude was observed. This loss of infectivity was due to irreversible inactivation of poliovirus because viral particles were found to have released their RNA molecules which were extensively degraded. Viral inactivation in these experiments may have been at least partially caused by the evaporation process itself because similar effects on poliovirus particles were observed in distilled water after only partial loss of water by evaporation. Coxsackievirus and reovirus were also found to be inactivated in sludge under comparable conditions, which suggests that dewatering by evaporation may be a feasible method of inactivating all enteric viruses in sludge.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=242701Documentos Relacionados
- Heat inactivation of enteric viruses in dewatered wastewater sludge.
- Response of bacteria in wastewater sludge to moisture loss by evaporation and effect of moisture content on bacterial inactivation by ionizing radiation.
- Reduction of interfering cytotoxicity associated with wastewater sludge concentrates assayed for indigenous enteric viruses.
- Heat inactivation of poliovirus in wastewater sludge.
- Detection of enteric viruses in activated sludge by feasible concentration methods