Impact of heat-treatment on wastewater analytical parameters

Autor: Praveen Rosario, Thamayanthi Seenivasan, Ramya Viswash, Sudha Ramalingam, Viswa Barani, Claire M. Welling, Sonia Grego
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Water Science and Technology, Vol 88, Iss 11, Pp 2931-2939 (2023)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
37499297
DOI: 10.2166/wst.2023.359
Popis: Raw wastewater analysis is an important step in treatment assessment; however, it is associated with risks of personnel exposure to pathogens. Such risks are enhanced during virus outbreaks, such as the COVID pandemic, and heat-treatment is a commonly used mitigation measure. We examined whether heat-treatment compromises wastewater analytical parameters results. We found that heat-treatment of blackwater at 60 °C for 90 min in capped containers yielded no statistically different values (p > 0.05) for pH, chemical oxygen demand (COD), ammonia (NH3), total nitrogen (TN), total suspended solids (TSS), and turbidity for specimens from three different sources. This heat-treatment inactivated coliform bacteria (>4 log10 reduction) thus compromising the measurement of commonly used fecal contamination indicators. The observation of intact helminth eggs in heat-treated specimens suggests that the helminth egg enumeration assay is not compromised. These findings indicate that heat-treatment for the safe handling of wastewater, as may be needed in future virus outbreaks, does not affect the measurements of many common wastewater physico-chemical properties. HIGHLIGHTS Heat-treatment of wastewater was used as a personnel safety measure during the COVID-19 pandemic.; We examined whether heat-treatment compromises wastewater analytical parameters.; Heat-treatment yielded no statistical difference in pH, organics, nitrogen, and solid content values.; Heat-treatment significantly degraded the fecal coliform enumeration results, but helminth egg enumeration may be possible.;
Databáze: Directory of Open Access Journals
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