| Autor: |
Faria, Marianne F., Guerrini, Iraê A., Oliveira, Fernando C., Sato, Maria Inês Z., Hachich, Elayse M., Passos, José Raimundo S., Goulart, Lívia M. L., Silva, Thiago T. de S., Gava, José L., Furches, Joel C., James, Jason, Harrison, Robert B. |
| Zdroj: |
Journal of Environmental Quality; May 2017, Vol. 46 Issue: 3 p522-527, 6p |
| Abstrakt: |
In many countries, the main reason for severely restricting or outright banning the land application of class B biosolids is the lack of risk assessment for adverse human health impacts. Among pathogens that are not often studied are helminth ova, including that of the Ascarisspp. Almost all of the knowledge about the persistence of Ascarisspp. ova in soils fertilized with biosolids is based on studies developed in North America, Europe, and Asia. These studies have almost always been conducted under temperate climate conditions, which may cause erroneous interpretations when the conclusions are extrapolated to tropical regions such as those found in Brazil. This team evaluated the persistence of viable Ascarisspp. ova in a sandy Quartzipsamment tropical soil, previously planted with Eucalyptus urophylla× Eucalyptus grandishybrid (Eucalyptus urograndis) and fertilized with biosolids, over a 52‐wk period. During the reporting period, the average temperature of soil and biosolids fluctuated between 15 and 30°C, and the average moisture of biosolids fluctuated between 60 and 90%. The estimated persistence time of viable Ascarisspp. ova after land application was estimated at close to 7 wk, indicating that ova may not be viable for as long as it has been shown to be in studies of more temperate areas. The relationship of temperature with persistence of viable Ascarisspp. ova in a tropical soil was stronger than moisture content, suggesting that temperature substantially contributed to their nonviability over the course of the experiment. Climate conditions, mainly temperature, influence the viability of Ascarisspp. ova.Viable Ascarisspp. ova were not found after 7 wk of study in tropical soil.Agricultural use may be the best practice for disposal of biosolids. |
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