Decay of enteric microorganisms in biosolids-amended soil under wheat (Triticum aestivum) cultivation
| Autor: | Simon Toze, J. P. S. Sidhu, Karen Schwarz, Deborah Pritchard, Yutao Li |
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| Rok vydání: | 2014 |
| Předmět: |
Time Factors
Environmental Engineering Biosolids Amendment complex mixtures Soil Escherichia coli Fertilizers Weather Waste Management and Disposal Water content Soil Microbiology Triticum Levivirus Water Science and Technology Civil and Structural Engineering Topsoil Microbial Viability Adenoviruses Human Ecological Modeling Salmonella enterica food and beverages Soil classification Soil type Pollution Arid Agronomy Soil water Environmental science |
| Zdroj: | ResearcherID |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2014.03.037 |
| Popis: | There is a growing need for better assessment of health risks associated with land-applied biosolids. This study investigated in-situ decay of seeded human adenovirus (HAdV), Salmonella enterica, Escherichia coli, and bacteriophage (MS2) in biosolids-amended soil under wheat cultivation. The biosolids seeded with microorganisms were placed in decay chambers which were then placed in the topsoil (10 cm depth) at three different sites. Sites were selected in arid wheat-growing regions of Australia with loamy-sand soil type (Western Australia) and sandy soil (South Australia). Seeded E. coli and S. enterica had a relatively short decay time (T90 = 4-56 days) in biosolids-amended soil compared to un-amended soil (T90 = 8-83 days). The decreasing soil moisture over the wheat-growing season significantly (P 0.05) influenced survival time of both bacteria and MS2 at Western Australia (Moora) and South Australia (Mt Compass) sites, particularly in the un-amended soils. Increasing soil temperature also significantly (P 0.05) influenced the decay of MS2 at these sites. In this study, no notable decline in HAdV numbers (PCR detectable units) was observed in both biosolids-amended and the un-amended soils at all three sites. The HAdV decay time (T90 ≥ 180 days) in biosolids-amended and un-amended soils was significantly higher than MS2 (T90 = 22-108 days). The results of this study suggest that adenovirus could survive for a longer period of time (180 days) during the winter in biosolids-amended soil. The stability of adenovirus suggests that consideration towards biosolids amendment frequency, time, rates and appropriate withholding periods are necessary for risk mitigation. |
| Databáze: | OpenAIRE |
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