Decay of enteric microorganisms in biosolids-amended soil under wheat (Triticum aestivum) cultivation

Schwarz, K. R., Sidhu, J. P. S., Pritchard, D. L., Li, Y. and Toze, S. (2014) Decay of enteric microorganisms in biosolids-amended soil under wheat (Triticum aestivum) cultivation. Water Research, 59 185-197. doi:10.1016/j.watres.2014.03.037

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Author Schwarz, K. R.
Sidhu, J. P. S.
Pritchard, D. L.
Li, Y.
Toze, S.
Title Decay of enteric microorganisms in biosolids-amended soil under wheat (Triticum aestivum) cultivation
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2014-08-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.03.037
Open Access Status Not yet assessed
Volume 59
Start page 185
End page 197
Total pages 13
Place of publication Oxford, United Kingdom
Publisher Elsevier Ltd
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
Abstract 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 (10cm 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.
Keyword Biosolids amended soil
Human adenovirus
Pathogen decay
Salmonella enterica
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Public Health Publications
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