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Martin Hansen

Redistribution and persistence of microorganisms and steroid hormones after soil-injection of swine slurry

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Mostofa Amin, Danmark
  • Tina B. Bech, Københavns Universitet, Danmark
  • Anita Forslund, Sektion, Food Safety and Zoonoses, Danmark
  • Martin Hansen
  • Søren O Petersen
  • Mette Lægdsmand, Danmark
The redistribution and fate of contaminants in pig slurry after direct injectionwere investigated at two field sites, Silstrup (sandy clay loam) and Estrup (sandy loam), in Denmark. Intact soil samples were collected for up to
seven weeks after slurry injection and concentrations of Salmonella Typhimurium Bacteriophage 28B (phage 28B), Escherichia coli, steroid hormones and other slurry components (water, volatile solids, chloride and mineral N) determined in and around the injection slit. The two experiments at Silstrup and Estrup differed with respect to slurry solid content (6.3 vs. 0.8%), as well as soil clay content (27 vs. 15%) and differed considerably with respect to the initial redistribution of slurry-borne contaminants in soil. The transport of microorganisms from
the slurry injection slit to the surrounding soilwasmuch lower than that of mineralN and chloride due to attachment and entrapment. The redistribution of E. coli was more affected by site-specific conditions compared to phage 28B, possibly due to the larger cell size of E. coli. The overall recovery of phage 28B was 0.8–4%, and of E. coli 0.0–1.3% in different samples, by the end of the study. Nine different steroid hormones were detected in the slurry slit, and a slow redistribution to the surrounding soil was observed. Overall recovery of estrogens
was 0.0 to 6.6% in different samples. The study showed that the combination of soil and slurry properties determined the initial spreading of contaminants, and hence the potential for subsequent leaching.
TidsskriftScience of the Total Environment
Sider (fra-til)1003-1010
Antal sider8
StatusUdgivet - 2014

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