"j.e. cummins" wrote:
> 17 February 2000
> Prof. Joe Cummins
> e-mail: jcummins@julian.uwo.ca
> “What does it take to kill E. coli 0157:H7”
> Recently well healed crazies have begun to claim that organic agriculture is
> hazardous because composted manure contains shiga toxin containing E coli
> 0157:H7. Shiga toxin destroys the kidney. Studies on constructed wetlands
> have been done to follow the fate of toxic E coli and Salmonella. The
> studies are posted on the net:
> http://www.ag.auburn.edu/aaes/information/highlights/spring98/ecoli.html
> Results from the study: “Decline of E. coli 0157:H7 and S. typhimurium in
> Waste Water
>
> These results indicate that, to
> eliminate both pathogens, the wastewater should be stored in
> lagoons and/or treated in the wetlands
> for a combined period of 20 days. Any combination
> of treatment schemes that results in a
> total of 20 days of treatment would be satisfactory to
> eliminate both bacteria, e.g. primary
> lagoon eight days, secondary lagoon five days,
> detention pond two days, and recycle
> pond five days. There is a considerable margin of
> safety that the treated water from the
> liquid swine manure treatment system will be safe
> from E. coli 0157:H7 and Salmonella.
> Therefore the lagoon/wetland-treated wastewater
> can be recycled and used for cleaning
> livestock facilities or the water can be applied to land
> without the risk of spreading enteric
> infection to animals or humans.”
> Wastewater treatment is considerably slower at destroying toxic bacteria
> than is composting. In organic agriculture manure is composted for from
> several months to one or more years. The basis for the claim that composted
> manure contains toxic bacteria is outlandish.
>
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