Any test reports for pathogens re willow feeder

I see the statement that after 2 years in a closed bin, the poop is going to be pathogen-free. Have people tested this in a lab? If it's so safe, why restrict it to willows or trees, why not use in the vegetable garden as well?

Shayok, I agree that it would be great to see some data from actual units in use.  Although I don't have a Willow Feeder, here is some data I've seen that may help.  The Composting and Dry Desiccating Toilets (Latrines) paper from the Global Water Pathogen Project summarizes some research on the topic and describes the factors that influence pathogen die off.  The World Health Organization Guidelines for the safe use of wastewater, excreta and greywater Volume 1 states in part:

Table 5.2 Recommendations for storage treatment of dry excreta and faecal sludge before use at the household and municipal levels

Treatment	Criteria	Comment
Storage; ambient temperature 2–20 °C	1.5–2 years	Will eliminate bacterial pathogens; regrowth of E. coli and Salmonella may need to be considered if rewetted; will reduce viruses and parasitic protozoa below risk levels. Some soil-borne ova may persist in low numbers.
Storage; ambient temperature >20–35 °C	>1 year	Substantial to total inactivation of viruses, bacteria and protozoa; inactivation of schistosome eggs (<1 month); inactivation of nematode (roundworm) eggs, e.g. hookworm (Ancylostoma/Necator) and whipworm (Trichuris); survival of a certain percentage (10–30%) of Ascaris eggs (≥4 months), whereas a more or less complete inactivation of Ascaris eggs will occur within 1 year.

Thank you very much Burton for those references. I will go through them when I have some time. It seems, though, that neither criterion listed in the table is obtainable in the cold temperate zone. I'm assuming that the time length specified has to be continuous, not merely cumulative.

In the meantime, I also found some literature survey on human waste processing and elimination of pathogens. Here's a paper focused on doing so in tropical conditions.