Survival of microorganisms and helminth eggs in green pills and cobs processed from a green crop irrigated with sewage.

A grass crop which was contaminated with domestic sewage was dried in a hot air drying plant in order to observe the effect of the drying on pathogenic bacteria, virus and parasite eggs. The investigation showed, that pathogenic bacteria and virus were reduced with a factor 10(5)--10(6), and that parasite eggs were reduced with at least a factor 200, which is sufficient to secure that grasis irrigated with sewage and pre-served with hot air drying is used without hygienic risks.