[Survival of Salmonella typhimurium in the solid fraction from a farm waste water treatment plant].

Survival of Salmonella typhimurium pathogens was followed in the slurry solid fraction from a pig farm waste water treatment plant. The tested S. typhimurium pathogens have survived for 117 days.

[Use of hydrated lime for disinfection of sewage sludge containing Salmonella typhimurium and Ascaris suum as model pathogens].

Hydrated lime was lethal to the strain of Salmonella typhimurium (Sk 14/39) after 60 min of exposure. In the control without addition of hydrated lime this strain was still viable after 168 hours, counting 6.1 x 10(5) pathogens/l ml sludge.

Survival of model bacterial strains and helminth eggs in the course of mesophilic anaerobic digestion of pig slurry.

The effect of methanogenesis on the survival of model bacterial strains (Escherichia coli EC 5, Staphylococcus aureus SA 11, Enterococcus faecium CCM 4231) and non-embryonated helminth eggs (Ascaris suum) was investigated in pig slurry. Two pilot-plant experiments were carried out in two anaerobic digesters (800 and 1,000 litre) in a mesophilic thermal range (35-37 degrees C). The mean hydraulic retention time of the digesters was 20 days.

Use of a polyurethane carrier for assessing the survival of helminth eggs in liquid biological sludges.

Soft expanded polyurethane (plastic foam) was used as an egg carrier. A carrier of helminth eggs and a method for their isolation were tested. They proved applicable to evaluation of the survival of helminth eggs in liquid biological substrates (sludges, liquid excrements).

[The importance of flies (Diptera-Brachycera) in the dissemination of helminth eggs from sewage treatment plants].

Screenings were carried out in four mechanico-biological municipal wastewater treatment plants in two climatico-geographic regions of Slovakia (submontane region: Levoca, Poprad and Tatranská Lomnica, lowland region: Michalovce). Ovoscopical studies traced the occurrence of helminth eggs in stabilized sludges in sludge beds. The flies (Diptera-Brachycera) are considered as potential biological vectors of helminth eggs.