期刊名称：Annals of Agricultural and Environmental Medicine
印刷版ISSN：1232-1966
电子版ISSN：1898-2263
出版年度：2013
卷号：20
期号：1
页码：8-12
出版社：Institute of Agricultural Medicine in Lublin
摘要：The agricultural use of sewage sludge is possible on condition of maintaining microbiological and parasitological standards, and one of the most modern methods improving its sanitary state is solar drying. In the presented study, the effect of this process on the elimination of indicator microorganisms (Escherichia coli, Salmonella Senf tenberg W775, Enterococcus spp.) and eggs of Ascaris suum introduced into the biomass of sludge was examined. The experiment was carried out in the spring period with a maximal temperature of 18 °C inside the drying plant. Bacteria and parasite eggs were introduced into special carriers (cylinders filled with sewage sludge) and placed at selec ted points of the drier. The carriers were removed every 7 days and subject to a research procedure in order to estimate the number of bac teria and percentage of live eggs of Ascaris suum. Sanitization of the material was not obtained, since af ter 28 days of the process the final product contained a large concentration of Enterococcus spp. and S. Senftenberg W775 (105-109MPNg-1). Only the number of E. coli decreased by 6 log. During the process, the fastest decrease in the number of bac teria was observed in E. coli (ca 0.2 log/day), slower in enterococci (0.02-0.081 log/day), and the slowest in bacilli of the genus Salmonella (0.011-0.061 log/day). Sludge after drying also still contained 57-66% of live eggs of A. suum. The study proved that the solar drying of sludge in the spring period results in a product which poses a hazard for public and animal health and environmental sustainability, and should not be used as a fertilizer
关键词：sewage sludge; solar drying; sanitization; bac teria; Ascaris suum
