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By A.H. HAVELAAR

This a hundred thirty web page convention lawsuits includes 15 articles on microorganisms in sewage sludge.

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198–218. , and Langeland, G. (1984): Aerobic, Thermophilic Digestion of Sewage Sludge Using Pure Oxygen. , and Ott, H. ): Processing and Use of Sewage Sludge. Commission of the European Communities, D. Reidel Publishing Company, 107–109. , and Lundar, A. (1984): Hygienisering av slam ved bruk av rent oksygen. Norwegian Institute for Water Research, NIVA-Report no. VA-9/84 Lassen, J. : Rapid Identification of Gram-Negative Rods Using a Three-Tube Method Combined with a Dichotomic Key. Acta Pathologica et Microbiologica Scandinavica, Sect.

Their replication time is conditioned by environmental factors and genetical constitution of the microorganisms. Although environmental factors may be improved, genetic limits remain (6). In nature, organic matter spontaneously undergoes several processes of microbial transformation according to the composition of the substrate and the chemical and physical environment which the microorganisms inhabit. The end-products are completely different depending on whether conditions are aerobic or anaerobic.

Figure 6 Concentration of Salmonella bacteria in raw and composted sewage sludge. With an average of 3 days composting and the use of heat exchanger the test organisms were considerably inactivated if the temperature in both the second and the third chamber were 60–65°C. Sometimes the temperature was too low, howewer, and some faecal coli, and a greater fraction of the faecal streptococci survived. From the results listed in Table I it can be seen that three chambers were necessary to provide a satisfactory decimation of the microorganisms.

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