Summary
Sanitation of sewage sludge may be obtained by different processes like pasteurization, radiation and composting. In order to ascertain that the end-product has been sufficiently treated, microbiological monitoring may be used. A discussion is given of the suitability of various, commonly used indicator groups for this purpose.
The resistance against heat and radiation of enterobacteria and subgroups thereof (total and thermotolerant coliforms) is too low to provide an adequate margin of safety. Faecal streptococci appear to be useful for monitoring all types of sanitation discussed, and possibly also coliphages are well suited. Bacterial endospores generally are too resistant, so that neither spore-counts nor total counts will give information about the process conditions applied. In the composting process, special problems arise due to the regrowth of certain indicator-bacteria.
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© 1981 ECSC, EEC, EAEC, Brussels and Luxembourg
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Havelaar, A.H. (1981). Monitoring Sewage Sludge Sanitation by Bacterial Indicators. In: L’Hermite, P., Ott, H. (eds) Characterization, Treatment and Use of Sewage Sludge. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8506-3_32
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DOI: https://doi.org/10.1007/978-94-009-8506-3_32
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