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Sewage sludge is a concentrate of pathogenic agents which survived the sewage purification processes. Such hazardous sludges therefore should be disinfected prior to their utilization in agriculture. Necessary technologies for each size of treatment plant are on the market available. The new ordinance for the agricultural utilization of sewage sludge which comes into force the 1 April 1983 meets to a large extent the expectations of hygienists.
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