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The importance of the ecological exploitation of the treated sludge consists in the fact that it is generated in the treatment plants 365 days from 365, 24 hours from 24, but unfortunately the sludge exploitation is limited nowadays, no matter the chosen option. Practically there are no standard solutions, all the research options, respectively the exploitation of the sludge require costs and cooperation with the thirds, plus the sludge quality must conform to certain values imposed by law. The difficulty elements...