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An examination of the rheological properties of activated sludges from three sewage treatment works and a digested sludge from a dual mesophilic-thermophilic anaerobic digester (TAD-MAD) showed that all the sludges exhibited yield stresses the magnitude of which varied with the suspended solids' concentration and the type of treatment which they had received. In particular, the TAD-MAD sludge had...
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