Abstract:Pathogen removal in sludge treatment is an important step. Several Class A processes that utilize thermal treatment to achieve pathogen reduction have observed large increases in indicator bacteria, namely fecal coliform or E. coli, after centrifuge dewatering. In many cases, the densities before dewatering were below the detection limit. One hypothesis to explain this observation is that the bacteria were poorly enumerated after the thermophilic processes, but some were still viable and were able to be recove… Show more
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