A series of belt filter press trials were performed to assess BFP technology as a method fordewatering digested biosolids which had been pretreated by the Cambi Thermal HydrolysisProcess (THP). The THP is a sludge pretreatment process which heats raw sludges to hightemperature (150-165 °C ) using steam followed by mesophilic digestion. In this study, twodifferent full scale THP sludges were dewatered on two belt filter presses supplied by twodifferent manufacturers. The digested THP sludges had solids concentrations between about 5-7%. The goal of the project was to evaluate the effect of solids loading rates and polymer dosingon cake solids and capture. The results showed the THP sludges dewatered well using BFPs,with cakes solids of 30% or higher easily achieved along with capture rates greater than 99%.This performance was achieved over a broad solids loading rate with 30% cake solids beingachieved at loading rates of up to 1000 kg/m-hr. The study also showed that mixing of thepolymer and sludge was a critical parameter for achieving good flocculation and dewatering.
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