Abstract
The decanter, which can accommodate high feed solid concentration, is applicable for separation, concentration, clarification, classification, and dewatering of biosolids. The machine offers unique advantage for high-mass throughput separation and dewatering application with continuous feed and continuous discharge of centrate and concentrate/cake. Nominal operating G-force is between 2500g and 4000g depending on the process and centrifuge size. Coagulation and flocculation are used in processing enzyme and biological waste stream. Feed rate and bowl speed are the key variables to operate. The pool depth adjustment by centripetal pump or by weir change and the differential speed adjustment are two additional variables that affect centrifuge performance. By monitoring the torque, which indicates cake dryness, and making proper compensation on the differential speed by the back-drive and pool level, high cake solids can be obtained. Various process issues on separation and dewatering can be overcome by operation and design of decanter. These have been discussed in this chapter.
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