CENTRIFUGAL SEPARATING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a centrifugal separating device capable of stably maintaining the high solid-liquid separating performance of a centrifugal separator by reinjecting an inorganic coagulant into separated sludge which is coagulated sludge making immediate progress in solid-liquid separation, to cause a quick and efficient reaction between the separated sludge and the inorganic coagulant, thereby further accelerating solid-liquid separation to surely attain the low water content of dewatered sludge and the high concentration of concentrated sludge.SOLUTION: A centrifugal separating device is adapted to supply an inorganic coagulant and a polymer coagulant to sludge and to separate the sludge formed with flocks, into separated matter and separated liquid by a centrifugal separator 1 equipped with an outer body bowl 3 and an inner body screw 4. The centrifugal separating device includes an inorganic coagulant injection pipe 23 disposed at the inner body screw 4 and injecting the inorganic coagulant into a sludge supply chamber 7 provided with a sludge supply port 7a and a coagulant outflow port 7b; an inorganic coagulant discharge hole 23a provided at the inorganic coagulant injection pipe 23; and a water supply pipe 26 connected to the inorganic coagulant injection pipe 23.