Apparatus and method for concentrating the backwash wastewater membrane filtration

摘要

PPROBLEM TO BE SOLVED: To provide an apparatus and a method for concentrating backwash effluent coming out of a filtration membrane, capable of adjusting the concentration of concentrated sludge to an intended level by mixing compressed dense solid matter of a pellet shape having high settleability contained in the backwash effluent of a membrane filtration device, with sucked and concentrated sludge. PSOLUTION: The apparatus for concentrating backwash effluent coming out of a filtration membrane includes: a membrane filtration device 11 having a casing for receiving raw water therein and a membrane filtration means for filtering raw water by a membrane; a backwash effluent tank 7; a sludge tank 1; a suction-type filtration/concentration means disposed in the sludge tank 1 for producing concentrated sludge by sucking and filtering the backwash effluent present in the sludge tank 1 while discharging filtered water to outside; a backwash-effluent return pipe 6 for returning the backwash effluent in the sludge tank 1 to the backwash effluent tank 7; a concentrated-sludge discharge pipe for discharging the sludge filtered/concentrated by the suction-type filtration/concentration means; and a concentrated sludge tank 15 connected downstream of the sludge tank 1. PCOPYRIGHT: (C)2010,JPO&INPIT