Powder activated carbon circulation type membrane treatment method and apparatus

摘要

PPROBLEM TO BE SOLVED: To provide a powdery activated carbon circulation type membrane treatment method and equipment in which the rate of recovery of water in membrane separation is increased, blocking of separating membranes by high molecular organic matter is suppressed while increasing the amount of organisms in a treatment tank and good treated water quality can be obtained in a stable state. PSOLUTION: In the powdery activated carbon circulation type membrane treatment method in which powdery activated carbon is put in raw water to be biologically treated with microorganisms, solid-liquid separation with a separating membrane is carried out, water passed through the separating membrane is drawn as treated water and microoganisms and powdery activated carbon concentrated without passing through the separating membrane are circulated to raw water, solid-liquid separation is carried out with a second separating membrane 12 having a pore size larger than that of the above separating membrane (first separating membrane 11) and insufficient to pass microogaisms and powdery activated carbon in raw water in addition to the first separating membrane 11 and water passed through the second separating membrane is discharged into the outside of the circulation system through a drain channel 28. PCOPYRIGHT: (C)2003,JPO