AIRE-064-1-4
1
I. Introduction
TORAY "MEMBRAY" is the submerged membrane module suitable for the membrane
bioreactor (MBR) that has been developed based on the polymer science and the membrane
fabrication technologies accumulated for a long time in Toray Industries, Inc.
"TMR140 Series" is a standard model of "MEMBRAY". This manual explains MBR's features
and describes the specifications of "TMR140 Series" and its safe operations including
installation, operation, maintenance procedures and peripheral equipments. Operators
should thoroughly read this manual to ensure stable operation.
1. Features of MBR
The process flow of the conventional activated sludge method (ASM) and MBR are shown in
Fig.I-1 and Fig.I-2, respectively. Unlike ASM, which employs the sedimentation tank, MBR
separates sludge with membranes. MBR provide the following advantages:
(1) Small
Footprint
In the case of MBR, the biological treatment can be operated at higher MLSS, so the
aeration tank is reduced. And MBR does not need a sedimentation tank. As a result, MBR
provides smaller footprint of the plant.
(2) High quality of treated water
MBR removes suspended solid (SS) from the sludge liquid with membrane much more
certainly than conventional sedimentation process. MBR also rejects microorganisms such
as
Escherichia coli
and
Cryptosporidium
efficiently.
Sedimentation tank
Waste
water
Aeration Tank
Discharge
Waste
water
Discharge or Reuse
Reuse
RO
membrane
Submerged membrane
module
Membrane
Submerged
Tank
Fig. I-1 ASM Flow
Fig. I-2 MBR Flow
