NIRE-170-1-6
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.
"NHP210 Series" is a new model of "MEMBRAY" equipped with thin membrane elements
having higher packing density, while reliable performance of Toray PVDF membrane has
been kept unchanged. This manual explains MBR's features and describes the specifications
of "NHP210 Series" and its safe operations including installation, operation, maintenance
procedures and peripheral equipment. Operators should thoroughly read this manual to
ensure stable operation.
1. Features of MBR
The process flow of the conventional activated sludge system (CAS) and MBR are shown in
Fig.I-1 and Fig.I-2, respectively.
MBR provides the following advantages:
(1) Small Footprint
Unlike CAS, MBR separates sludge within aeration tank using membranes, thus eliminate
the space for preparing sedimentation tank. Also with membrane, MBR can hold higher
concentration of activated sludge in the aeration tank, so its volume can be reduced. As a
result, MBR provides smaller footprint compared to CAS.
(2) High quality of treated water
MBR removes suspended solid (SS) from the sludge liquid with membrane much more
Sedimentation Tank
Waste
water
Aeration Tank
Discharge
Wastewater
Discharge or Reuse
Reuse
RO
membrane
Submerged Membrane
Module
Membrane
Tank
Fig. I-1 CAS Flow
Fig. I-2 MBR Flow
