TORAY MBR
Instruction Manual
06-G-MB2-NHPAF-220801
40 of 63
(2)
Membrane Scouring Blower
: The blower supplying air for membrane scouring should
be on continuously. Air flow (and suction pump) should be stopped if the liquid level in the
membrane tank falls below the preset low level for a long period or the flow to the
membrane tank stops. In such cases the air supply should be applied for five (5) minutes
each hour the system is not producing filtrate. This is required to keep the sludge well
mixed and in good condition for restarting the filtration process while avoiding too much
stress to the membrane elements.
(3)
Membrane Tank Water Level
: If the liquid level in the membrane tank reaches the low
level, the suction pump and membrane scouring air should be stopped. If the membrane
tank reaches high level the wastewater feed supply should be stopped.
(4)
TMP
: Two TMP alarms should be incorporated into the MBR control logic. A ”HIGH TMP
ALARM” should be activated before the TMP increases 5 kPa from the initial TMP value.
A ”HIGH-HIGH TMP ALARM” which stops filtration should be activated when the TMP
reaches 20 kPa.
(5) Equalizing/balancing wastewater load in terms of both quality and quantity is quite
important for stable operation of MBR. In this regard having equalization tank with mixing
equipment is recommended.
