Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1997-03-03
1999-09-28
Walker, W. L.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210137, 210637, 21032165, 210739, 210741, 2104161, 21032169, 210412, B01D 1508
Patent
active
059582430
ABSTRACT:
A membrane filtration system which uses pump speed controllers to control flow rate and pressure during both the filtration cycle and the backwash cycle. The pump speed controllers operate by changing the frequency of AC current delivered to the pump motors, which changes the flow rate by changing the speed of the pump motor. The speed controllers operate by modulating the pump input power frequency in response to a signal from a flow or pressure signal received from a flow or pressure meter located on a liquid input pipe. This pump speed control method avoids the cyclical dampening patterns observed when trying to adjust pressure and/or flow rates by adjusting regulating valves. The system can also reduce or prevent formation of pressure spikes when switching from a filtration cycle to a backwash cycle, and vice versa. This reduces the likelihood of damage to the membrane from hydraulic pressure pulses. Finally, it offers the flexibility to provide pressure and flow pulses throughout the filtration and backwash cycles. These pulses have been found to dislodge foulants from the membrane while improving the net flux across the membrane, resulting in an increase in system productivity.
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Hellenkamp Theo A. A.
Lawrence Darren P.
Alexander Andrew
Cecil Terry K.
Walker W. L.
Zenon Environmental Inc.
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