GORMAN-RUPP VG3B3-B, Инструкция по установке, эксплуатации и обслуживанию

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Aqua UltraFiltration™ Membrane System Control Strategy
ID #107150D Page 4 of 37 Revision: 1
Augusta Correctional Center WWTP
© 2013 Aqua-Aerobic Systems, Inc.
a. Coagulant Feed Pump (P1301)
The coagulant feed pump turns on anytime at least one of the membrane feed pumps is
operating. The pump speed is automatically adjusted in proportion to the total UF feed flow.
The Operator shall determine the proper dosage rate (typically 1 – 5 mg/l as Al or Fe) and
make the adjustments at the pump via the calibration.
b. Membrane Feed Pumps (P4101, P4201)
The membrane feed pumps are designed to draw water from the Feed Tank (T2001) and
provide flow to the membranes at a maximum pressure of 1.5 bar (22 psig). The speed of
each pump is automatically adjusted to maintain a level in the feed tank and to balance the
flow through each train based upon a flow signal from the Feed Flow Transmitter (FT4x01).
In order to avoid water hammer, close attention is required to the ramp up/down setpoints for
the membrane Feed Pump and the proper valve sequencing downstream of the pump.
c. Membrane Trains (Train #1, 2)
The membrane trains each consist of (16) Aqua MultiBore™ membrane modules. These are
equipped with upper and lower feed connections which are hydraulically connected to the
inside of the membrane fibers. Each of these connections serves two functions: 1) supply of
feed water to the module, and 2) return of backwash waste to the drain.
The module is also equipped with a single filtrate connection (located just below the top feed
connection). This port also serves several functions, including: 1) discharge of filtered water,
and 2) input for filtered water to serve as the source for backwash.
From a control perspective, eache train undergoes a series of operational modes including:
1. Filtration
2. Backwash
3. Chemically Enhanced Backwash
These modes are described in more depth later in the document.
The control system monitors the train Feed Top Pressure (PT4x02), the Feed Bottom
Pressure (PT4x03), and the Permeate Pressure (PT4x01). These instruments are used to
calculate the trans-membrane pressure (TMP) across the membrane. The Feed pH probe
with temperature compensation (AE2001, TE2001) is used to monitor feed pH as well as
rapid changes in temperature (which can damage the membranes), and the control system
uses this temperature to calculate normalized permeability.
d. Backwash Pumps (P6001, P6002, P6003)
The membrane backwash pumps are designed to draw water from the Backwash (Permeate)
Tank (T6001) and provide flow to a train at a maximum pressure of 3.0 bar (44 psig). The
speed of each pump is automatically adjusted to maintain the flow through the train based
upon a flow signal from the Backwash Flow Transmitter (FT6001).
In order to avoid water hammer, close attention is required to the ramp up/down setpoints for
the membrane Backwash Pump and the proper valve sequencing downstream of the pump.