18
98-0157 Rev P
Reject to Tank:
Concentrate and permeate water will recirculate to the feed water break tank until the permeate
quality reaches the HI RECOVERY QUALITY HIGH LIMIT or BREAK TANK TEMPERATURE HIGH LIMIT
set-points. When these set-points are reached the reject to drain period will begin and the RO will
dump the reject water to drain. During times of low water usage in the RO distribution loop, the feed
water quality in the break tank will remain close to incoming water quality. See Section 6.4.1 for
more information.
Figure 4
Figure 5
Figure 6
Concentrate to Drain Valve
Loop Return Valve
Product to Loop Valve
Reject to Drain:
Reject water is dumped to the drain until the permeate
quality reaches the HI RECOVERY QUALITY LOW LIMIT or
BREAK TANK TEMPERATURE LOW LIMIT set-point. Valve
position will remain the same for Loop Return and Product
to Loop Valves. The Concentrate to Drain Valve will rotate
as shown in Figure 7.
Figure 7
Concentrate to Drain Valve
4.2.3
Standard Recovery Mode
Standard Recovery Mode is also comprised of Flush, Rinse, and Supply mode. Flush and Rinse
operations remain the same, see Figure 1 through Figure 3. However, when operating in Standard
Recovery Mode, there is no Reject to Tank step of Supply. There will be more water usage due to less
water being recovered during this period. See Figure 4 through Figure 6 for valve positioning.
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