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GPS-X Technical Reference

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Attached Growth Models 246<br />

Figure 7-18 - BAF Operational Parameters<br />

The entry under the Cycles heading, backwash operation, is used to set up the method<br />

by which a backwash operation will be initiated when operating the filter(s). The<br />

backwash operation can be time-based, head loss-based, effluent quality based, or<br />

manual. The filter can be operated in single unit mode (the whole volume will be in<br />

filter, backwash, standby or flushed mode), or multiple unit operation. In multiple unit<br />

operation (if the number of units is greater than one), the number of units in filter<br />

mode can be specified, and the remaining units are in standby mode. The number of<br />

simultaneously backwashed units will be taken out of the filtration mode and replaced<br />

with standby units when a backwash operation is initiated if the constant filter loading<br />

rate controller is on. The target loading rate on the filter fraction can be specified and<br />

thus the volume of filter in filtration mode will vary to maintain the target loading rate.<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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