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To convert gallons per day to minutes per day to waste <br />(gallons/day to be wasted)/(40 gallons/minute WAS pumping rate) = Minutes to waste <br />Example: <br />Given 680 gpd to waste <br />Given 40 gpm WAS pump rate <br />(680 gallons/day)/(40 gpm) = 17 minutes per day <br />3.6.3g Clarifier Emergency Operations <br />The following occurrences can cause the process to fail resulting in violations of the permit. <br />• Blowers stop working resulting in reduced or lack of aeration. <br />• Excess wasting resulting in not enough "food". <br />• Sludge age is either too young or too old. <br />• Heavy rain storms resulting in dilution of mixed liquor. <br />3.6.3h Secondary Stage Key Notes <br />• Biological systems react slowly to control changes; give the system time to adapt to a <br />change before making another adjustment. <br />• Consistency is key to a successful operation, make few adjustments; and only when <br />necessary. <br />• When bacteria will not settle in the clarifier, excess solids will be lost to the filter. <br />Monitoring the settling characteristics of the bacteria will indicate when a problem is <br />starting to develop. <br />• Making corrections before problems develop is "process control". Waiting until control is <br />lost moves you to trouble shooting and clean-up mode. <br />