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A. DAILY OPERATING PROCEDURE <br /> All these duties can be performed within a 60-minute period. <br /> 1. Mixed liquor 60-minute settling test (1000-m1 sample): <br /> '- a. Record settling results every 5 minutes for 30 minutes. <br /> b. Record settling results every 10 minutes for next 30 minutes. <br /> ` Record the increments on the settling graph. <br /> During the 60-minute period, observe any changes with the sludge and record these <br /> changes in the daily log of the plant. If any sludge is observed rising to the top of the <br /> �.. sample cone, record the exact time of observation on the settling graph. Rising <br /> sludge (called bulking) is usually an indicator of a nitrifying condition. This condition <br /> ' may indicate an oxygen starvation problem within the aeration chamber. If bulking is <br /> 16- observed, a dissolved oxygen test on a fresh sample of mixed liquor is required to <br /> determine if aerator adjustment is required. <br /> 2. Filter backwashing (if applicable): <br /> a. Ten-minute backwash cycle. This may be done during a 10-minute period of the <br /> second 30 minutes of the settling test. <br /> 3. Chlorine feed supply check (if applicable): <br /> a. This can be done during the 10-minute backwash cycle. <br /> 4. Ultraviolet light cleaning (if applicable): <br /> a. Pull the wiper(s), a 30-second daily requirement. <br /> 5. Freshwater rinse (if required): <br /> a. Clarifier <br /> b. Chlorine contact chamber <br /> c. Aeration chamber <br /> 60 minutes complete. <br /> GENERAL OBSERVATIONS <br /> The sewage system processes treated sewage in batches through several sequences. In <br /> order to assist a new operator in recognizing normal operating conditions, a field checklist <br /> outlining these conditions is included in the operations manual. <br /> By observing the liquid level in the three basic chambers (not including the filters), it is <br /> easy to recognize the phase of the operating cycle in the process controller (PC). Periodi- <br /> cally, in order to determine that the equipment is operating correctly, the operator should <br /> L- observe the sequence of operations through an entire processing cycle. <br /> The settling time totalizer (optional), if recording time, is the obvious indicator that the <br /> settling time program (STP) is operational and where the cycle is in the batch phase. <br /> B. MANUAL OPERATION PROCEDURE <br /> In order to observe operation when the system is in standby, either add water to raise the <br /> `^ liquid level in the aeration chamber or control the cycle manually. If it is desired to check <br /> v only pump performance, each pump can be started in sequence by manual switch <br /> override. <br /> 1 <br />