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Primary Treatment Procedures
Primary Treatment - Primary Clarifiers. Primary Sludge Pumps, and Primary Scum Pumps
Process Flow Diagrams Process Plan and Section Drawings
Plant Schematic Primary Clarifier 1 Drawings 
Primary Clarifiers and Sludge Pumping PID Primary Clarifier 2 Drawings 
Primary Clarifier Foul Air Collection   Sludge Pump Drawings 
Primary Clarifiers
Pre-Startup Checks 
  1. Inspect the clarifier and remove any ladders, tools, or debris.
  2. Check oil levels in drive gearboxes.
  3. Verify all components have power.
  4. Start the collector drive by turning the ON/OFF switch to the ON position.
  5. Check that there is no binding of moving parts.
  6. Check shear pin and/or alarm mechanism for proper operation.
  7. Check for drive unit oil leaks.
  8. Stop collector drive.
  9. Do not operate if any of the checks listed above are unsatisfactory, and then notify supervisory staff.  
  10. Verify the primary sludge pump pressure switches are functional.  
  11. Verify the primary scum and sludge pumps are functional.
  12. Verify scum trough and scum wet well isolation valves are functional.
  13. Verify primary scum and sludge pump discharge valves are configured so solids go to the digester as required.
  14. Follow all applicable safety rules, practices, and procedures.
Place Unit Into Service
  1. Open the clarifier inlet gate.
  2. Place the clarifier drive ON/OFF switch into the ON position.
  3. Periodically monitor the level as it rises in the clarifier.
Take Unit Out of Service
  1. Configure remaining clarifier to handle all flow.
  2. Close clarifier inlet gate.
  3. Pump all solids out of the clarifier.
  4. Open tank drain or begin pumping down while hosing down clarifier walls, weirs, etc.
  5. Pump out and hose down scum wet well.   
  6. Place collector ON/OFF switch in Off.
  7. Lock out all components.
Primary Clarifier Sludge/Scum Pumps
Pre-Startup Checks 
  1. Inspect the scum trough and scum wet well and remove debris.
  2. Verify all components have power.
  3. Verify the pump pressure switches are functional.
  4. Verify pump inlet piping is configured for proper solids source as desired.
  5. Verify the primary clarifier scum and sludge pump discharge valves are configured to go to the digester as required.
  6. Follow all applicable safety rules, practices, and procedures.
Place Unit Into Service
  1. Open the suction and discharge isolation valves.
  2. At the local control panel turn the Hand/Off/Auto switch to Auto.
  3. Enter the start times and pumping duration times on SCADA.
  4. At required time monitor one pump cycle for each pump in operation.
Take Unit Out of Service
  1. Place the local Hand/Off/Auto switch in the off position.
  2. Close the intake and discharge isolation valves.
  3. Lock out and tag out equipment if it is going to be worked on.

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Last Updated: 9/16/2013 9:10:38 AM
Version 4.0.1