Title

11 Primary Clarifier Normal Operation

Operators routinely check for normal operation of the Primary Clarifier equipment during daily rounds, at least 2 times per 24 hour period. The operator may vary the sequence of inspections.
SOP Identification Number
SOP Identification Number:
1100_NormalOp
Purpose and scope
Purpose and scope:

The number of clarifiers in service will generally depend on flow volume and process conditions.

Health & Safety Warnings
Health & Safety Warnings:
  • Watch for open tanks, vaults and channels when covers are removed.  Install cones at opening if covers are to remain off.
Cautions
Cautions:
Indications of Abnormal Service include:
  • Excessive noise or vibration
  • Oil or process fluid leaks
  • Chain or flight not working
  • Lead pump not working
  • Lead pump not working
  • Excessive floating material
  • SCADA alarms
Potential Interferences
Potential Interferences:
  • Equipment failure may not immediately affect treatment.  Routine inspections to ensure normal operation is critical to maintaiing effective treatment.
Personnel Qualifications
Personnel Qualifications:
  • Operator I, knowledge of primary treatment process and SCADA controls.
Equipment, Supplies, Required Tools
Equipment, Supplies, Required Tools:
  • Valve keys or other tool to open and close valves.
Quality Control/Quality Assurance Activities for the Procedure
Quality Control/Quality Assurance Activities for the Procedure:
  • Record activity to log book.
Procedure
Procedure:
Steps 1 – 3 take place “upstairs” at the Primary Clarifier Deck.
1.    Inspect each Sludge Collector Drive that is in operation:
a.    Check for rotation of the collector drive chain.
b.    Check for rotation of the idler sprocket and engagement with the collector drive chain. 
c.    Look for spilled or leaking oil around and on the drive unit.
d.    Look for excessive vibration and listen for abnormal noise at the collector drive unit. 
 
2.    Inspect each Clarifier that is in operation:
a.    Lift aluminum primary clarifier tank cover. Ensure that flight is moving smoothly.
b.    Look for excessive floating material in the clarifier tank. If present, note if floating material is in clumps or a dispersed accumulation.
c.    Look for the formation of gas bubbles.
d.    Look for floating scum
e.    Look for unusual colors or odors.
f.     Monitor sludge blanket.
g.    Monitor clarifier surface loading.
h.    Replace aluminum clarifier tank cover.
i.      Monitor the distribution of overall flow to all clarifiers that are in service.
j.      Look for solids loss in effluent.
 
3.    Inspect each Scum Collector Drive and Vault that is in operation:
a.    Lift aluminum cover to scum collector roller vault.
b.    Switch operation at the scum collector drive pushbutton switch to HAND control. 
c.    Watch for rotation of collector roller to confirm that unit is in operation.
d.    Check for excessive scum build up.
e.    Check that jaw clutch is engaged to the in-service primary clarifier unit. 
f.     Check that jaw clutch is disengaged from the out-of-service primary clarifier.
g.    Switch operation at the scum collector drive pushbutton switch back to AUTO control.
h.    Replace aluminum cover to scum collector roller vault. 
Steps 4 - 5 take place “downstairs” at Gallery #2.
4.    Inspect sludge piping and valves:
a.    Verify that actuated Rotork valves are in AUTO control. Adjust at the local switch if necessary.
b.    Check for leaks at piping and valves. Primary sludge piping is grey and located above the drain piping. Drain piping is white and located below the primary sludge piping.
c.    Verify open valves to the in-service clarifier tank(s). Each tank is equipped with two valves.
d.    Verify closed valves to the out-of-service clarifier tank(s). Each tank is equipped with two valves.
 
5.    Inspect Primary Sludge Pumps:
a.    Check that lead sludge pump is in-service.
b.    Check that lag sludge pump is out-of-service.
c.    Check for leaks, excessive noise and vibration at the in-service pump.
Step 6 takes place at any available SCADA workstation.
6.    Confirm Remote Control  at SCADA workstation:
a.    Login and go to Primary Sludge Automated Control System screen.
b.    Verify that control indicators correspond correctly to in-service and out-of-service primary sludge collector(s) and primary scum collector(s)
c.    Verify that open/closed valve indicators correspond correctly to in-service and out-of-service primary clarifiers.
d.    Verify that lead and lag pump control indicators correspond correctly to in-service and out-of-service pumps.
Step 7 takes place in the Operator’s Office
7.    Record Data to Operator’s Log Book: Record primary clarifier shutdown activities to the log book with other entries for the day. Include the following in the entry:
a.    Operator(s) that performed the Clarifier Normal Operation SOP.
b.    Which clarifier(s) is in service.
c.    Note conditions of clarifier, sludge collector drive and mechanism, and scum collector drive in service.
d.    Note conditions of the actuated valves, sludge piping, and primary sludge pumps.
e.    Note the approximate time that the SOP was completed.
f.     Note any unusual conditions with flows, levels, odors or other process issues.
g.    Note any damage, wear, or required maintenance on equipment.
Data & Records Management, Calculations, Forms, Reports
Data & Records Management, Calculations, Forms, Reports:
  • Update log book.
  • Update maintenance records (if applicable).
  • Report any maintenance of attention that is required.
  • Collect and analyze samples, if necessary.
Limits/Criteria for Data/Results
Limits/Criteria for Data/Results:
  • Consistent treatment during operation.
Corrective Action Plan
Corrective Action Plan:
If a problem or abnormal service is indicated, take the associated equipment off-line as described in the Primary Clarifier - Shutdown SOP. Also, refer to the Primary Clarifier - Abnormal Service SOP and refer to SCADAlarm Procedures.
Equipment
Equipment:
EQUIPMENT
TAG NUMBER
 
 
Clarifier #1 & #2 Slide Gate
1101VLV1181B
Clarifier #2 & #3 Slide Gate
1101VLV1182B
Clarifier #3 & #4 Slide Gate
1101VLV1183B
Clarifier #4 & #5 Slide Gate
1101VLV1184B
Clarifier #5 & #2 Slide Gate
1101VLV1185B
 
 
Primary Clarifier #1 Channel Influent Valve South
1101VLV1181
Primary Clarifier #1 Channel Influent Valve North
1101VLV1181A
Primary Clarifier #2 Channel Influent Valve South
1101VLV1182
Primary Clarifier #2 Channel Influent Valve North
1101VLV1182A
Primary Clarifier #3 Channel Influent Valve South
1101VLV1183
Primary Clarifier #3 Channel Influent Valve North
1101VLV1183A
Primary Clarifier #4 Channel Influent Valve South
1101VLV1184
Primary Clarifier #4 Channel Influent Valve North
1101VLV1184A
Primary Clarifier #5 Channel Influent Valve South
1101VLV1185
Primary Clarifier #5 Channel Influent Valve North
1101VLV1185A
 
 
Primary Clarifier Sludge Collector Drive #1
1101MTR1721
Primary Clarifier Sludge Collector Drive #2 & #3
1101MTR1722
Primary Clarifier Sludge Collector Drive #4 & #5
1101MTR1723
 
 
Primary Clarifier Scum Collector Drive #1
1101MTR1724
Primary Clarifier Scum Collector Drive #2 & #3
1101MTR1725
Primary Clarifier Scum Collector Drive #4 & #5
1101GBX1726
 
 
Clarifier #1 Actuated Valve – Sludge Transfer
1102OPS1677
Clarifier #1 Actuated Valve – Sludge Transfer
1102OPS1677A
Clarifier #2 Actuated Valve – Sludge Transfer
1102OPS1677B
Clarifier #2 Actuated Valve – Sludge Transfer
1102OPS1677C
Clarifier #3 Actuated Valve – Sludge Transfer
1102OPS1677D
Clarifier #3 Actuated Valve – Sludge Transfer
1102OPS1677E
Clarifier #4 Actuated Valve – Sludge Transfer
1102OPS1677F
Clarifier #4 Actuated Valve – Sludge Transfer
1102OPS1677G
Clarifier #5 Actuated Valve – Sludge Transfer
1102OPS1677H
Clarifier #5 Actuated Valve – Sludge Transfer
1102OPS1677I
 
 
Clarifier #1 – South Drain Plug Valve
1102VLV1679
Clarifier #1 – North Drain Plug Valve
1102VLV1679A
Clarifier #2 – South Drain Plug Valve
1102VLV1679B
Clarifier #2 – North Drain Plug Valve
1102VLV1679C
Clarifier #3 – South Drain Plug Valve
1102VLV1679D
Clarifier #3 – North Drain Plug Valve
1102VLV1679E
Clarifier #4 – South Drain Plug Valve
1102VLV1679F
Clarifier #4 – North Drain Plug Valve
1102VLV1679G
Clarifier #5 – South Drain Plug Valve
1102VLV1679H
Clarifier #5 – North Drain Plug Valve
1102VLV1679I
 
 
Primary Sludge Transfer Pump #1
1102PMP1100
Primary Sludge Transfer Pump #1 – Suction Transfer Valve
1102VLV1100
Primary Sludge Transfer Pump #1 – Discharge Transfer Valve
1102VLV1100A
Primary Sludge Transfer Pump #1 – Suction Drain Valve
1102VLV1679J
Primary Sludge Transfer Pump #1 – Discharge Drain Valve
1102VLV1100D
 
 
Primary Sludge Transfer Pump #2
1102PMP1200
Primary Sludge Transfer Pump #2 – Suction Transfer Valve
1102VLV1200
Primary Sludge Transfer Pump #2 – Discharge Transfer Valve
1102VLV1200A
Primary Sludge Transfer Pump #2 – Suction Drain Valve
1102VLV1679K
Primary Sludge Transfer Pump #2 – Discharge Drain Valve
1102VLV1200D
ID
Maintenance Connect