M&M Work Schedules
Wastewater Treatment Plants
Monthly
Hand
Cleaned Grit Chamber
· Calculate and record velocity and detention time, and compare to design and process standards
Mechanically Cleaned Grit Chamber
· Calculate and record velocity and detention time, and compare to design and process standards
Aerated Grit Chamber
· Blow out all air lines
· Clean diffusers
Þ Grease swing arm knees
· Calculate and record surface settling rate and detention time, and compare to design and process standards
Primary Clarifiers
· Check the overload system and alarm
· Check for sludge buildup
· Check and adjust sludge pumping schedule
· Check oil levels in worm gear and spur gear
· Calculate and record detention time, surface settling rate, weir overflow rate, removal efficiencies, and sludge production rates, and compare to design and process standards
Trickling Filter
· Flush vents, underdrains and collection boxes
· Check the distribution (pan test)
· Calculate and record the hydraulic and organic loading rates, and removal efficiencies, and compare to design and process standards
Activated Sludge Aeration Tank
· Blow out all air lines
· Clean diffusers
Þ Grease swing arm knees
· Calculate and record detention time, organic loading rates, and removal efficiencies, and compare to design and process standards
Lagoons
· Ponds
Þ Check for sludge deposits
Þ Check for short circuiting
Þ Check for dead spots
· Transfer Structures
Þ Clean
· Lab Tests
Þ Run a D.O. profile in the pond
Final Clarifiers
· Check the overload system and alarm
· Check for sludge buildup
· Check and adjust sludge pumping schedule
· Check oil levels in worm gear and spur gear
· Calculate and record detention time, surface settling rate, weir overflow rate, removal efficiencies, and sludge production rates, and compare to design and process standards
Chlorination
· Calculate and record the chlorine dosage, demand, and residual, and compare to design and process standards
Anaerobic Digesters
· Blow out all gas lines
· Check and adjust digested sludge removal schedule
· Check and record carbon dioxide concentrations in the stack gases from furnaces burning digester gas
· Grease wheels on floating cover
· Calculate and record the detention time, volatile solids loading rate, volatile solids reduction, volatile acid/alkalinity ratio, gas production rates, and the digested sludge production rate, and compare to design and process standards
Aerobic Digesters
· Blow out all gas lines
· Clean diffusers
· Grease swing arm knees
· Check and adjust digested sludge removal schedule
· Calculate and record the detention time, volatile solids loading rate, volatile solids reduction, and the digested sludge production rate, and compare to design and process standards
Control Panels
· Check heaters and electrical connections for corrosion, tightness, and proper operation
· Clean outside of panel
· Turn off power
Þ Vacuum and clean inside
Motors
· Check heaters and electrical connections for corrosion, tightness, and proper operation
· Check draw on each lead wire
Þ All should read the same and agree with the ratings
· Clean outside of panel
· Turn off power
Þ Vacuum and clean inside
Blowers and Compressors
· Clean filters
Flow Meters and Recorders
· Calibrate by hand
Valves
· Operate all valves
Þ Record and compare number turns between full open and full close
· Lubricate all valve stems
Þ Check for wear and broken threads
· Clean
· Check packing
· Telescopic
Þ Grease
· Plug
Þ Grease
· Ball check
Þ Check balls and seats for wear, pitting, and cracks
· Swing check
Þ Operate lever to see if broken shear pin or shaft
Þ Lubricate shaft
Standby Generators
· Check battery
Þ Specific gravity
· Check condition of gauges
Furnace
· Replace filters
General
· Gates and Fences
Þ Check for corrosion
Þ Check signs to see that they are visible and readable
Return to M&M Work Schedules
For more information, call 515-232-1663