Transcript Aerobic On-Site Sewage Facility Maintenance
Advanced Maintenance Provider
Aeration Equipment …
Advanced Maintenance Provider
Aeration Equipment …
Outline / Objectives…
Function / Purpose
Regulatory Requirements
Types by Functionality
Maintenance Activities
Tools
Trouble Shooting
Safety Concerns
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Aeration Equipment …
Function / Purpose …
Used to supply air (oxygen) to the delivery system in aeration chamber of aerobic plant.
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Aeration Equipment …
Regulatory Requirements …
Maintain manufacturer’s specifications at NSF testing for plant size.
Air Flow
Air Pressure
NOTE: Make & Model may change !
Maintained according to manufacturer’s specifications.
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Aeration Equipment …
Types by Functionality…
Air Generation
Compressors Rotary Linear Aerators
Air Supply Air Delivery
Aspirator Diffusers Piping with slotted or drilled holes
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Aeration Equipment …
Types … Compressors
Rotary
Motor rotating disk with 3-4 carbon vanes.
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Aeration Equipment …
Types … Compressors
Linear
Shuttle arm attached to diaphragms
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Aeration Equipment …
Types … Aerators
Used in Jet & Norweco systems.
Hollow shaft extending into water.
Aspirator shears air into small bubbles.
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Aeration Equipment …
Types … Aerators
Used in Multi-Flow systems.
Located 12” off bottom of aeration chamber.
Motor turns impeller which reduces pressure to draw air through air pipe.
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Aeration Equipment …
Types … Air Supply
Piping … Compressors
Hollow Shaft – Aerators - Jet & Norweco
Air Intake Pipe – Aerator - Multi Flow
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Aeration Equipment …
Types … Air Delivery
Aspirator
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Aeration Equipment …
Types … Air Delivery
Aspirator
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Aeration Equipment …
Types … Air Delivery
Diffusers
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Aeration Equipment …
Types … Air Delivery
Pipe with drilled holes
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Aeration Equipment …
Maintenance Activities …
Check Pressure / Air Flow
? Within Manfg. Specs.
? Flock level in plant
? Summer vs Winter
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Aeration Equipment…
Maintenance Activities …
Check Temperature
? Too Hot to hold hand on
High temperatures shorten life on …
Bearings
O-Rings Diaphragms
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Aeration Equipment…
Maintenance Activities…
Check Noise
? Rubber sounding thump
? Metal pinging / grinding
Indicators of …
Diaphragms / bearings going out
Sticking vane
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Aeration Equipment…
Maintenance Activities…
Check for signs of water
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Aeration Equipment…
Maintenance Activities…
Check for signs of ants
NOTE: Report to customer!
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Aeration Equipment…
Maintenance Activities…
Ant solution …
Ant Poison Elevate Compressor Medicated cattle ear tags
Do Not Apply Poison!!!!
Why?
License Needed
Lasts about 30 days
Liability
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Aeration Equipment…
Maintenance Activities…
Clean Filters
Check O-Rings
Check Filter Housing
Clean Air Shaft
Clean Aspirator
NOTE: Re-check pressure after cleaning filters
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Aeration Equipment…
Maintenance Activities…
Clean Air Shaft
Clean Aspirator
Check for vibration
Look for buildup or debris on foam restrictor / shaft
NOTES…
Re-check air flow after cleaning shaft or aspirator.
Never put pressure on shaft
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Aeration Equipment…
Maintenance Activities …
Change out / Clean diffusers ???
NOTE: Depends on your contract !
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Aeration Equipment…
Tools…
Air Gauges
Brushes to clean air shafts and aspirators
Spray bottle with soapy water to detect air leaks
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Aeration Equipment…
Trouble Shooting…
Low Air Flow
Causes …
Restricted or clogged air intake on shaft or aspirator
Aerator may be installed too deep
NOTE: Never run Multi Flow with less than 2’ of water covering it
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Aeration Equipment…
Trouble Shooting…
Low Pressure
Causes …
Restricted or clogged air intake filter
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Aeration Equipment…
Trouble Shooting…
Low Pressure
Causes …
Leak on output side of compressor
Filter Housing
Gasket
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Aeration Equipment…
Trouble Shooting…
Low Pressure
Causes …
Worn / stuck vanes
Worn diaphragms
Check valve flap
Crack in tubing from diaphragms to air chamber in base.
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Aeration Equipment…
Trouble Shooting…
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Low Pressure Causes …
•
Leak in air supply line due to…
Heat Ground shifting
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Aeration Equipment…
Trouble Shooting…
Low Pressure
Causes …
Cracked or blown…
Diffuser
O-Ring
Air Yoke
Air Drop
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Aeration Equipment…
Trouble Shooting…
Water on filters.
Hint … High Pressure and Humidity
Results in …
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Aeration Equipment…
Trouble Shooting…
Pressure different at compressor and tank.
Causes …
What about friction loss?
(This was a 147’ run!) Check manufacturer’s requirements!
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Aeration Equipment…
Trouble Shooting…
High Air Pressure
Causes …
Clogged air supply line
Clogged air diffuser
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Aeration Equipment…
Trouble Shooting…
Un-even air flow on diffusers / dead zones
Causes …
Un-level tank installation
Air drops different length
Clogged diffusers
Build up
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Aeration Equipment…
Safety Concerns …
Electrical
Bacterial
Chemical
Animal / Insect
Snakes
Spiders
Wasps