using rotating effluent filters to replace sand filters · • greasing of bearings of center inf....
TRANSCRIPT
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Using Rotating Effluent Filters to Replace Sand Filters
Douglas Nelson, PE
Thomas Steinbach
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Project Drivers
• Diminishing Hydraulic Capacity
• Decreased Reliability• Poor Solids Capture• Introduction of New
Technologies
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Project Steps
• Study Options– Need for Replacement
– General Costs• Detailed Financial Analysis• Design• Construction
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Options Considered
• Replace the Existing Filters in Kind• Construct Deep Bed Filters in a Different
Structure
• Construct Cloth Bed Traveling Bridge Filters• Construct Rotary Disc Media Filters
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Options Considered‐Replace in Kind
• Known Entity• Flows Limited to
Existing Flows
• High Backwash Rates
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Options Considered‐Deep Bed Filters
• Similar Technology
• Lower Flow/SF• NEEDS MORE HEAD
– Pumps
– $$$$
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Options Considered‐Cloth Traveling Bridge Filters
• Similar Technology
• Greater Flux Rate• Could be Retrofitted
into Existing Space
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Options Considered‐Rotary Disc Filters
• Proven New Technology• High Flux Rates• Same or More
Mechanicals as Other Systems
• Low Head Loss (No Pumps)
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Non Monetary Elimination
Replacement
• Saw P rules coming‐High
Solids Pass‐through
• Needed Additional
Capacity/ Building Cost
Deep Bed Sand Filter
• High Construction Cost
• Need to Add More Pumping
• Higher O&M
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Financial Analysis Cloth Filter Traveling Bridge 2005 Costs
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Financial Analysis Disc Filter 2005 Costs
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O&M Costs 2005 Costs
Cloth TB
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Actual Costs
$2,188,754
$2,246,676
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City of Oconomowoc
Wastewater Treatment Facility
Headworks
and Effluent Filter Upgrade
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Inf. Screen 9.0
12.0
Tertiary
Filt. 9.0
12.0
2008 Inf. Screen and Tertiary
Filter upgrade & Expansion
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Existing Tertiary Filters
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Kruger disc filter
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Present Operations
• Two filters at a time – six months
• Upon removal from service – bleach soak and drain
• One filter on each side of inf. channel.• Normal backwash cycle time = 6 minutes
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Maintenance
• Greasing of bearings of center inf. tube – once every two weeks.
• Drive chain lubrication – once per year.• Reducer oil change – every three years.• Backwash filter cleaning – once every six months.
• Cleaning after use, one day.• Acid cleaning for mineral fouling. As needed.
• Spray nozzle cleaning – as needed.
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0
50
100
150
200
250
300
‐1.0
1.0
3.0
5.0
7.0
9.0
11.0
13.0
2006 2007 2008 2009 2010
Backwash Volume ‐Gal/day x 1,000
Effluent SS ‐mg/l
Effluent SS, Backwash Volume, and Filter CapacityEffluent SS
Filter Capacity
Filter Backwash
Filter Installation
‐37% or 87,000 gal/day
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Backwash Reduction
• 37% average reduction• 87,000 gallons / day• 350 equivalent residential units
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Iron Fouling During Phosphorus Removal Testing
April – June 2011
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Phosphorus Removal Testing
• Goal ‐
Reduce our effluent to 0.4 mg/l monthly average
• Ferrous Chloride fed to primary clarifier
• Chemical increase from 150 to 220 Gal/day
• In two months we noted increasing backwash frequency.
• First chemical fouling since startup
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Summary
• Filters have reduced maintenance significantly.
• Reduced footprint while increasing capacity• Eliminated filter bypassing
• Increased operational flexibility• Reduced energy in filter building• Reduced filter fly headaches
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Successful Project Wisdom
• Take the time to review current technology
• Visit sites • Talk to operators• Look at value over the long term – LIFE CYCLE
ANALYSIS –
including consumables
• Lock in prices early – before the project bid
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We thank you for your attention !!!
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Questions ???