City of Portland Biosolids Benefits & The Future
Citizen Advisory Committee
January 27, 2010
Biosolids Criteria
•Pathogen Reduction
•Vector Attraction Reduction
•Pollutants
0
500,000
1,000,000
1,500,000
2,000,000
EPA Max PDX
Class B Pathogen
Compliance Demonstration
Fecal Coliform
Measurement 59,580
Pathogen Reduction
15 days @ 95°F
Vector Attraction Reduction
Volatile Solids Reduction: 63% vs 38%
Odor Monitor
Land Application Program Class B Biosolids Trace Inorganics
1
10
100
1000
10000
As Cd Cu Pb Hg Mo Ni Se Zn
EPA PC Limit
Portland Biosolids
mg
/kg
0
200
400
600
800
1000
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
2005
Lead
Con
centration
(mg/k
g)
Year
PC Limit: 300 mg/kg
Ceiling Limit: 840 mg/kg
Biosolids Dewatering
~21% Cake
2,013 loads - 2009
36,392 loads – Since 1992
Madison Farms – Land ApplicationDEQ Authorized Acreage
554 ac 232 ac4,578 ac
1992-Present1,256,171 wet tons
(252,760 dry tons)
Biosolids Benefits on Semi-Arid Central Oregon Agriculture
Mark Ronayne & Greg Charr (City of Portland)
Dan Sullivan & Don Horneck (Oregon State University) Kent Madison (Madison Farms)
Biosolids Benefits To Forage and Soil
• Increased grass yield (530%) • Increased grass quality
– More shoots/leaves– More digestible (lower fiber, higher protein)– Increased nutrient concentrations
• Soil Benefits – Increased organic matter and nutrient
concentrations– No accumulation of salts
Beef Production Benefits
Carbon Footprint
• Fuel for Transport = 500 tons CO2/yr
• Fuel for Land Application = 35 tons CO2/yr
• Carbon sequestered in forage/soil = -4,050 tons CO2/yr
• Net Carbon = -3,515 tons CO2/yr
• Oxygen Release = 8,800 tons O2/yr
200,000 gal/yr
Canola
Aim of Biosolids RFP
• Strengthen, diversify, and enhance existing land application program.
• Explore opportunities for cost savings.• Reduce diesel fuel consumption.• Potential 5-year contract with extensions up to
five additional years.• Up to 25,500 wet tons/year
Biosolids Use Options
• Land application (agricultural & silvicultural)
• Soil amendment or compost mix
• Renewable energy source
Evaluation Criteria Weighting
30%30%
10%10%
15%5%
Costs and Revenues
Biosolids Use Option
Qualification and KeyPersonnelExperience/PastPerformanceCommunity Impacts
Diversity
Diversification/Haul Savings
2000 Wheat Trial All-Weather Site – Madison Farms
New Land Application Sites Sherman County
$0
$10
$20
$30
$40
Madison Sherman
$/Wet ton
$34
$22.97
~$280,000 annual cost savings
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