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Partnering with POTWs to Use P2 to Achieve Industrial Phosphorus Reduction
Cindy McComas
University of Minnesota—MnTAP
612-624-4678
Point vs Non Point Phosphorus Sources--Minnesota River Basin
High flow
Non point 90 %
Point source 10 %
Low flow
36 %
64 %
Challenges Facing WWTFs
• Reduce phosphorus and other pollutant loading
• Prepare Phosphorus Management Plans
• Meet 1 mg/L limit
• Aging systems
Three Strategies for Phosphorus Reduction
• Industrial/commercial/institutional
• Residential education
• Removal at POTW
Industrial Assistance Approach
• Contact with POTWs in three basins: Upper and Lower Mississippi Rivers, Minnesota River
• Identify industrial phosphorus contributors
• Provide phosphorus reduction assistance to industrial contributors (site visits, interns, teams)
MnTAP, University of Minnesota
• Site visits
• Student interns
• Facilitated industry teams
• Resources for mercury elimination
Industrial Sources of Phosphorus
• Metal conversion coatings (prior to painting)
• Food processing and food waste
• Cleaning and sanitizing operations
Electrolux, St. Cloud
• Manufactures freezers
• Switched two cleaning/conversion coating lines to no phosphorus
• Reduced phosphorus by 90% from 42 lb/day to below 5 lb/day
Bongards Creameries, Norwood
• Butter, cheese and whey powder
• Changes: – clean in place systems
– dry cleanup prior to wet cleanup
– installed level sensors on tanks
• Reduced phosphorus by 60% from 150 lb/day to 60 lb/day
Schwan Food Company, Marshall
• Frozen foods• Switched to low/
no P cleaners and sanitizers
• Reduced P from 36 lb/day to 13 lb/day; 8,400 lb/yr
• 30% reduction at the same time as a 31% increase in flow
Industrial Loading Impact on POTW
• City of Richmond and meat locker• Wastewater treatment plant went
from influent of 11.25 ppm (9.4 lb/day) to 5 ppm (4.2 lb/day)
• Meat locker reduced 1,092 lb phosphorus/yr by keeping material off the floor and moving to no-phosphorus cleaners
Activity Results
• Contacts: 200 POTWs 131 industrial
facilities
• Site visits: 62 POTWs113 industries
• Intern projects: 7
Outcome Results
• Reduced– Phosphorus 65,950 lb
– BOD/TSS 7.5 million lb
– Water 104 million gal
• Cost savings to businesses– $3.2 million
Lessons Learned
• Partnering with POTWs to reach industries
• P2 is an effective tool to reduce P and other pollutants to POTWs
• Regulatory requirements are motivators (PMP and P limits)
• Industries save money due to more efficient use of raw materials
• POTWs cut costs for chemical use
Next Steps—Community Wide Reduction Effort
• Partner with cities
• Inventory businesses
• Educate business and residential contributors
• Provide assistance to identify phosphorus reduction options
• Measure reductions
Project Support
• U.S. EPA Region 5
• The McKnight Foundation
• Minnesota Office of Environmental Assistance
• Minnesota Pollution Control Agency
