Septage Bioreactor Landfill A St. Clair County RDDP Proposal St. Clair County CTI & Associates, Inc.
Septage Disposal Need • Together, Macomb / St. Clair counties have approximately 50,000 septic tanks that generate 9.5 M gallons of septage annually • By 2030, the septage generation is expected to exceed 14 M gallons per year • Septage is currently disposed of at wastewater treatment plants or at licensed sites (i.e., “land application”) • St. Clair Co. has no WWTP that accepts septage
UNCONTROLLED SURFACE RUNOFF TO WATERWAYS
The Advisory Group concurred with the proposal and identified Smiths Creek Landfill as one of the four potential disposal sites
Project Background • Meanwhile, Smiths Creek Landfill was exploring various options of extending service life beyond the estimated 20 years • One promising and environmentally-sound option is the “bioreactor landfill” • The project team decided to use the bioreactor project to solve the septage disposal problem
Traditional Landfills vs. Bioreactor Landfills Traditional Landfills vs. Bioreactor Landfills
Traditional Landfills • Often times referenced as “dry tombs” • Waste remains “dry” therefore suppresses decomposition
Fall 1998 Fall 1990 8 years in a “dry” landfill
Containment Failure (Passing the liability to the next generation) Traditional Landfills (“Dry Tombs”) ? Landfill Gas Production Gas Production
Bioreactor Landfills • Inject the collected leachate back into waste mass to increase moisture content • Add other liquids (e.g., septage) to further enhance decomposition • Drastically accelerate landfill gas production (renewable energy) • Aim achieving waste “bio-stabilization” in years (vs. decades or centuries in “dry tombs”)
Bioreactor Landfill Renewable Energy Traditional Landfills (“Dry Tombs”) Landfill Gas Production Gas Production Containment Failure?
SeptageBioreactor Landfill SeptageBioreactor Landfill
Solid waste needs moisture • pH-control • nutrients microorganisms • to decompose…
Septage provides all those needs, but needs a home…
Rapid refuse decomposition, Landfill space recovery, Renewable energy source Alt. septage treatment method etc., etc.
Smiths Creek LandfillRDDP Proposal Smiths Creek LandfillRDDP Proposal
Smiths Creek LandfillRDDP Proposal • Septage treatment capacity (100,000 homes) • Recover energy to heat 800 homes for 10 years • Costs of expanding wastewater treatment capacity for septage is avoided • Potential energy recovery (> $3,000,000) • Potential space recovery (> $2,000,000)
Lift Station Septage Receiving Unit Septage Truck Septage Receiving N
Septage liquid Storage Tanks Discharge Lines Distribution System Septage Routing Receiving Facility
Project Status • Septage bioreactor cells are constructed and have been certified and licensed by MDEQ • Landfill operators began to add Municipal Solid Waste to bioreactor cells in Nov. 2006 • RDDP permit application was approved by MDEQ on February 23, 2007 • Septage introduction to begin in approximately 6 months after completion of receiving facility, storage tanks and distribution system
Conclusion • Disposal of septage in landfills is an environmentally sound practice • Septage addition will accelerate waste decomposition therefore extend landfill service life • Septage bioreactor is also a viable source of renewable energy • Brings us one step closer to the vision of “perpetual” landfill • Septage bioreactor is consistent with goals and objectives of Solid Waste Management Plan
Background on Part 115 Import/Export Authorizations • In order for a disposal area to serve the needs of another county, state, or country, the service, including the disposal of municipal solid waste incinerator ash, must be explicitly authorized in the approved solid waste management plan of the receiving county. With regard to intercounty service within Michigan, the service must also be explicitly authorized in the exporting county’s solid waste management plan. Chapter 3 of the Natural Resources and Environmental Protection Act, P.A. 451 of 1994, section 11538(6) states:
Reason for proposed amendment to Solid Waste Plan • St. Clair County has a long-standing policy of self-sufficiency with regards to the disposal of solid waste • No waste allowed into or out of county • Manage our resource for the long-term benefits of County citizens • Septage Bioreactor will help us manage our resource in a responsible manner by expanding the service life of the landfill
Thank You! For additional information, please contactDr. Te-Yang SoongCTI & Associates(248)486-5100