Bioreactor Demonstration Project Update

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Bioreactor Demonstration Project Update

• May 14, 2004

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Vertical Injection Well Clusters 134 wells in 45
clusters
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Vertical Injection Well Clusters Leachate
Recirculation
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Vertical Injection Well Clusters Leachate
Recirculation at present
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Vertical Injection Well Clusters Leachate
Recirculation at present
Majority of leachate has been recirculated in
anaerobic zone
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Leachate Recirculation
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MTG Sensor Data

• MTG sensor data being collected continuously
• Data providing adequate knowledge about spatial
  moisture distribution
• Moisture content (MC) value assessment
  methodology from MTG sensors being developed

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Calibration Curve for MC
16.0 mS/cm in process
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Moisture Content Plots
Data April 28, 2004
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Differential MC Plots
Data April 04 Oct 03
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Temperature Plots
Data April 28, 2004
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Data Interpretation

• MC plots made using 8.0 mS/cm calibration curve
• Precise MC value can be evaluated after
  application of higher eC value
• MC increased by approximately 10 (w/w) since
  beginning of injection using statistical average
• This MC increase is equivalent to the addition of
  2.9 million gallons
• Temperature has increased 0.5oC

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New River Regional Landfill
Alachua CountySouthwest Landfill
Polk CountyNorth Central Landfill
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ACSWL

• Began receiving waste in the 1970s
• A composite lined landfill unit was constructed
  in 1988
• 27 acres, constructed in two phases
• Disposed on the order of 300 tons per day of MSW
• Closed in 1999

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Research at ACSWL

• Research has been ongoing at the site since 1988
• Professor W. Lamar Miller
• Funding by Alachua County Public Works
  Department, Florida Center for Solid and
  Hazardous Waste Management and US EPA
• Research into leachate recirculation and
  accelerated waste stabilization began in 1990.

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Horizontal Injection

• Horizontal injection trenches were constructed in
  the northern half of the landfill beginning in
  1992.

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ACSWL Cross-Section Showing Injection Laterals
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Pond System
HIL System
LeachateRecirculationResumes
Operating Years
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Current Activities at the Site

• No major leachate recirculation activities after
  1996.
• Landfill was closed and capped in 1998/1999.
• The system was recently modified to recirculate
  leachate underneath the cap.
• A gas-to-energy system has been installed at the
  site.

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Current Activities Recirculation Under the Cap
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Gas is converted to green energy
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Gas to Energy

• Power generation system
• Three CAT, 825 KW, 16-cylinder modified diesel
  engines
• Take 45-58 CH4, and approx. 325 scfm each
• Total maximum generation is 2.4 MW (approx.)

• Gas Collection system
• 40 Hp adjustable frequency drive(AFD) blowers,
  two in all
• Blowers have 0.1 micron filters
• Maximum 80 H2O vacuum per blower

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Polk County North Central Landfill

• Currently constructing and permitting a
  bioreactor
• Installing horizontal injection trenches
• Evaluating methods of recirculating leachate

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NCLF Phase II 2001
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NCLF Phase II 2004
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• Leachate injection lines are installed in the
  waste as the landfill is filled up.

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First Two Injection Lines
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Placing First Line in Trench
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Filling in Trench
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New Method for Installation Vibratory Plow
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Horizontal Injection Line Installation Progress
at Polk County NCLF
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Existing Horizontal Leachate Injection Lines
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Phase II
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Lines Installed Fall/Winter 2003/04
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Phase I
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Present Waste Extent
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Horizontal Injection Line Installation Progress
at Polk County NCLF
LCS Trench Divide
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Subcell 1
LCS Pipe
Installed Horizontal Leachate Injection Lines
Lines Installed Fall/Winter 2003/2004
Phase I
Present Waste Contours
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Status

• The bioreactor permit modification has been
  prepared and submitted.
• Leaching recirculation lines continue to be
  installed.
• Construction will begin by the end of the year on
  leachate delivery system.

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Unlined Landfill Unit at NCLF
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NewLinedLandfill
OldExistingLandfill
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Potential NewLined Landfill Cells
Added Disposal Capacity 9 million tons At
current tipping fee 310 million
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To examine the suitability ofthe old landfill as
a foundationfor the new landfill, samples
ofwaste were collected using a3-ft bucket auger.
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Some of the waste was relatively decomposed
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Some of the waste was clearly not decomposed
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Green yard trash from 20-year old waste sample
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Samples were collected for characterization
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Samples were collected for characterization
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Samples were weighed
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A great number of samples were collected!
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• Many types of analyses will be conducted on the
  samples.
• Chemical parameters
• Moisture content
• Compressibility
• The device here was constructed for this project
  to examine the stress-strain modulus of the
  excavated waste samples.

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Exploring Crushed Glass as a Drainage Media