swana chapter conference 2008 west edmonton landfill leachate treatment plant by steve johnson...
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SWANA Chapter Conference 2008
West Edmonton Landfill
Leachate Treatment Plant
By Steve Johnson M.Eng, P.Eng
Introduction
• Leachate Management Options
• West Edmonton Leachate treatment process
• Treatment Plant Commissioning/Status
• Lessons learned
Leachate Management Options
• Dispose to municipal wastewater treatment plant
• Dispose to deepwell
• recirculate
• Onsite treatment
• Mechanical plant
• Evaporator
• wetlands
• Do nothing
Leachate treatment process
• Phases of leachate management since 1974• Do nothing
• dust control
• Recirculation/offsite deep well disposal
• Develop leachate treatment plant
Leachate treatment process
In 2006 evaluate leachate treatment options• Consultants
• Leachate quantity estimate
• Technology evaluation
• Disposal options
• Haul to deepwell – unreliable
• Recirculation no longer approved by AENV
• City of Edmonton sewer bylaw
• To reduce liability best to treat on-site
Treatment Plant Commissioning/Status
• New Logic Research Inc. http://www.vsep.com/
• Vibratory Sheer Enhanced Processing technology
• Leachate pilot plant test conducted in US
• Pilot test basis• 5 day trial
• Several membranes investigated for pressures, short term line out, concentration, cleaning
Treatment Plant Commissioning/Status
• Plant set up during fall of 2007• 4 Feed tanks• 3 mix tanks• 2 concentrate tanks• 2 permeate tanks• Hot water tank• VSEP skid• Pumps, valves, hoses
• Treatment R&D trials for approximately 6 months• Leachate mixes as quality varies throughout landfill• Single pass and percent recovery modes• pH, anti-scaling, and process temperature
Treatment Plant Commissioning/Status
• Quality targets• Permeate - City of Edmonton sanitary sewer bylaw
• Permeate - Agriculture irrigation guideline
• Concentrate - Non-haz waste – AB User’s Guide
• Operational finding with current leachate mix• Single pass mode
• 4 to 4.5 m3/hr depending on cleaning frequency
• Permeate to concentrate ratio of 80:20
Treatment Plant Commissioning/Status
• Operational finding with current leachate mix (cont.)• Percent recovery mode
• Membrane efficiency decreases at a faster rate then single pass
• Concentrate quality worse then single pass
Current Operation• Six hours per day five days per week
• Two hours per day for cleaning
Treatment Plant Commissioning/Status
• Future developments• R&D to trial temperature adjustment (heat exchanger), pH
adjustment, and anti-scaling to determine affect on membrane performance
• Plan to add another shift in route to automate plant for 24 hr/d operation
• To include additional feed, blend, and concentrate tanks
• Treatment target of 6 to 7 m3/hr
Lessons learned
• New computer hard drives can crash (have a back-up)• There is always one or more parameters where mass balance
doesn’t apply to the laboratory results between feed, concentrate and permeate
• New Logic Research has good customer service and documentation (process binders, operations binders)
• Plant design to include upgraded breaker and checkvalve in cleaning loop
• Laboratory response time is inadequate for R&D• Limited odour experienced • R&D takes much longer than anticipated
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