Multriwell Brochure

The new and durable solution for landfill gas extractionCopyright Multriwell BV 2010IntroductionBio-active waste produces methane gasTraditional gas wellTraditional gas well profileTraditional gas well positions at ± 70m radiusDisadvantages of traditional gas wellsLarge distance between individual wells - each well has an influence area of more than 4,000 m²Risk of oxygen entry - risk of explosionsWater locks in the tubes might cause obstructions in gas flowWater in the tubes causes system malfunctioningHigh temperatures in the landfill cause damage to the tubesLandfill settlement causes deformation of the tubing system due to compression in those tubesDirect contact with the waste during installationIntensive maintenance requiredLow durabilityThe patentedMultriwell solutionMultriwell V-type installation procedure1) Determining Multriwell positions2) Placing anchor plate3) Needle insertion into waste body at correct depth4) Needle retraction, anchor plate fixes Multriwell in waste body5) Cutting of Multriwell after removal of needle6) Continue at step 2Construction of a Multriwell systemRecultivation layer / top soilWater drainage layerSeparation geotextileTrisoplast® liquids and gas isolation layerPorous gas collection layer / mineral leveling layerMultriwell-H horizontal gas collection wellsMultriwell-V short distance (small grids) vertical gas wells (up to 30 m deep)Mineral leveling layerWasteCross-section of a typical landfill layer structureOverview of example Multriwell designlalaTest resultsResults test site “Vink” Barneveld after 10 months (November 2010)Traditional gas well (1 well – diameter 300 mm)• Installed density : 1 per 4,200 m²• Depth : 20 m• Result : 43 m³/hour LFGMultriwell (500 Multriwell-type V and type H at grid 2x2 m)• Installed surface : 2,000 m²• Depth : 10 m• Result : 250 m³/hour LFGWith Multriwell more than 3x the amount of LFG compared with traditional well, in spite smaller area tested Results of 10 month test period (landfill containing 7% organic waste)AdvantagesUse of Multriwell system in very small grids activates bio-reaction2-6 times more gas extraction (recent site results)Prevention of oxygen entry: reduced risk of explosion (due to Trisoplast seal)No water locks or water entering wells and thus causing malfunctioningUse of small grids results in faster achievement of landfill inertia Faster and more homogeneous landfill settlementLeachate spread more evenly through the waste: reduction of perched leachateReduced hydraulic head in the waste body - reduction of contamination especially with unlined landfillsPrevention of loss of gas into open air (due to Trisoplast seal)No risk of damages causing loss of gas at large surfacesFlexible installation depth per MultriwellFaster and cleaner system installation – no contact with wasteLess maintenance and longer functionalityLower investment required for installation and aftercareMultriwell vs traditional gas wellsInstallationRoll of Multriwell materialLifting stitcher poleStitcher ready for Multriwell installationContinuous drain feed to stitcherContinuous drain feed to stitcher (detail)Attaching anchor plate to MultriwellAttaching Multriwell with anchor plate to stitcherStitcher ready for useStitcher pressing Multriwell into waste bodyData logger with installation detailsCutting off readily installed MultriwellCutting off readily installed MultriwellReadily installed Multriwell V-typeReadily installed field of MultriwellsOverlaying vertical Multriwells with horizontal onesOverlaying vertical Multriwells with horizontal onesMultriwell type HLeachate spreading at the surface Functioning Multriwell before capping with TrisoplastFunctioning Multriwell before capping with Trisoplastwww.multriwell.comThe Multriwell technology is a patented technologyoffered by Multriwell BV in the Netherlands