Sustainable Redevelopment of an Uncontrolled Dumping Site into an Integrated Waste Recycling and Treatment Centre, Moen, Belgium
Dr. S. HelsenZagreb25/11/2010
Intermunicipal Organisation IMOG
Intermunicipal waste organisation in Flanders (BE):11 municipalitiespop. 227.000
Yearly turnover26 million euro (2009)
200 employees
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IMOG Objectives
Treatment of household waste through sustainable waste management
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Overview landfill expansionsand current activities
Initiatives reduce and recycle waste
Business planfor expansionof landfill
Old landfill covered and remediated
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Clay quarry & landfill expansion
Excavation of quarry for brick industry
Excavated clay reused as seal
Covered landfill partly developed as treatment centre for dredged sediments
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Secondary use covered landfill
Delivery of cat. 1 waste (industrial waste) reducedEmphasis on cat. 2 waste (mainly household waste)
Groundwater pollution (metals, salts,…) landfill leachate constitutes risk to environment and nearby waterway
To prevent further spreading soil remediation project
Hydrogeologically isolating entire landfill site
Groundwater protection
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Impermeable cement-bentonite slurry wall around landfill site
Wall to depth of 20 m below groundsurface
Quality control procedure to ensure depth was reached
Groundwater flow and water levels calculated by modeling and compared to field data
Groundwater protection
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Wastewaters evacuated to biological treatment plant:
Rain Water seeping through the landfill Runoffs Wheel washing residues Domestic waste water
Optimal treatment efficiency through operatedand monitored facility
BATNEEC principles
Wastewater treatment
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Green buffer of 6 m wide Integrated in existing landscape Maximizes ecological potential with native plants Corridorfor local faunas
Visual hindrance
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Management of waste fractions
Processing through incineration (Harelbeke site) 1.6 billion kgProduction of electricity 600 m. kwhRemoval through landfill 1.5 billion kgSelective collection of paper and cardboard 220 m.kgSelective collection of glass bottles and jars 100 m. kgComposting of green waste 300 m.kgProducing and marketing of compost 75 million kg
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Collected quantities waste fractions civic amenity sites
Operation of 16 civic amenity sites
Separate collection of 40 waste fractions
Differential pricing applied: pay according to type and quantity of materials following ‘polluter pays, the preventer saves’
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Sorting centers for: bulky waste sorting line wood waste sorting cleaning line
Manual and mechanicalsorting for: paper and cardboard inert building materials wood, plastics, ....
Non-recyclable fractionsent to compactor
Sorting centers for bulky waste
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Wood waste segregated into: untreated treated, uncontaminated contaminated
Crushed and sieved into fractions
Used as biomass for energy and/or MDF wood
Wood sorting centre
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Green waste sorting and processing important
Respond to demand new equipment: trucks, sieving and shredding machinery new composting and maturation areas constructed building of area for sieved compost quality label developed and compost market explored
30.000 ton green waste to composting installation
13.000 ton compost and 3000 ton wood chips sold on local market
Composting
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Street sweep refuse picked up by brush or sweep trucks
Litter, sand, leaves and small branches
Optimization of waste sorting line
Waste cleaned and segregated: sand fraction reused as a secondary raw material plastic metal green waste combustible waste
Treatment street & sweep refuse
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High demand treatment dredged sediments fromnavigable and non-navigable waterways
Development of treatment centre for dredged sediments
Dredged sediments : Arrive by ship over the adjacent waterway Dewatering Material excavated and removed once dry Use for final landfill cover or as filling materials in road constructions or noise barriers
Treatment dredged sediments
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1999 selective collection, sorting and treatmentof wood waste
Wood collected at civic amenity sites: recycled(production of MDF board)
2005 non-recyclable wood: biomass power plant(green energy)
Every year 30.000 ton of biomass produced =41 million kWh = electric consumption for pop. 32.000
Biomass centre
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Potential landfill gas extraction
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12 vertical wells &Horiz. HDPE pipesto central location
> 500 m³/hrcombustion engine electricity
< 500 m³/hr:Micro turbine electricityFlare system
Landfill closed: after care and monitoring for 30 yrs
Site developed cfr. local / regional planning regulations
2 ha of solar panels on old landfill Electrical energy used on site; excess: through the grid
Entire landfill ‘closed’ 10 ha of photovoltaic cells Energy for 1500 families
Solar energy park
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Success based on :
Use of various communication methods Public awareness Education encouraging waste prevention and Improving sorting at source Secondary materials quality Creates social basis for waste management practices
Aim: export technical and operational knowledge
Collaborations with EU partners in transitional and developing countries, incl. Western Balkans
Exporting forty yearsof knowhow
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Waste :
Source for secondary materials and renewable energy
Creates job opportunities and profits
Management demands investment with risks
Management requires technical skills, technology, organization and monitoring
Conclusion
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Thank you for the attention
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