Post on 18-Dec-2015
Multi-criteria analysis for the identification of waste
disposal areas
Presentation byEri Kudo and Olivier Mills
Identification of waste disposal areas
• For centuries unconcerned about waste
• Industrial revolution Exponential increase in volume
• Today, one of the most crucial problems faced by urban centres is WHERE to dispose of it
Case study : Brazil - Disposing of marble and granite
• Marble and Granite Industry large volumes of waste (up to 25% of rock in form of sludge)
• Discarded by tanks in ponds or rivers
• Silting (surface water), increase hardness, increased Aluminium (groundwater)
Waste disposal area identificationMulti-criteria analysis : Method
1) Define criteria (factors and and restrictions)
CriteriaFactors(degree of aptness)
Restrictions(apt, inapt)
EnvironmentalHydrography, flaws, pedology, geology, geomorphology
Hydrography, geological, +200m buffer
OperationalRoads system Declinivity (allowed
interval from 1% to 30%)
Socio-economicUrban zone, districts, farms
Urban zone, districts, farms, + 500m buffer
Waste disposal area identification - Method
1) Define criteria, factors and restrictions
Waste disposal area identification
Urban perimeter
Hillshading
Hydrography
Hillshading, hydrography and urban perimeter
Waste disposal area identification
Urban perimeter
Farm
District
Urban perimeter, Farms,district and road system
Road system
Waste disposal area identificationMulti-criteria analysis : Method
1) Define criteria (restrictions and factors)
2) Standardize (normalize to same scale)
Waste disposal area identification
Geologic Map
Waste disposal area identification
Pedologic Map
Waste disposal area identificationMulti-criteria analysis : Method
1) Define criteria (restrictions and factors)
2) Standardize (normalize to same scale)
3) Weight factors and criteria
Waste disposal area identification - Method
3) Factor Weighting
Hydrography Geological
fl aw Pedology GeomorphologyEnvironmental
Operational
Urban Zone Disctricts Farms
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Socio-economic
Geo
log
y
Road system
Waste disposal area identification - Method
3) Criteria weighting
Waste disposal area identificationMulti-criteria analysis : Method
1) Define criteria (restrictions and factors)
2) Standardize (normalize to same scale)
3) Weight factors and criteria
4) Aggregate (put together)
Waste disposal area identification – Aggregation and output
Waste disposal area identification – Aggregation and output
Waste disposal area identification – Conclusion
ADVANTAGES
- Low cost (GIS) - Model multiple scenarios (high risk, low risk)- Graphical representation of options- Dynamic (GIS data)
DISADVANTAGES
- Careful choice of criteria and weighting functions- Coherence with reality- Doesn’t consider whole life of disposal site (time factor)
GIS + Multi-criteria analysis