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