Strategic Analysyis Of Alternatives For Waste Management In Valle De Aburrá 2008

A CONTRIBUTION TO THE STRATEGIC ANALYSIS OF ALTERNATIVES FOR WASTE MANAGEMENT IN THE VALLE DE ABURRÁ

AREA, MEDELLÍN-COLOMBIA

Enrique Posada INDISA S.A

2008

MEDELLÍN, LA TACITA DE PLATA

• Medellín , at some time from the second half of the last century, was famously clean, and was called The Little Silver Bowl.

• But all the waste destiny was the Medellín river and some of the many streams crossing the city, its gorges, and unattended uninhabited lots.

• A municipal agreement ordered in the 1970s its disposition in a lot in the depressed sector of Moravia, where by more than 10 years a sweepings waste mountain grew together with the humble and hard working people scavenging the materials and recycling them.

• In the 1980 the word “sanitary filling” appeared and a new site, the Curve of Rodas, three kms from the city, which was handled without much real planning, solved the problem by 19 years.

• Under public pressure that site was replaced in 2003 by the so called “environmental park” of La Pradera, now located 75 kilometers form the city.

DEAD RIVER, RIVER OF LIGTHS

Tales of a urban river

I used to be meandering free and clean,but the city needed my ways,straightened my sluggish curves and burdened me with waste and refuse.

I served it well and finally died, and now the city, gratefulcelebrates with Christmas lights,and though I let them cover me with them, and I look fine, I still hope for the daywhen they will not needartifices to admire me, and when I get to be alive againand appreciated simply as I am.

MORAVIA, FROM WASTE MOUNTAIN TO BARRIO

The brave people

They came from the country side attracted by the tempting cityor running away from the ward lordsor dreaming with a new world

Here they found a placeamidst the rubble and the smellswhich they proudly called homeand the waste was gold for them.

PLANNING AFTER THE FACT

Creative planning

Do not be sure or surprised,anything could happen here,in this amazing citythat converts a waste mountaininto urban renewalwhile the workers travel home or while the visitorscome to admire from the new cable carthat flies over the crowded hills

LA PRADERA, A COMPLEX SITE

The author, working for INDISA S.A., acted as a consultant for the direction of planning of the Empresas Varias de Medellín in 2004.

This entity has the responsibility for the handling of the solid wastes for the city of Medellín and for some of the neighboring municipalities of this area of 3 million people.

At the present time more the 700.000 annual tons of waste are taken to the site of La Pradera, located in very rainy location (3.000 mm of precipitation per year), with complex in topography and very far away from the sources of the waste.

One of the theoretical attractives of this site was that a rail track links it with the city… but rail tracks are currently mostly out of use in the zone.


My daily journey

This is the road to the Prairie.I go there in my powerful truck loaded with refuseso that the wasteful peoplemay have their house in order and the dirt away from them.

I also forget about the waste,and forgive the smells,enchanted by the viewsand by the green mountains that adorn my ways.


Indeed a Prairie

The new land fill sitedeserves the name it has,because of the green beautiful lands. But the city cares little to admire,all this is far, far awayand people are busyand do not have much time for poetry or similarwastes of time.


Perhaps too much beauty is taken by granted and make people unable to observe details and to keep it alive and thriving


Waters all around

Water is so plenty

and the mountains so generous with them,

that we think

that they are eternal

or disposable,

or defiant,

so we proceed

to waste the streams,

taming and humbling them

with careless deeds.


The region is a natural gardenand deserves special carewith plenty of gardenersproud and respectful,otherwise the flowers will sadlycease to be

NEED FOR STRATEGIC PLANNING

Important issues that should be addressed in the way problems are managed•Lack of adequate technical administration and resources. The entity do not count with sufficient human resources to focus on the appropriate technical handling of the solid waste.

•The organizations work mostly with independent contractors, lacking enough coherence and integration.

•The internal workload is too large for the few people who have technical responsibility and this gave rise to attention problems

•As a result, the site has frequently problems with vultures, lack of immediate cover up for the waste, uncontrolled leaching, the areas becoming dirty and little attractive, despite being called a park


Important issues that should be addressed in the way problems are managed•In general projects for separation and recovery do not give the waited for results and are abandoned.•The neighboring communities, the environmental groups and the environmental authorities usually are in attitude of fear and criticism.•There is lack of integral planning programs. The organization are not oriented decidedly towards integral planning programs for handling waste. It tends to act in reaction to daily pressures in the middle of many limitations. •It is important to have an integral approach based on goals, backed by enough dedicated personnel, monitored by management indicators, rich in good communications with the authorities and the community and instrumented with cost benefit analysis to rationalize economics.


An Integral planning model is proposed as a basis for strategic analysis with the following elements

•Program of education, separation in the source and recycling.

•Appropriate handling of lixiviates

•Treating of biogases generated

•Thermal plant for recovering energy,

•Rotary incinerator

•Appropriate handling of the land filling site.

PROGRAM OF EDUCATION, SEPARATION IN THE SOURCE AND RECYCLING

Existence of appropriate centers for storing, dispatching and separation of waste and the availability of sufficient human resources dedicated to these activities.

Complete educative programs and activities of motivation of the community, employing all the necessary mass media and other means.

The model considered the costs and benefits, the human resources, the necessary areas and the investments. This educative and motivational area received and continues receiving very low attention.

HANDLING OF LIXIVIATES

For the handling of lixiviates, coverings and drainage systems adapted for the land filling were considered, improving significantly the existing situation.

The model considers the treatment of leached waters in an UASB anaerobic system plant.

At the time, the lixiviates were not adequately treated and giving the lack of drainages, treatment facilities, sufficient covering and the type of terrain and the large precipitation in the site, the problem was largely unresolved.

This seems to be still the situation, although some things have been done.

HANDLING OF BIOGASES

For the handling of biogases generated, a model of available energy and gas discharge was generated.

It is a function of time and of the handling of the land fill (related to the amount of deposited organic material, which varied according to the studied alternatives).

A model was included to consider the costs of gathering gases and of taking them to a plant for the generation of energy or to individual chimneys for combustion.

Right now a system is being put into practice, applied to burning the gases to diminish greenhouse gases.

HANDLING OF BIOGASES

A possible thermal plant was considered in some of the alternatives.

A cost model was included to estimate benefits and costs of generating electrical energy from biogas, both for external sale and internal consumption.

Also, taking advantage of the availability of biogas, designs of rotary incinerators of several capacities were made that fulfilled the norms as far as temperatures, time of residence and pollution control.

TRANSPORT AND OPERATION

A model was elaborated to consider the costs of transport of waste to the La Pradera land fill, which is about 70 km from the collection systems in the cities.

That included number of trips, resources, expenses and investments in vehicles and fuel consumptions.

It was complemented with another model to consider the costs of the administration and operation of the land fill, such as excavations, land value, membranes, drainages, gas chimneys and machinery. For this the model the effects of areas, average depths, densities, amounts and types of waste were included.

ALTERNATIVES STUDIED

Alternative 1 The present situation.

In this, there are no programs of recycling or separation in the source, undertaken directly by the organization, although some recycling and separation are under way done by low paid recyclers and some well organized cooperatives.

At the time, a modest organic waste recovery program for elaborating compost was in place.

This alternative does not include a plant for treating lixiviates nor any systems to take advantage of the energy of the gases.


Alternative 2 An improvement on the current situation.

It is an alternative reachable, but implies concerted efforts and intelligence of all the involved sectors, much conscience in the city, leadership in the organization and citizen commitment.

It includes a plant of treatment for lixiviates, a thermal plant to take advantage of the energy of biogases, a rotary incinerator, increasing separation in the source and of recycling programs, with strong educative components and a more intense program of treatment of the organic wastes towards composting.


Alternative 3 A more aggressive approach.

It includes more demanding goals for recycling, treatment of organic and separation in the source.

Treatment of lixiviates

Also using a thermal plant for recovering biogas energy and a rotary incinerator.


Alternative 4 Aggressive education and source management of waste.

It is a situation in which the emphasis is put mostly in recycling, treatment of organic waste and separation in the source.

A lixiviate treatment plant is included.

It does not consider thermal plant nor incineration to take advantage of the biogas energy, which is simply burned.

RESULTS OF THE MODELAlternative 1 2 3 4Situation Actual More

recycling and recovering of biogas

High recycling and high biogas recovery

Very high recycling and no biogas recovery

Waste recycling and separation

No Medium High Very high

Lixiviate plant No Yes Yes Yes

Organic waste treatment

Very low

Medium High Very high

Thermal Plant No Yes Yes No

Incineration No Yes Yes No

Waste generated and treated in 20 years (million tons)

Situation Actual More recycling and recovering of biogas



Total generated waste

19,62 19,62 19,62 19,62

Organic treated 0,27 2,02 3,91 4,85

Recycled or separated

1,90 3,53 4,23

Incinerated 0,38 0,38

To be taken to the landfill site

19,35 15,32 11,80 10,54

Other operation parameters




Open accumulated area in the landfill site (hectares) in 20 years

154 122 95 85

Biogas energy flow (year 20), million Kcal/hr

58 42 25 21

Number of trips carrying waste to the site (thousands) in 20 years

1.962 1.771 1.608 1.539

Directly Employed persons in the programs

875 1.072 1.203 1.177

Costs in 20 years operation (million US $)




Total 528 673 758 770Building and operation of landfill

480 405 340 321

Lixiviate treatment 36,4 9,3 9,2 8,1Operation of recycling plants

25,9 48,2 60,3

Operation of plant to generate electricity

86,9 61,0

Operation of organic composting plants

7,2 49,8 96,5 119,1

Incineration 9,8 9,7 0,0Education and community motivation

4,7 86,4 193,1 261,8

Revenues in 20 year operation (million US $)




Total 1.284 1.483 1.562 1.540Waste collection fees 1.281 1.281 1.281 1.281Recycled material sales

65,3 121,5 151,2

Electricity sales 82,1 63,0 Compost sales 2,4 44,9 86,9 107,7Incineration services sales

9,2 9,2

Results and investment in 20 year operation (million US $)




Net result 756 810 804 770Comparison with actual situation

54,2 48,2 14,7

Net result without considering waste collecting fees

-526 -471 -478 -511

Total investment 38,2 66,6 59,2 49,8New waste carrying vehicles 37,3 21,8 8,5 13,9Plants for recycling and separation

7,8 14,3 14,3

Thermal plant to generate electricity

24,0 13,2

Plants for organics handling 0,8 10,2 20,6 20,6Plant to treat lixiviates 1,3 1,0 1,0Incineration plant 1,4 1,4

ACCUMULATED WASTE TO THE LANDFILL

Fig. 1 Accumulated waste taken to the landfill site

0,0

5,0

10,0

15,0

20,0

2000 2005 2010 2015 2020 2025

Year

mill

ion

tons

Alternative 1, actual Alternative 2, medium recyclingAlternative 3, high recycling Alternative 4, very high recycling

ACCUMULATED LAND FILL SITE AREA

Fig. 2 Accumulated Land fill site area (hectares)

0

40

80

120

160

2000 2005 2010 2015 2020 2025

Year

Are

a (h

ecta

res)

Alternative 1, actual Alternative 2, medium recyclingAlternative 3, high recycling Alternative 4, very high recycling

CONCLUSIONS

Alternatives 2, 3 and 4, that imply programs of separation in the source and treating in some way the waste, are more attractive from the economic point of view that the present situation.

In spite of the apparently high investments, the alternatives that contemplate use of biogas are more attractive than those than do not use it.

It is clear that this is not really an economical problem, but a problem of beliefs and attitudes

CONCLUSIONS

It is important to note that the proposed alternatives, besides being more economical, show also a favorable impact on direct and indirect employment, which is very important for a city like Medellín, subject to difficult unemployment and social problems.

This city has an enormous potential for growth and a real need for improving the quality of life for the people. It should focus correctly its solid waste problems.

It has been shown that alternatives that attack the problem from an integral point of view are more attractive than the current situation. It is necessary that a city of this importance has integral planning for handling this type of problems.

CONCLUSIONS

A beautiful citydeserves loving

care

It is a matter of believing in

brave people like the ones

recycling for us every day

under difficult situations

Thank you very much for your kind attention

Strategic Analysyis Of Alternatives For Waste Management In Valle De Aburrá 2008

Technology

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