sustainable solid waste systems in developing...
TRANSCRIPT
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Sustainable Solid
Waste Systems in
Developing
Countries
By Sandra Cointreau
Solid Waste Management Advisor
The World Bank, Washington DC
February 2006
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Sustainability Needs:
• Well planned and tested solid waste systems --to develop cost effectiveness.
• Attention to social values and needs -- to minimize health concerns and design affordable systems.
• Cooperation and involvement of the people being served.
• Competition, accountability and transparency -- to optimize trust by consumers and encourage private investment.
• Ethical, legal and regulatory frameworks -- to minimize risks to investors.
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First – What are the health
and environmental concerns
that Sustainable Solid Waste
Systems must address?
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Environmental Concerns:
• Greenhouse gases from solid waste activities –Landfills are top source of methane GHG; refuse fleets are significant sources of CO2 and N2O.
• Wasted recyclable materials have lost inherent energy production activities (i.e., CO2 and N2O).
• Volatilized heavy metals (e.g., mercury and lead), dioxins and furans from open burning dumpsites and low-standard incinerators.
• Leachate from unlined and uncovered dumpsites contaminates ground and surface waters.
• Bioaerosols and dust from handling.
• Smoke particulates from open dumping.
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Health Concerns:
• Infection – contact with human fecal matter, blood, and diseased tissue; contact with diseased dead animal matter and manure.
• Animal diseases – foraging of animals/birds at open dumps; recycling of slaughter waste into animal feed.
• Respiratory disease -- particulates and bioaerosols reduce pulmonary function.
• Cancer -- volatilized refractory organics from landfill gases; heavy metals, dioxins and furans from poorly controlled burning.
• Headaches – lack of oxygen and excessive CO from dumpsite decomposition and burning.
• Injury – wounds from sharps, traffic accidents.
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Bombay, India, 1995
Significant contact
during loading, no
shoes or gloves
Tema, Ghana, 1998
Children playing in an
area of uncollected waste
Direct Contact with Waste:
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El Salvador, 1998, Cows and
pigs searching for food
Dominican Republic, 1998,
Pigs living on dumpsites
Animals Raised and Fed on
Raw Waste:
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Dumpsite Linkage to Animal and
Poultry Diseases:• Avian Influenza H5N1–virus in bird secretions and excreta are
long-lived. Present in bedding and slaughter wastes, able to last week. Wild birds are carriers. Humans susceptible through contact and ingestion.
• Encephalopathies (Mad Cow, Sheep Scrapie) -- prion proteins in brain and spinal materials are long lasting, even after thermal processing into animal feed. Humans susceptible through ingestion.
• Cattle, Sheep and Goat Foot-and-Mouth -- virus in secretions and excreta. Present in bedding and slaughter wastes. Dogs, rats, and birds are carriers.
• Bovine TB – bacterium in secretions and excreta. Present in bedding and slaughter wastes. Infective to all mammals.
• Rabbit Viral Hemorrhagic Fever –virus in rabbit blood and excreta. Present in bedding wastes and slaughter wastes, able to last weeks. Surviving rabbits are carriers.
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Bio-aerosol Levels:
• 10-1000 times Higher near the truck loading hopper (Switzerland, Denmark
local studies)
• 2-10 times Higher inside materials recovery plants (USA,
Finland local studies)
• 2-4 times Higher at sanitary landfills (Italy
local studies) Izmir, Turkey,
1994
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Particulates High at Burning
Dumps:
Mauritius, 1998Dominican Republic, 1998
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Pulmonary Function:
• 23% Dumpsite Workers with
Abnormal Pulmonary Function (India
local study)
• 40% Dumpsite Waste Pickers with
Abnormal Pulmonary Function (Thailand
local study)
• 53% Dumpsite Child Waste Pickers
with Abnormal Pulmonary Function (Philippines local study)
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Blood Lead Levels:
• 70% Dumpsite Children Pickers above WHO lead guideline --children pickers mean lead was 2.5 times higher than in control slum children (Philippines local study) Quezon City, the Philippines, 1995
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Intestinal Parasite Infection
Among Waste Pickers:
• 65% incidence in
Bangkok, Thailand
• 98% incidence in
Manila, Philippines (child waste pickers only)
• 97% incidence in
Olinda, Brazil
• 92% incidence in
Calcutta, IndiaBombay, India, 1995
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Slides at Open Dumps:
• Istanbul, Turkey
– 39 killed, 1993
• O Portino, Spain
– 1 killed, 250 evacuated,
1994
• Calcutta, India
– 2 killed, 1992
• Manila, the Philippines
– over 200 killed, 2000
• Bandung, Indonesia
– over 100 killed, 2005
Tashkent, Uzbekistan,
2001
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Second – How do we
achieve cost-effective
technical designs for
Sustainable Solid Waste
Systems?
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Waste Character:
• Vegetable/putrescible material 2-3 times higher --40% to 80% by weight
• Recyclable paper, plastic, metal, glass 2-5 times lower -- 5% to 15%
• Inert fines 2-5 times higher -- 20% to 40%
• Moisture content 2-4 times higher -- 40% to 70%
• Density 2-3 times higher -- 350 to 400 kg/cu.mtr., uncompacted in collection truck
• Calorific values 2-3 times lower -- 800 to 1,300 kcal/kg.
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Waste Differences affect
Technical Choices:• Compaction is not always justified.
• Composting is technically viable, but farmers may not afford to pay the difference in cost above sanitary landfill.
• Sanitary landfill gas generation is technically viable, but gas escapes quickly in warm tropical climates and requires extra investment to contain.
• Incineration is rarely self-sustainable, since supplemental fuel is needed for low-calorie waste.
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Strategic Planning is Essential:
• Collection options vary widely in cost and
quality of service, must fit the local setting
• Transfer facilities can dramatically cut
costs
• Disposal systems have large economies-
of-scale, must fit the local waste character
• Holistic modeling is available to
comparatively assess costs, consumables,
and emissions.
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Collection Vehicle
Types:
• Small – power tiller,
hand cart, mini-truck
• Slow moving – tractor
and trailer, animal cart
• Fast moving – open
tipper truck, rear loader
truck
• Container lifting – roll
on, skip, mechanical
arm for carts
Accra, Ghana, 1997
Kukkattpally, India, 2001
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Collection
Vehicle Types:
Liftable Container, Izmir,
Turkey, 1994
Arm-Roll Container,
Sekondi, Ghana, 1997
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Collection Vehicle Types:
Arm Roll Container,
Ahmedabad, India, 2001
Market Skip Lift Containers,
Tema, Ghana, 1994
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Collection Vehicle Types:
Mini Private Truck,
Bangalore, India, 2001
Open Tipper Lifts Hand
Carts, Hue, Vietnam, 1996
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Cost Comparison of Vehicle TypesSolid Waste Collection Vehicle Costs
in Almaty, Kazakhstan, 2000
0
5
10
15
20
25
30
35
40
5 20 35
km from collection to discharge
co
st
pe
r to
nn
e in
$U
S
LG RL COMP MANUAL 20 LG RL COMP CONTAINERS 20
SM RL COMP MANUAL 10 SM RL COMP MANUAL 10
SM RL COMP MANUAL 10 FARM TRACTOR TRAILER 6
OPEN TIPPER 6
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Crew Size and
System of Loading:
• Vehicle productivity
more important in
LDC’s than worker
productivity
• Arrange crew size to
optimize vehicle
productivity
• Facilitate method of
loading
Bombay, India, 1995
Ica, Peru, 1984
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Crew Size:
Bangalore, India, 2001Izmir, Turkey, 1994
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Crew Size
Comparison:Quito, Ecuador - Comparative Total Cost for Collection
Government - 4 versus 5 man crew - 1998
$0.00
$5.00
$10.00
$15.00
$20.00
$25.00
$30.00
$35.00
$40.00
5 15 30 45
Distance from Route to Disposal (km)
Co
st p
er M
etric T
on
ne
REAR LOADER MANUAL 4-crew 14 OPEN TIPPER MANUAL 4-crew 8.076
REAR LOADER MANUAL 5-crew 14 OPEN TIPPER MANUAL 5-crew 8.076
• 5-person crew
had lower
cost/tonne than
4-person crew
• Larger crew
could load
vehicle faster
and optimize
vehicle
productivity
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Public versus Private Operator:
• Different financing costs
• Different overhead costs
• Different salaries and benefit costs
• Different insurance, tax, registration, and marketing costs (also corruption costs)
• Different length of hours of work and productivity per worker
• Different vehicle availability
• Different accountability – per contractual specifications
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Private Sector Service:
Woman-Owned
Micro-Enterprise,
Quito, Ecuador, 1998
Women-Owned Cooperative,
Kukkattpally India, 2001
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Public versus
Private Costs:Comparison of Private and Government Collection
Costs
$0.00
$5.00
$10.00
$15.00
$20.00
$25.00
$30.00
$35.00
$40.00
5 15 30 45
Distance in Kilometers to Unload
Co
st
pe
r T
on
ne
in
$U
S
REAR
LOADER
Govt 14.0
OPEN
TIPPER
Govt 8.1
REAR
LOADER
Private 14.0
OPEN
TIPPER
Private 8.1
• Total costs for
private versus
public were so
close in Quito, it
was decided to
maintain a balance
of each, and
gradually decrease
government to
about 30% through
natural attrition.
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Transfer
Systems enable
reducing
Collection Haul
Distance,
Vehicle
Emissions and
Costs by 20 To
50 percent.
Solid Waste Collection and Transfer Vehicle
Costs in Trinidad and Tobago, 1999
$0.00
$5.00
$10.00
$15.00
$20.00
$25.00
$30.00
$35.00
$40.00
$45.00
5.0 15.0 30.0 50.0
km from collection to discharge
co
st
per t
on
ne i
n $
US
REAR LOADER MANUAL 10.0 TRANSFER TRUCK TRAILERS 60.0
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Determine Transfer Breakpoints:
• Each type and size
of collection
vehicle has a
different transfer
breakpoint
• Traffic speed
affects the transfer
breakpoint
• Consider transfer
for hauls over 30
minutes
COST ($US/Tonne) FOR COLLECTION AND
TRANSFER SYSTEMS - GOVERNMENT SERVICE -
Georgetown, Guyana- 1999
0
5
10
15
20
25
30
35
40
5 15 30 50DISTANCE ONE WAY TO DISPOSAL
CO
ST
/TO
NN
E (
$U
S)
REAR LOADER
MANUAL 10
TRANSFER
SYSTEM W/
COLL.TRUCKS
TRANSFER
TRUCK W/
FACILITY
TRANSFER
TRUCK 60
TRANSFER
STATION
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Typical 2-Level Transfer
Stations:
Manila, Philippines,
1993
Quito, Ecuador, 1998
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Direct Unloading
to Transfer Truck:
Hyderabad, India, Skip
Container Lift Collection Truck,
Unloads to Open Tipping Truck,
2001
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Unloading to Storage Floor:
Wheeled loader pushes waste into hopper. Knuckleboom crane distributes load.
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Types of Transfer Vehicles:
US, lightweight open topped,
filled by gravity from hopper
US, lightweight, filled by
extrusion from a
compaction chamber
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Transfer Systems:
• Enable implementation of regional Treatment/Disposal facilities that achieve Economies-of-Scale.
• Treatment/Disposal facilities should be at least 300 tonnes/daily shift to have bulldozers, wheeled loaders, windrow turners fully utilized.
• Roads, fences, weighbridges, gatehouses, utilities and maintenance components are fixed costs that should be applied to large waste quantities to lower cost/tonne.
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Landfill Economies-of-Scale:
Landfill Costs - Trinidad and Tobago, 1999
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
Investment Cost/Tonne - Clay and Geomembrane Total Cost/Tonne - Clay and Geomembrane
Co
st
in $
US
/Me
tric
To
nn
e
40 TPD 550 TPD 1100 TPD
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Composting:• Compost plants are
safe and clean and
technically
appropriate for
clean organic
waste
• Product quality is
key to success
• Market demand
may not be
adequate to cover
costsAhmedebad, India, 2001
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Vermi-Composting:
• Requires more land than composting, because piles short.
• It is more sensitive to toxics in waste, and is best done on partially composted waste.
Bangalore, India, 2001
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Neighborhood Composting:
• Lessen the need to
transport waste to
disposal.
• Enable
neighborhood
revenues and
employment.
• Require motivated
public support.
Dakha, Bangladesh,
2001
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Refuse-Derived-Fuel Pellets:
• Limited to dry climates with dry waste.
• Only clean sorted waste can be consolidated into pellets for use as low-calorie fuel.
• Market demand may not be adequate for cost recovery.
Hyderabad, India,
2001
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Materials Recycling at Source:
• Source segregation obtains
cleanest reusable materials.
• Source segregation requires
extra collection systems.
• Registration and route
assignment upgrades the
status and security of waste
pickers.
• Source segregation
minimizes occupational and
environmental health risks.Bangalore, India, 2001
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Protective Gear for Workers:
Khulna, Bangladesh (syringes), 2001 Tema, Ghana, 1998
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Segregate Special Wastes:
• Licensed private operators to safely
handle segregated biomedical
wastes
Hyderabad,
India, 2001
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Third – How do we
arrange financially for
Sustainable Solid Waste
Systems?
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Solid Waste Service is Costly:
• Total cost for solid waste collection,
transfer, and disposal is typically
$40-80/tonne.
• Per capita waste generation is 0.2-0.3
tonnes/year.
• 60-70% of total cost is for collection.
• Full solid waste service requires 1-
2% of GDP.
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Adequate Cash Flow is Essential:
• 50-70% of total cost is for
recurrent expenditure – labor,
fuel, tires, oil, spare parts.
• Labor and fuel are priority
expenditures.
• If there aren’t enough recurrent
funds, spare vehicles are
cannibalized for parts.
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Sources of Capital Funds:
• Municipal bond issues for facilities, including intergovernmental tax credits that recognize externalities.
• Municipal borrowings for vehicles, such as from national development banks.
• Renewal funds replenished by special taxes, user charges, tipping fees.
• Intergovernmental transfers.
• Private sector investment.
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Private Involvement raises
Recurrent Budget Requirements:
• Recurrent budget must be higher to involve the private sector.
• Contractors have to pay monthly for their debt service for investment, and they borrow from short term notes at high commercial interest rates.
• Few municipalities could afford to support private sector investment.
• Mostly old non-specialized private vehicles are hired.
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Some reasons for Limited Progress:
• Public systems improved in 80’s not sustained.
• Development organizations in 90’s reduced
funding, assuming there would be private
investment.
• Investment climate didn’t improve, due to
political intervention in contracting and
contract continuity.
• Municipalities were restricted in the size and
length of contracts.
• Labor laws and unions restricted staffing
reductions to enable private sector service.
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Solid Waste is a Public Good:
• Uncollected and poorly disposed solid waste adversely affects public health and environment.
• All municipal residents and visitors benefit from any solid waste services, regardless of whether they directly participated.
• Excluding some residents from services, adversely affects others.
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Economic Instruments for Regional or
Global Externalities:
• Intergovernmental transfers to upgrade disposal to desired national standards.
• Intergovernmental transfers to encourage compost as a carbon sink and means of upgrading land for agriculture.
• International transfers to encourage emission reductions to reduce climate change.
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Examples of financial transfers:
• USA Superfund to remediate hazardous releases, including qualifying municipal dumps.
– 1980-2005+ Comprehensive Environmental Response, Compensation and Liability Act, and subsequent amendments.
– Funded with taxes on crude oil and certain chemicals, eventually 8.5 $US BB.
– 45,000 sites assessed, about 1,600 placed on National Priority List.
– Private responsible parties sued by Govt. to reimburse the trust.
Source: Francisco Grajales
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Examples of financial transfers:
• Israel Solid Waste Subsidy Program
– 1994-2003 financial support to municipalities.
– Covered 5 years of cost increases for increased
disposal and haulage from implementing
improved new landfills.
– Covered recycling communal bins and a fee
for each tonne of waste recycled.
– Covered half the cost of backyard composting
devices.
Source: Francisco Grajales
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Examples of financial transfers:
• EU funds to upgrade disposal for EU accession countries.
– 2000-5+ Instrument for Structural Polices for Pre-Assession.
– Grants to upgrade infrastructure to meet EU standards, averaging over 1 BB Euros annually.
– Funds up to 75% of landfill civil works investment.
• EU cohesion funds
– 2000-5+ Assists less prosperous member countries to meet EU standards – about 28 BB Euros.
Source: Francisco Grajales
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Examples of financial transfers:
• UK Landfill Tax Credit
– Taxes every tonne landfilled – 50 BB
Pounds/year – mostly funds remediation of
solid waste activities.
– Landfills given exemption for donations to
environmental improvements.
– Similar landfill taxes in France, Italy, and
Netherlands.
• Ireland Recycling Partnership
– 1997 payment for every tonne of packaging
waste recycled – over 60 MM Euros thus far.
Source: Francisco Grajales
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Examples of financial transfers:
• USA Tax Exemptions
– For bond issues for resource recovery plants
– For investment in landfill gas recovery
• Various US States Recycling Subsidies
– 5-15% price preferences for recycled content
• Global Environmental Facility
– funds to promote climate change improvements – 1991-2005+ – ~5 $BB.
• Carbon Finance
– funds to purchase green house gas emission reductions – 2000-2005+ - ~1$BB.
Source: Francisco Grajales
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Examples of possible carbon
finance in solid waste sector*:
• Landfill
methane gas
capture to flare
or recover.
• Composting or
anaerobic
digestion to
avoid landfill
gas.
• Transfer stations
reduce vehicle
emissions from
direct haul by
collection vehicles.
• Recycling captures
inherent energy in
recyclable
materials.
*Note: Bank transaction costs necessitate bundling solid waste
components to meet required 50,000 tonnes/year of CO2 equivalent
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Carbon finance to reduce Green
House Gases:• In past century, GHG’s grew 35%.
• Industrialized countries, with only 20% of world population, contributed over 60% of the GHG’s.
• By 2025, global GHG’s are projected to grow by 57%.
• By 2025, developing country GHG’s are projected to grow by 84%.
• Carbon finance is an international incentive from the original polluters to LDC’s to motivate them to reduce global GHG externalities.
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~41 billion tonnes/yr CO2 equivalent
discharge to atmosphere in 2000:
• ~16% is from methane.
• Methane is 21-25 times stronger as a GHG than CO2.
• World Bank carbon finance pays according to climate change impact.
• Each tonne of methane is paid at 21 times the price of CO2.
• Emission purchase agreements commit to pay for 10+ years from World Bank funds.
• Prices range upwards from 5$/tonne CO2 equivalent, depending on risk.
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Solid waste - one of 3 most fixable
sources of methane:Major Sources of Methane GHG
(~6 billion tCO2e) - % Distribution
0 5 10 15 20 25 30
Natural gas-15% (f ixable)
Solid waste-13% (f ixable)
Coal-8% (f ixable)
Wastewater-10%
Biofuel product ion-4%
Biomass burning-5%
Enteric fermentat ion-28%
M anure-4%
Rice-11%
Source: US EPA year 2000 data
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How do we cover costs for
service benefits occur within
municipal boundaries and
warrant being covered by
municipal revenues?
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Ideally……
• Delegate more authority to
municipalities to
– Raise capital for investments, and
– Establish fees and taxes to cover
recurrent costs and debt service.
• Encourage municipalities to enter
inter-municipal agreements for
specific facilities with economies-of-
scale (~300 tonnes/day for most
facilities…~400,000 residents).
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Cost Recovery is Recommended:
• People are willing to pay for good service.
• Free riders and illegal dumpers are commonly identifiable from papers in their waste.
• Earmarked user charges enable reliable revenues for service delivery.
• Large generators may be influenced by quantity-based charges…polluter pays principle.
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Cost Recovery Mechanisms:
• Property-tax additions for solid
waste.
• User charges attached to water or
electric bills.
• User charges billed separately to all
waste generators.
• Tipping fees at transfer and disposal
facilities.
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Charges are based on City-wide Costs.
• Service to the poor is often more costly – small loads, poor access.
• Value of waste from the poor is less –fewer recyclables, more ash and sand.
• Charges should be proportional to income:
– Property area,
– Water consumption, or
– Electricity consumption.
• Only large generators pay by volume.
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Additional Revenue Sources:
• License fees from private subscription operators.
• Franchise fees for service zones.
• Sales from recyclables, compost and landfill gas.
• Carbon finance from sale of CO2equivalent emission reductions.
• Landfill, environmental, or tourist taxes earmarked for solid waste.
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Conclusions:
•Plan cost-effective technical systems.
•Address all health and environmental issues.
•Develop sustainable financial arrangements.
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http://www.worldbank.org
/solidwaste
http://carbonfinance.org