2021-07-22T12:02:41Z
Republic of Ethiopia (2004) EPA Technical guidelines on household waste management.pdf
Republic of Ethiopia (2004) EPA Technical guidelines on household waste management
The Federal Environmental Protection Authority
Technical Guidelines On Households Waste
Management
NOT FOR CITATION
This guidelines is still under development and shall be binding
after consensus is reached between the Environmental
Protection Authority and the Environmental Units of
Competent Sectoral Agencies
2004
Addis Ababa
Ethiopia
SOLID WASTE GUIDELINES, FEPA, 2004 2
Table of Contents
INTRODUCTION.........................................................................................................................1
ENVIRONMENTAL IMPACTS OF HOUSEHOLD WASTE.................................................2
WASTE AVOIDANCE AND MINIMIZATION........................................................................2
SEGREGATION AT SOURCE...................................................................................................3
COLLECTION AND TRANSPORT...........................................................................................3
DISPOSAL OPERATIONS..........................................................................................................4
HOUSEHOLD WASTE MANAGEMENT OPTION................................................................8
Conclusions......................................................................................................................................8
SOLID WASTE GUIDELINES, FEPA, 2004 i
Introduction
Guidelines are preferably set based on country specific baseline information. However, under the
prevailing Ethiopian conditions, the necessary information required for the preparation of the
guidelines is inadequate, outdated and scanty. An alternative approach is to adopt or adapt the
guidelines of international organizations. Accordingly, it has become imperative to adopt and use
the House Hold Waste Management of the United Nation Environment Program.
Therefore, the UNEP guidelines on Household Waste Management is adopted and introduced
throughout the country. The guideline will be amended as more information on the state of
household waste is obtained.
1. Household wastes are not normally regarded as hazardous, since they consist almost entirely
of materials, which have been handled by individuals before being discarded. However, such
wastes can be extremely variable in their composition, depending to a large extent on the
lifestyle of the generator. For example, it can be expected that in the countries where almost
everything bought is associated with wrapping materials, the packaging waste very often
comprises a significant part of household waste. There will also be foodstuffs adhering to it
or unusable material derived from foods preparation, such as vegetable peelings, meat
scrapes and bones, which make it unattractive for recycling. Also present in waste collected
from households are such items as batteries and other electrical components, some of which
may contain mercury, containers in which are present residues of oils, paints, pool chemicals,
caustic materials, sterilizing agents, bleaches, medicines, etc. Although these constitute a
small portion of wastes collected from households, they are particularly problematic due to
their hazardous characteristic, variability in chemistry and associated high recovery costs.
There may be in addition, aerosol canisters, caustic materials, sterilizing agents, bleaches,
medicines, disposable baby’s nappies or diapers, animal faeces and its associated litter along
with discarded foodstuffs which rapidly degrade and become offensive by virtue of their
smell. Such wastes are attractive to vermin, flies and scavenging animals and birds.
SOLID WASTE GUIDELINES, FEPA, 2004 1
For all these reasons there is a need to control and give special consideration to
household wastes and carry out practices, which demonstrate environmentally sound
management. Such wastes could also be generated in offices, commercial establishments,
hotels, etc.
SOLID WASTE GUIDELINES, FEPA, 2004 2
Environmental Impacts of Household Waste
2. Inadequate collection, transport or improper disposal of household waste can
have adverse environmental impacts, such as:
- Air pollution and unpleasant odors;
- Potential health hazards from accumulation of polluted water, which
provide breeding grounds for mosquitoes and attract flies, vermin. Also,
injuries from infected sharps;
- Loss of productive land due to the presence of non-biodegradable items;
1 - Contamination of soil, ground and surface waters by leachate with
resultant environmental effects or health hazards;
Waste Avoidance and Minimization
2
3. One of the leading principles of waste management is the source reduction principle,
by which the generation of waste should be reduced to a minimum in terms of
quantity and/or hazard potential. Therefore, the problems associated with waste
disposal would not be so significant if materials did not need to be discarded as
waste in the first place. The marketing of goods in reusable containers, which could
be returned to the supplier and be reused, is one example. Waste generation could
sometimes be reduced if commodities were available in bulk quantity to a retailer
who would sell the goods in smaller quantities, thereby eliminating the need for as
much packing. Packaging of goods for aesthetic reasons could be discouraged, as
could the supply of a small item in a large package for marketing reasons. Of course
packaging often serves important functions such as controlling spoilage and
otherwise facilitating the distribution and marketing of goods.
SOLID WASTE GUIDELINES, FEPA, 2004 3
SEGREGATION AT SOURCE
4. It is essential to segregate the domestic waste into various components such as
combustibles material, reusable material, recyclable material, organics, etc. at
household level. Combustible material includes paper, cardboard, dry leaves and
twigs. Reusable material could be bottles, cans and plastic bags. Recyclable material
could be paper, plastics, glass and metal scraps. Organic material includes vegetable
and fruit peelings and other food wastes.
5. To promote recovery operations, and to prevent household waste causing pollution or
damage to human health, it is most important to segregate recoverable and hazardous
waste, if present, already at the source of generation. Segregation can also occur
downstream. In developed countries, with possibilities to introduce separate
collection schemes, this is a major challenge in relation to the proper management of
household waste. In developing countries, it is more common practice to separate and
reuse all valuables from household waste.
COLLECTION AND TRANSPORT
6. Households usually keep waste to be discarded in designated containers. These
may be metal or plastic dust-bins or plastic and paper bags. In large buildings and
apartment blocks, centralized containers are sometimes provided into which
occupants place their waste.
7. In cities and urban areas, waste is collected for disposal in specially designated
vehicles fitted with compaction equipment to increase the payload, which can be
transported, often over significant distances to sanitary landfill site.
Recovery Operations
8. The next important principle in respect of waste avoidance and minimization is
recovery of recyclable components to the greatest possible extent.
9. In some developing countries, components of waste streams are usually segregated and
SOLID WASTE GUIDELINES, FEPA, 2004 4
used. Combustibles may be used as fuel either as such, or after densification. Paper
may be used in small-scale paper/cardboard making and plastic wastes can also be
reused in applications not requiring high quality and clean material.
10. The segregation, recycling and reuse of domestic waste is important. Segregation,
recycling and reuse of household waste can have a major impact on the economies of
some developing countries. People involved in waste segregation can be brought into
the formal sector and remunerated for their work. Valuable items, ‘pickings’ can be
sold through intermediaries to small recycling entrepreneurs. The entire recycling
activity, including transportation, generates employment. The economic status of all
those employed in recycling is improved.
11. It is possible to produce compost from the putrescible fraction of household waste.
The waste is piled in a heap formed in rows and the waste is turned over or
windrowed at regular intervals. Also, it is possible to put the sorted waste into a
horizontal perforated drum, resembling a rotary kiln, which has been fitted with flight
tubes and rotate the drum very slowly such that the passage of the waste to the other
end of the drum takes several days. Both these processes rely on aerobic
biodegradation taking place to produce a product resembling compost. The presence
of contaminants both organic and inorganic in compost mainly if it originates from
unsegregated materials can make the compost unusable. Threshold values of
concentrations of such contaminants must be assessed.
DISPOSAL OPERATIONS
12. Historically, household waste has been disposed of by open dump. As communities
became larger and more premises were built, usually at a higher density, particularly
in urban areas, the area needed for the disposal of waste increased. Also, as society
has developed, there have been significant changes in the composition of wastes
collected from households, particularly with a change in the fuel used for heating
purposes. This led to designated areas of land being set aside which became the local
waste disposal site. In addition to decomposition, predators and fires on such sites
reduced the volume of waste considerably. Nowadays, because of ever increasing
volume of waste requiring disposal and an increasing need to protect the
SOLID WASTE GUIDELINES, FEPA, 2004 5
environment, sophisticated means of collection, transport, treatment and disposal
need to be used. At the landfill site, the waste is deposited in layers in prepared cells
and compacted to decrease its volume. It is then covered, at least daily, with a suitable
soil-like material to deter vermin, flies, birds and other scavengers but also to prevent
injuries from sharps.
13. Some biodegradation of the putrescible fraction in the household waste will have
commenced before it was collected and will continue during its transportation. Its
further processing by, for example, wet pulverization also will promote enhanced
degradation. Some countries prohibit the addition of liquids to landfills for the
purpose of accelerating degradation, being more concerned with the increased
production of leachate resulting from such practices. Once in a landfill site the rate of
degradation will increase rapidly, particularly in the presence of moisture. However,
if the density of the waste is increased significantly to assist its handling and
transportation, the ease with which moisture can gain access to the waste mass is
decreased, which can result in a delay in the onset of degradation. Initially, the
degradation is aerobic producing hydrogen and carbon dioxide as the principal by-
products. As the oxygen in the mass of waste is used up, anaerobic conditions become
established and the principal by-products are methane and carbon dioxide. Since
methane is a highly flammable gas and in confined spaces can be explosive, special
measures are needed to vent it from the landfill. At sites where the quantity of landfill
gas produced is significant, harnessing it for use as a fuel is practised. It is possible to
obtain usable gas quantities for several tens of years.
14. At the same time as landfill gas is produced, other organic compounds are formed.
Many of these are soluble in water and become dissolved in any surplus moisture in
the landfill site to produce a liquid mixture termed leachate. Leachate can be highly
polluting. Some countries strike a balance between high volumes of gas production
and low pollution potential of leachate and the reverse to control the pollution by
leachate. In any case it is necessary to prevent leachate migration away from a landfill
site since it can continue to produce landfill gas away from a landfill site. Also, it is
SOLID WASTE GUIDELINES, FEPA, 2004 6
necessary to prevent it from contracting and mixing with ground and surface water.
15. To ensure that waste deposited in a landfill site is more rapidly degraded it can be
pulverized before landfilling. The process is usually carried out under wet conditions
to reduce dust and, since the waste needs to be wet to promote maximum production
of landfill gas, biodegradation occurs quickly after the waste has been landfilled.
16. In parallel with the land filling of household waste, since many of its constituents are
combustible, incineration is another option. Its attraction lies in the fact that large
land areas are not removed from use for other purposes for an indefinite period of
time, and surplus heat can be produced. Because household waste contains a large
variety of materials, including those which are not combustible, plant used to
incinerate such waste needs to be rugged and versatile to cope with a highly variable
feedstock both in terms of waste composition and calorific value.
17. Because the waste is not easy to feed to and through an incinerator it is usual practice
to use furnaces based on either the chain or rocking grate principle or to a lesser
extent a rotary kiln. To ensure high combustion efficiency the temperature range at
which the furnace is operated and burns waste and the time during which the waste
reaches and is maintained at furnace temperature and turbulence within the furnace
chamber, all need to be strictly controlled, the so-called “3Ts Principle” –
Temperature, Time and Turbulence exemplifies this requirement for good
combustion.
18. Waste delivered to an incinerator by a collection vehicle usually discharges its load
into a large hopper from where the waste can then be removed by grab crane or
bucket conveyer and fed to the incinerator furnace at a controlled rate. Ideally, the
furnace should be operated on a continuous basis, thus ensuring that waste is not left
in the hopper for an extended period of time. As indicated above, decomposition of
the waste can take place in the hopper, which rapidly produced hydrogen, methane
and carbon dioxide to give a gas concentration, which is hazardous. Also, it provides
SOLID WASTE GUIDELINES, FEPA, 2004 7
a suitable breeding ground for vermin and particularly flies, the eggs of which will in
all probability have been laid in the waste before it was collected from a household.
19. To meet increasingly more stringent limits on the concentration of gaseous and
particulate emissions released to atmosphere from an incinerator, it is necessary to
clean the off-gases before they are released into the atmosphere. At one time
electrostatic precipitators were considered to provide sufficient removal of particulate
matter in the gas stream. However, to deal with acidic constituents it is necessary to
now use equipment that controls acid gas, such as dry lime injection prior to passing
the gases through an electrostatic precipitator or wet (chemical) scrubbing. In
addition to such control equipment, the height of the chimney from which the gases
are released may need to be increased to aid their dispersion and ensure that ground
level concentrations of constituents in the gases are environmentally acceptable
20. An incinerator, which is operated efficiently, should produce a furnace ash (bottom
ash), which contains only inorganic materials. However, in practice, it can be
expected that also some organic carbonaceous material will be present at trace
concentrations. Normally, the ash is landfilled at a site from which releases of
leachate to ground and surface water are prevented. This is required because any
water-soluble materials in the ash can be dissolved in leachate and could result in
concentrations of pollutants in ground and surface water.
21. In addition to solid wastes, household liquid waste is an environmental problem.
Liquid waste disposed to sewer drains into surface water courses. This causes
pollution of the aquatic environment with resulting health hazards. Therefore
municipal wastewater must be collected and properly treated before discharging to
surface water courses.
Household Waste Management Option
22. It is possible to segregate waste, either with the co-operation of the waste generator or
after collection. Wastes which are not suitable for recovery and hence segregation
SOLID WASTE GUIDELINES, FEPA, 2004 8
will need to be collected and disposed of in approved facilities.
23. The biodegradable fraction contained in wastes collected from households may,
depending on its storage conditions, decompose in its storage container or collection
receptacle. For health, hygiene and aesthetic reasons there has been a move towards
the use of plastic or paper sacks in which the waste is kept to await its collection. At
the same time this means of waste storage is advantageous to those employed in
collecting the waste since then they no longer have direct contact with it. Further, its
subsequent handling, be it at a transfer station, incineration plant or landfill site, will
be easier and more hygienic.
24. In respect of transfer stations, used principally for bulking and packaging wastes for
onward road or rail transport to a disposal facility, in most climates the waste will be
degrading to an extent which will require it to be handled by mechanical means for
health and safety reasons. Likewise, there should be no direct physical contact with
the waste by plant operators at its final destination.
Conclusions
25. Wastes collected from households consist almost entirely of materials which have
been handled by individuals before being discarded, and would not normally be
regarded as possessing hazard properties. However care needs to be exercised over
such materials soon after they are discarded, and are regarded then as wastes, since
hazardous materials may be present in small quantities.
26. The presence of biodegradable constituents in household waste demands care in their
recovery treatment and disposal. Until the pathogens present in the waste have been
either destroyed or die, there is always the possibility of the waste presenting a threat
to human health (toxicity) and the environment (ecotoxicity) by virtue of their
presence.
27. With respect to management of household waste practices may vary place to place.
Care should be taken to ensure compliance with domestic requirements.
SOLID WASTE GUIDELINES, FEPA, 2004 9
28. Problems associated with recovery, treatment and disposal of household waste,
include:
- Lack of available sites for sanitary landfill;
- Inadequate data on type and quantity of waste generated;
- Separate collection and treatment of liquid waste is expensive, and when
disposed of to sewer without treatment can cause harm to the
environment;
- Resides remaining after the treatment of municipal wastes require disposal with particular
care.
SOLID WASTE GUIDELINES, FEPA, 2004 10
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The Federal Environmental Protection Authority
Technical Guidelines On Households Waste
Management
NOT FOR CITATION
This guidelines is still under development and shall be binding
after consensus is reached between the Environmental
Protection Authority and the Environmental Units of
Competent Sectoral Agencies
2004
Addis Ababa
Ethiopia
SOLID WASTE GUIDELINES, FEPA, 2004 2
Table of Contents
INTRODUCTION.........................................................................................................................1
ENVIRONMENTAL IMPACTS OF HOUSEHOLD WASTE.................................................2
WASTE AVOIDANCE AND MINIMIZATION........................................................................2
SEGREGATION AT SOURCE...................................................................................................3
COLLECTION AND TRANSPORT...........................................................................................3
DISPOSAL OPERATIONS..........................................................................................................4
HOUSEHOLD WASTE MANAGEMENT OPTION................................................................8
Conclusions......................................................................................................................................8
SOLID WASTE GUIDELINES, FEPA, 2004 i
Introduction
Guidelines are preferably set based on country specific baseline information. However, under the
prevailing Ethiopian conditions, the necessary information required for the preparation of the
guidelines is inadequate, outdated and scanty. An alternative approach is to adopt or adapt the
guidelines of international organizations. Accordingly, it has become imperative to adopt and use
the House Hold Waste Management of the United Nation Environment Program.
Therefore, the UNEP guidelines on Household Waste Management is adopted and introduced
throughout the country. The guideline will be amended as more information on the state of
household waste is obtained.
1. Household wastes are not normally regarded as hazardous, since they consist almost entirely
of materials, which have been handled by individuals before being discarded. However, such
wastes can be extremely variable in their composition, depending to a large extent on the
lifestyle of the generator. For example, it can be expected that in the countries where almost
everything bought is associated with wrapping materials, the packaging waste very often
comprises a significant part of household waste. There will also be foodstuffs adhering to it
or unusable material derived from foods preparation, such as vegetable peelings, meat
scrapes and bones, which make it unattractive for recycling. Also present in waste collected
from households are such items as batteries and other electrical components, some of which
may contain mercury, containers in which are present residues of oils, paints, pool chemicals,
caustic materials, sterilizing agents, bleaches, medicines, etc. Although these constitute a
small portion of wastes collected from households, they are particularly problematic due to
their hazardous characteristic, variability in chemistry and associated high recovery costs.
There may be in addition, aerosol canisters, caustic materials, sterilizing agents, bleaches,
medicines, disposable baby’s nappies or diapers, animal faeces and its associated litter along
with discarded foodstuffs which rapidly degrade and become offensive by virtue of their
smell. Such wastes are attractive to vermin, flies and scavenging animals and birds.
SOLID WASTE GUIDELINES, FEPA, 2004 1
For all these reasons there is a need to control and give special consideration to
household wastes and carry out practices, which demonstrate environmentally sound
management. Such wastes could also be generated in offices, commercial establishments,
hotels, etc.
SOLID WASTE GUIDELINES, FEPA, 2004 2
Environmental Impacts of Household Waste
2. Inadequate collection, transport or improper disposal of household waste can
have adverse environmental impacts, such as:
- Air pollution and unpleasant odors;
- Potential health hazards from accumulation of polluted water, which
provide breeding grounds for mosquitoes and attract flies, vermin. Also,
injuries from infected sharps;
- Loss of productive land due to the presence of non-biodegradable items;
1 - Contamination of soil, ground and surface waters by leachate with
resultant environmental effects or health hazards;
Waste Avoidance and Minimization
2
3. One of the leading principles of waste management is the source reduction principle,
by which the generation of waste should be reduced to a minimum in terms of
quantity and/or hazard potential. Therefore, the problems associated with waste
disposal would not be so significant if materials did not need to be discarded as
waste in the first place. The marketing of goods in reusable containers, which could
be returned to the supplier and be reused, is one example. Waste generation could
sometimes be reduced if commodities were available in bulk quantity to a retailer
who would sell the goods in smaller quantities, thereby eliminating the need for as
much packing. Packaging of goods for aesthetic reasons could be discouraged, as
could the supply of a small item in a large package for marketing reasons. Of course
packaging often serves important functions such as controlling spoilage and
otherwise facilitating the distribution and marketing of goods.
SOLID WASTE GUIDELINES, FEPA, 2004 3
SEGREGATION AT SOURCE
4. It is essential to segregate the domestic waste into various components such as
combustibles material, reusable material, recyclable material, organics, etc. at
household level. Combustible material includes paper, cardboard, dry leaves and
twigs. Reusable material could be bottles, cans and plastic bags. Recyclable material
could be paper, plastics, glass and metal scraps. Organic material includes vegetable
and fruit peelings and other food wastes.
5. To promote recovery operations, and to prevent household waste causing pollution or
damage to human health, it is most important to segregate recoverable and hazardous
waste, if present, already at the source of generation. Segregation can also occur
downstream. In developed countries, with possibilities to introduce separate
collection schemes, this is a major challenge in relation to the proper management of
household waste. In developing countries, it is more common practice to separate and
reuse all valuables from household waste.
COLLECTION AND TRANSPORT
6. Households usually keep waste to be discarded in designated containers. These
may be metal or plastic dust-bins or plastic and paper bags. In large buildings and
apartment blocks, centralized containers are sometimes provided into which
occupants place their waste.
7. In cities and urban areas, waste is collected for disposal in specially designated
vehicles fitted with compaction equipment to increase the payload, which can be
transported, often over significant distances to sanitary landfill site.
Recovery Operations
8. The next important principle in respect of waste avoidance and minimization is
recovery of recyclable components to the greatest possible extent.
9. In some developing countries, components of waste streams are usually segregated and
SOLID WASTE GUIDELINES, FEPA, 2004 4
used. Combustibles may be used as fuel either as such, or after densification. Paper
may be used in small-scale paper/cardboard making and plastic wastes can also be
reused in applications not requiring high quality and clean material.
10. The segregation, recycling and reuse of domestic waste is important. Segregation,
recycling and reuse of household waste can have a major impact on the economies of
some developing countries. People involved in waste segregation can be brought into
the formal sector and remunerated for their work. Valuable items, ‘pickings’ can be
sold through intermediaries to small recycling entrepreneurs. The entire recycling
activity, including transportation, generates employment. The economic status of all
those employed in recycling is improved.
11. It is possible to produce compost from the putrescible fraction of household waste.
The waste is piled in a heap formed in rows and the waste is turned over or
windrowed at regular intervals. Also, it is possible to put the sorted waste into a
horizontal perforated drum, resembling a rotary kiln, which has been fitted with flight
tubes and rotate the drum very slowly such that the passage of the waste to the other
end of the drum takes several days. Both these processes rely on aerobic
biodegradation taking place to produce a product resembling compost. The presence
of contaminants both organic and inorganic in compost mainly if it originates from
unsegregated materials can make the compost unusable. Threshold values of
concentrations of such contaminants must be assessed.
DISPOSAL OPERATIONS
12. Historically, household waste has been disposed of by open dump. As communities
became larger and more premises were built, usually at a higher density, particularly
in urban areas, the area needed for the disposal of waste increased. Also, as society
has developed, there have been significant changes in the composition of wastes
collected from households, particularly with a change in the fuel used for heating
purposes. This led to designated areas of land being set aside which became the local
waste disposal site. In addition to decomposition, predators and fires on such sites
reduced the volume of waste considerably. Nowadays, because of ever increasing
volume of waste requiring disposal and an increasing need to protect the
SOLID WASTE GUIDELINES, FEPA, 2004 5
environment, sophisticated means of collection, transport, treatment and disposal
need to be used. At the landfill site, the waste is deposited in layers in prepared cells
and compacted to decrease its volume. It is then covered, at least daily, with a suitable
soil-like material to deter vermin, flies, birds and other scavengers but also to prevent
injuries from sharps.
13. Some biodegradation of the putrescible fraction in the household waste will have
commenced before it was collected and will continue during its transportation. Its
further processing by, for example, wet pulverization also will promote enhanced
degradation. Some countries prohibit the addition of liquids to landfills for the
purpose of accelerating degradation, being more concerned with the increased
production of leachate resulting from such practices. Once in a landfill site the rate of
degradation will increase rapidly, particularly in the presence of moisture. However,
if the density of the waste is increased significantly to assist its handling and
transportation, the ease with which moisture can gain access to the waste mass is
decreased, which can result in a delay in the onset of degradation. Initially, the
degradation is aerobic producing hydrogen and carbon dioxide as the principal by-
products. As the oxygen in the mass of waste is used up, anaerobic conditions become
established and the principal by-products are methane and carbon dioxide. Since
methane is a highly flammable gas and in confined spaces can be explosive, special
measures are needed to vent it from the landfill. At sites where the quantity of landfill
gas produced is significant, harnessing it for use as a fuel is practised. It is possible to
obtain usable gas quantities for several tens of years.
14. At the same time as landfill gas is produced, other organic compounds are formed.
Many of these are soluble in water and become dissolved in any surplus moisture in
the landfill site to produce a liquid mixture termed leachate. Leachate can be highly
polluting. Some countries strike a balance between high volumes of gas production
and low pollution potential of leachate and the reverse to control the pollution by
leachate. In any case it is necessary to prevent leachate migration away from a landfill
site since it can continue to produce landfill gas away from a landfill site. Also, it is
SOLID WASTE GUIDELINES, FEPA, 2004 6
necessary to prevent it from contracting and mixing with ground and surface water.
15. To ensure that waste deposited in a landfill site is more rapidly degraded it can be
pulverized before landfilling. The process is usually carried out under wet conditions
to reduce dust and, since the waste needs to be wet to promote maximum production
of landfill gas, biodegradation occurs quickly after the waste has been landfilled.
16. In parallel with the land filling of household waste, since many of its constituents are
combustible, incineration is another option. Its attraction lies in the fact that large
land areas are not removed from use for other purposes for an indefinite period of
time, and surplus heat can be produced. Because household waste contains a large
variety of materials, including those which are not combustible, plant used to
incinerate such waste needs to be rugged and versatile to cope with a highly variable
feedstock both in terms of waste composition and calorific value.
17. Because the waste is not easy to feed to and through an incinerator it is usual practice
to use furnaces based on either the chain or rocking grate principle or to a lesser
extent a rotary kiln. To ensure high combustion efficiency the temperature range at
which the furnace is operated and burns waste and the time during which the waste
reaches and is maintained at furnace temperature and turbulence within the furnace
chamber, all need to be strictly controlled, the so-called “3Ts Principle” –
Temperature, Time and Turbulence exemplifies this requirement for good
combustion.
18. Waste delivered to an incinerator by a collection vehicle usually discharges its load
into a large hopper from where the waste can then be removed by grab crane or
bucket conveyer and fed to the incinerator furnace at a controlled rate. Ideally, the
furnace should be operated on a continuous basis, thus ensuring that waste is not left
in the hopper for an extended period of time. As indicated above, decomposition of
the waste can take place in the hopper, which rapidly produced hydrogen, methane
and carbon dioxide to give a gas concentration, which is hazardous. Also, it provides
SOLID WASTE GUIDELINES, FEPA, 2004 7
a suitable breeding ground for vermin and particularly flies, the eggs of which will in
all probability have been laid in the waste before it was collected from a household.
19. To meet increasingly more stringent limits on the concentration of gaseous and
particulate emissions released to atmosphere from an incinerator, it is necessary to
clean the off-gases before they are released into the atmosphere. At one time
electrostatic precipitators were considered to provide sufficient removal of particulate
matter in the gas stream. However, to deal with acidic constituents it is necessary to
now use equipment that controls acid gas, such as dry lime injection prior to passing
the gases through an electrostatic precipitator or wet (chemical) scrubbing. In
addition to such control equipment, the height of the chimney from which the gases
are released may need to be increased to aid their dispersion and ensure that ground
level concentrations of constituents in the gases are environmentally acceptable
20. An incinerator, which is operated efficiently, should produce a furnace ash (bottom
ash), which contains only inorganic materials. However, in practice, it can be
expected that also some organic carbonaceous material will be present at trace
concentrations. Normally, the ash is landfilled at a site from which releases of
leachate to ground and surface water are prevented. This is required because any
water-soluble materials in the ash can be dissolved in leachate and could result in
concentrations of pollutants in ground and surface water.
21. In addition to solid wastes, household liquid waste is an environmental problem.
Liquid waste disposed to sewer drains into surface water courses. This causes
pollution of the aquatic environment with resulting health hazards. Therefore
municipal wastewater must be collected and properly treated before discharging to
surface water courses.
Household Waste Management Option
22. It is possible to segregate waste, either with the co-operation of the waste generator or
after collection. Wastes which are not suitable for recovery and hence segregation
SOLID WASTE GUIDELINES, FEPA, 2004 8
will need to be collected and disposed of in approved facilities.
23. The biodegradable fraction contained in wastes collected from households may,
depending on its storage conditions, decompose in its storage container or collection
receptacle. For health, hygiene and aesthetic reasons there has been a move towards
the use of plastic or paper sacks in which the waste is kept to await its collection. At
the same time this means of waste storage is advantageous to those employed in
collecting the waste since then they no longer have direct contact with it. Further, its
subsequent handling, be it at a transfer station, incineration plant or landfill site, will
be easier and more hygienic.
24. In respect of transfer stations, used principally for bulking and packaging wastes for
onward road or rail transport to a disposal facility, in most climates the waste will be
degrading to an extent which will require it to be handled by mechanical means for
health and safety reasons. Likewise, there should be no direct physical contact with
the waste by plant operators at its final destination.
Conclusions
25. Wastes collected from households consist almost entirely of materials which have
been handled by individuals before being discarded, and would not normally be
regarded as possessing hazard properties. However care needs to be exercised over
such materials soon after they are discarded, and are regarded then as wastes, since
hazardous materials may be present in small quantities.
26. The presence of biodegradable constituents in household waste demands care in their
recovery treatment and disposal. Until the pathogens present in the waste have been
either destroyed or die, there is always the possibility of the waste presenting a threat
to human health (toxicity) and the environment (ecotoxicity) by virtue of their
presence.
27. With respect to management of household waste practices may vary place to place.
Care should be taken to ensure compliance with domestic requirements.
SOLID WASTE GUIDELINES, FEPA, 2004 9
28. Problems associated with recovery, treatment and disposal of household waste,
include:
- Lack of available sites for sanitary landfill;
- Inadequate data on type and quantity of waste generated;
- Separate collection and treatment of liquid waste is expensive, and when
disposed of to sewer without treatment can cause harm to the
environment;
- Resides remaining after the treatment of municipal wastes require disposal with particular
care.
SOLID WASTE GUIDELINES, FEPA, 2004 10
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