Health, Environmental Impact and Reasons for MSWM in Developing Countries
Assessing
the impacts of municipal solid waste management involves consideration
of a large number of components. Health impacts include exposure to toxic
chemicals through air, water and soil media; exposure to infection and
biological contaminants; stress related to odor, noise, vermin and visual
amenity; risk of fires, explosions, and subsidence; spills, accidents and
transport emissions.
Opening dumping:
Fires should
not be tolerated because of the health impacts of inhaling smoke, particularly
the toxic dioxin and furans gases generated by the burning of certain plastics.
The decomposing wastes produce noxious liquid, known as leachate, especially
during rainy seasons. This leachate flows into streams and groundwater
resources, contaminating water supplies. Scavenging at the dumpsite is a
hazardous occupation for the waste pickers, particularly where dangerous
medical wastes (such as blades and items with needles) are mixed with the
general municipal wastes.
Sanitary Landfilling
Health and
social impacts include odor nuisance; ozone formation that can cause pulmonary
and central nervous system damage; fire and explosion hazards from build-up of
methane; an increase in the number of disease vectors (birds, rodents and
insects); and ground and air pollution from leachate and landfill gases. Water
contamination by leachate can transmit bacteria and diseases. Typhoid fever is
a common problem for the people of developing nations because many of them
cannot afford to dig wells deep enough to reach fresh
aquifers. There are also many environmental impacts of
landfills. Ozone formation can cause decreases in crop yield and plant growth
rate. Methane and carbon dioxide are greenhouse gases that contribute to global
warming.
Incineration:
Incineration
impacts society by production of odors. The most important health and
environmental impact is from air emissions, which include particulates, CO, NO2,
acid gases (chlorides and sulfides), volatile organics and mercury. These
compounds contribute to bioaccumulation of toxics and acid rain. Inhalation of
particulate matter poses a health danger.
Composting/Anaerobic Digestion
Health and
social impacts include noise, odor, and unsightliness. Additionally, many of
the microorganisms found in compost are known respiratory sensitizers that can
cause a range of respiratory symptoms including allergic rhinitis, asthma, and
chronic bronchitis. Composting is aerobic and produces primarily carbon
dioxide, while anaerobic digestion produces methane. Both gases contribute to
global warming.
Other risks
Recycling
can also pose health and environmental risks. Sorting facilities contain high
concentrations of dust, bioaerosols and metals. Workers commonly experience
itching eyes, sore throats, and respiratory disease. Environmentally speaking,
recycling uses a large amount of energy resources. For people in developing
countries, bodily wellbeing is a far more pressing concern than the facts that
open burning of garbage contributes to acid rain or global warming. Outrage
over health issues of poor waste management could therefore be a motivating
factor towards more sustainable environmental practices.
Reasons for Municipal Solid Waste Management/ Problem of Municipal Solid Waste
Notwithstanding
the many challenges associated with the above approaches to municipal waste
management, a key question is why at all this is important. Solid waste
management is critical in mitigating risks to public safety, as well as in the
prevention of environmental degradation. Waste is a serious environmental and
health hazard and lead to the spread of infectious diseases. These broad
threats are deemed to be the key reasons for effective municipal solid waste
management:
Disease vectors:
Municipal
solid waste disposed improperly provides the perfect environment for the
breeding of rodents, flies and other vermin. Although detritivores (organisms
that feed on and break down dead plant or animal matter, returning essential
nutrients to the ecosystem. They include micro-organisms such as bacteria, as
well as larger organisms such as fungi, insects, and worms) are essential
organisms for breaking down complex organic materials in the decomposition
process, it is important to manage their population since they contribute to
the spread of several related diseases.
Explosive gases
As garbage
in landfills undergoes microbial decay and other chemical reactions, landfill
gas is produced. Depending on the waste composition and the structure of the
landfill, this gas builds up pressure under the surface, thereby creating a
high incidence of fires and release of toxic fumes. Landfill gas also has
traces of nitrogen, oxygen, water vapour, sulphur and other contaminants. It is
for this reason that solid waste management should be well designed, with
adequate systems for the monitoring and control of the emission of landfill
gases.
Air pollution and other environmental nuisances
Normally it is the wet waste that decomposes and
releases a bad odour. This leads to unhygienic conditions and thereby causes rise
in the health problems. Other than this, co-disposal of industrial/ residential
hazardous waste with municipal waste can expose people to chemical and
radioactive hazards. The generation of toxic emissions may also be a key
contributor to public health risks, and should be controlled as part of the
overall municipal waste management effort.
Landfill gas migration
Gases are extremely mobile once there is nothing to
constrain their movement from an area of high concentration to an area of low
concentration. Landfill gas may therefore migrate to areas in close proximity
to landfill sites, thereby creating potential health hazards such as
respiratory diseases, or even explosive conditions. Moreover, landfill gases
are a significant contributor to greenhouse gas emissions with related
implications for their contribution to global climate change. This issue is
developed further below.
Leachate generation/ Surface and ground water pollution
Leachate is
produced when rainwater percolates with liquids created from decomposing waste
in an anaerobic environment. It has the potential to travel through the soil
layers to the water table, ultimately contaminating groundwater resources
which, in turn, contribute to land-based sources of pollution to the marine
environment. Leachate consists of aromatic hydrocarbons (benzene and toluene),
chlorinated benzenes, volatile halocarbons, phenols, and various carboxylic
acids. These contaminants may cause major public health risks to exposed populations.
Global waste management and climate change
The approach
to waste management around the globe also has a significant impact on global
warming and climate change. This is because a number of waste disposal methods
are themselves significant producers of greenhouse gases (GHGs) which have been
identified as the cause of global warming. While contemporary thinking on
global warming focuses on carbon dioxide (CO2) as the main offender, other GHGs
such as methane (CH4), water vapour (H2O), and nitrous oxide (N2O) are
certainly more important drivers of global warming from a waste management
point of view. It has noted that global waste production was predicted to
double over the next 20 years, driven by increased urbanization and greater
waste generation per capita in emerging economies. This overall increase in the
generation of municipal solid waste globally, along with evolving waste
management strategies, particularly in developing countries, holds the
potential to exacerbate the climate change challenge which confronts humanity
over the medium to long term.
References
- Allende, R., 2009. Waste history in the Gambia. Thesis (MSC). University of the Gambia.
- Kanat G, Demir A, Ozkaya B, Bilgili MS (2006). Addressing the operational problems in a composting and recycling plant. Waste Manage., 26: 1384-1391.
- Haque A, Mujitaba IM, Bell JNB (2000). A simple model for complex waste recycling scenarios in developing economies. Waste Manage., 20: 625-631.
- Nunan F (2000). Urban organic waste markets: Responding to change in Hubli-Dharwad, India. Habitat Int., 24(3): 347-360.
- Schubeler, P., 1996. UNDP/UNCHS (Habitat)/World Bank/SDC Collaborative Programme on Municipal Solid Waste management in Low-Income Countries. Urban management and Infrastructure. Conceptual Framework for Municipal Solid Waste Management in Low-Income Countries. Working Paper No. 9. Available from http://science.jrank.org/pages/7297/Waste-Management.htm
- UN-HABITAT (United Nations Settlements Programme) (2010), “Urban Trends: Urbanization and Economic Growth” UNHABITAT, Kenya.
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