Waste (also known as rubbish trash refuse garbage junk) is any unwanted or useless materials.
OR
Any materials unused and rejected as worthless or unwanted and A useless or profitless activity using or expending or consuming thoughtlessly or carelessly
3 (No Transcript) 4 INTRODUCTION
Since the beginning Human kind has been generating waste.
It could be in the form of
Bones
Other parts of animals they slaughter
Wood
With the progress of civilization the waste generated became of a more complex nature.
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At the end of 19th century (Industrial revolution) there was rise in the world of consumers.
The increase in population and urbanization was also largely responsible for the increase in solid waste
6 TYPES OF WASTE
Solid Waste
Liquid Waste
Gaseous Wastes
Animal by-products
Biodegradable waste
Biomedical waste
Bulky waste
Business waste
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Chemical waste
Clinical waste
Coffee wastewater
Commercial waste
Construction and demolition waste (CD waste)
Controlled waste
Consumable waste
Composite
8 SOLID WASTE
It is defined as
Non-liquid non-soluble materials ranging from municipal garbage to industrial wastes that contain complex and sometimes hazardous substances
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Solid wastes also include
Sewage sludge
Agricultural refuse
Demolition wastes
Mining residues
10 TYPES OF SOLID WASTE
Broadly there are 3 types of waste which are as follows
Household waste is generally classified as Municipal waste
Industrial waste as Hazardous waste
Biomedical waste or Hospital waste as Infectious waste
11 MUNICIPAL SOLID WASTE
Municipal solid waste consists of
Household waste
Construction and demolition debris
Sanitation residue
Waste from streets.
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With rising urbanization and change in lifestyle and food habits the amount of municipal solid waste has been increasing rapidly and its composition changing.
The existing landfills are neither well equipped or well managed and are not lined properly to protect against contamination of soil and groundwater.
14 (No Transcript) 15 HAZARDOUS WASTE
Industrial and hospital waste is considered hazardous as they may contain toxic substances.
Hazardous wastes could be highly toxic to humans animals and plants. They are
Corrosive
Highly inflammable or explosive
React when exposed to certain things e.g. gases
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Household wastes that can be categorized as hazardous waste include
old batteries
shoe polish
paint tins
old medicines
medicine bottles.
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Hospital waste contaminated by chemicals used in hospitals is considered hazardous.
These chemicals include formaldehyde and phenols which are used as disinfectants.
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In the industrial sector the major generators of hazardous waste are the metal chemical paper pesticide dye refining and rubber goods industries.
Direct exposure to chemicals in hazardous waste such as mercury and cyanide can be fatal.
19 HOSPITAL WASTE
Hospital waste is generated during the diagnosis treatment or immunization of human beings or animals
It may include wastes like
Sharps
Soiled waste
Disposables
Anatomical waste
Cultures
Discarded medicines
Chemical wastes
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These are in the form of disposable syringes swabs bandages body fluids human excreta etc.
This waste is highly infectious and can be a serious threat to human health if not managed in a scientific and discriminate manner
It has been roughly estimated that of the 4 kg of waste generated in a hospital at least 1 kg would be infected
21 SOURCES AND OTHER TYPES OF WASTE 22 (No Transcript) 23 (No Transcript) 24 CAUSES OF SOLID WASTE
The main sources for solid wastes are domestic commercial industrial municipal and agricultural wastes.
The composition of a city waste is as follows
Paper wood cardboard 53
Garbage 22
Ceramics glass crockery 10
Metals 8
Rubber plastics discarded textiles 7
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The increase in the quantity of solid waste is due to
Overpopulation
Affluence (material comfort)
Technological advancement
27 EFFECTS OF SOLID WASTE
a) Health Hazard
If solid wastes are not collected and allowed to accumulate they may create unsanitary conditions.
This may lead to epidemic outbreaks.
Many diseases like cholera diarrhea dysentery plague jaundice or gastro-intestinal diseases may spread and cause loss of human lives.
In addition improper handling of the solid wastes is a health hazard for the workers who come in direct contact with the waste
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b) Environmental Impact
If the solid wastes are not treated properly decomposition and putrefaction (decay) may take place.
The organic solid waste during decomposition may generate obnoxious (intolerable) odors.
29 WASTE MANAGEMENT
4 Rs CONCEPT
Four Rs (Refuse Reuse Recycle and Reduce) to be followed for waste management.
30 REFUSE
Instead of buying new containers from the market use the ones that are in the house. Refuse to buy new items though you may think they are prettier than the ones you already have.
31 REUSE
Do not throw away the soft drink cans or the bottles cover them with homemade paper or paint on them and use them as pencil stands or small vases.
32 RECYCLE
Use shopping bags made of cloth or jute which can be used over and over again.
33 (No Transcript) 34 (No Transcript) 35 REDUCE
Reduce the generation of unnecessary waste e.g. carry your own shopping bag when you go to the market and put all your purchases directly into it.
36 (No Transcript) 37 CONTROL MEASURES
The main purpose of solid waste management is to minimize the adverse effects on the environment. The steps involved are
Collection of solid wastes
Disposal of solid wastes
Utilization of wastes
38 COLLECTION OF SOLID WASTES
Collection of waste includes gathering the waste transporting it to a centralized location and then moving it to the site of disposal.
The collected waste is then separated into
Hazardous
Non-hazardous materials.
39 DISPOSAL OF SOLID WASTES
Before the final disposal of the solid wastes it is processed to recover the usable resources and to improve the efficiency of the solid waste disposal system.
The main processing technologies are
compaction
Incineration
Manual separation.
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The appropriate solid waste disposal method has to be selected keeping in view the following objectives
Should be economically viable
Should not create a health hazard
Should not cause adverse environmental effects
Should not result in unpleasant sight odor and noise
41 UTILIZATION OF WASTES
The solid wastes can be properly utilized to gather the benefits such as
Conservation of natural resources
Economic development
Generate many useful products
Employment opportunities
Control of air pollution
42 SOLID WASTE MANAGEMENT
Waste management is the collection transport processing recycling or disposal and monitoring of waste materials.
The term usually relates to materials produced by human activity and is generally undertaken to reduce their effect on health the environment or aesthetics.
Management is also carried out to recover resources from it. Waste management can involve solid liquid gaseous or radioactive substances
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Waste management practices differ for developed and developing nations for urban and rural areas and for residential and industrial producers.
Management for non-hazardous waste residential and institutional waste in metropolitan areas is usually the responsibility of local government authorities.
Management for non-hazardous commercial and industrial waste is usually the responsibility of the generator.
44 METHODS OF DISPOSAL
Disposing of waste in a landfill involves burying the waste and this remains a common practice in most countries.
Landfills were often established in
Abandoned or unused quarries
Mining voids
Borrow pits
45 A properly designed and well-managed landfill can be a hygienic and relatively inexpensive method of disposing of waste materials 46 INCENERATION
Incineration is a disposal method in which solid organic wastes are subjected to combustion so as to convert them into residue and gaseous products.
This process reduces the volumes of solid waste to 20 to 30 percent of the original volume.
Incineration and other high temperature waste treatment systems are sometimes described as thermal treatment.
47 RECYCLING
Recycling refers to the collection and reuse of waste materials such as empty beverage containers.
The materials from which the items are made can be reprocessed into new products.
Material for recycling may be collected separately from general waste using dedicated bins and collection vehicles or sorted directly from mixed waste streams.
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The most common consumer products recycled include
Aluminum such as beverage cans
Copper such as wire
Steel food and aerosol cans
Old steel furnishings or equipment
Polyethylene and PET bottles
Glass bottles and jars
Paperboard cartons
Newspapers magazines and light paper
Corrugated fiberboard boxes.
49 SUSTANIBILTY
The management of waste is a key component in a business ability to maintaining ISO 14001 official approval.
Companies are encouraged to improve their environmental efficiencies each year.
One way to do this is by improving a companys waste management with a new recycling service. (such as recycling glass food waste paper and cardboard plastic bottles etc.)
50 BIOLOGICAL PROCESSING
Waste materials that are organic in nature such as
plant material
food scraps
paper products
Can be recycled using biological composting and digestion processes to decompose the organic matter
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The resulting organic material is then recycled as mulch or compost for agricultural or landscaping purposes.
In addition waste gas from the process (such as methane) can be captured and used for generating electricity and heat (CHP/cogeneration) maximizing efficiencies
52 ENERGY RECOVERY
The energy content of waste products can be harnessed directly by using them as a
Direct combustion fuel
Indirectly by processing them into another
Type of fuel
There are 2 types of Thermal Treatment
Pyrolysis
Gasification
53 AVOIDANCE AND REDUCTION METHOD
An important method of waste management is the prevention of waste material being created also known as waste reduction.
Methods of avoidance includes
Reuse of second-hand products
Repairing broken items instead of buying new
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Designing products to be refillable or reusable (such as cotton instead of plastic shopping bags)
Encouraging consumers to avoid using disposable products (such as disposable cutlery)
Removing any food/liquid remains from cans
Packaging
Designing products that use less material to achieve the same purpose (for example light weighting of beverage cans).
55 WASTE HANDLING AND TRANSPORT
Waste collection methods vary widely among different countries and regions.
Domestic waste collection services are often provided by local government authorities or by private companies in the industry.
56 TECHNOLOGIES
The waste management industry has been slow to adopt new technologies such as
RFID (Radio Frequency Identification) tags
GPS
Integrated software packages
57 WASTE MANAGEMENT CONCEPT
There are a number of concepts about waste management which vary in their usage between countries or regions.
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Waste hierarchy The waste hierarchy refers to the 3 Rs reduce reuse and recycle which classify waste management strategies according to their desirability in terms of waste minimization.
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Polluter pays principle - the Polluter Pays Principle is a principle where the polluting party pays for the impact caused to the environment. With respect to waste management this generally refers to the requirement for a waste generator to pay for appropriate disposal of the waste.
60 EDUCATION AND AWARENESS
Education and awareness in the area of waste and waste management is increasingly important from a global perspective of resource management. The Talloires Declaration is a declaration for sustainability concerned about the unprecedented scale and speed of environmental pollution and degradation and the depletion of natural resources. Local regional and global air pollution accumulation and distribution of toxic wastes destruction and depletion of forests soil and water depletion of the ozone layer and emission of green house gases threaten the survival of humans and thousands of other living species.
61 SOLID WASTE MANAGEMENT IN PAKISTAN
Solid waste collection by government owned and operated services in Pakistans cities currently averages only 50 percent of waste quantities generated however for cities to be relatively clean at least 75 percent of these quantities should be collected.
Unfortunately none of the cities in Pakistan has a proper solid waste management system right from collection of solid waste up to its proper disposal.
62 URBANIZATION PATTERN
According to the 1981 census of the 5.92 million persons who had migrated within the country 87.6 moved from rural to urban areas while only 12.4 moved in the opposite direction. Over 50 of them permanently settled in cities.
During the last several decades migration has occurred from rural to urban areas. The chief factors responsible for this migration are
Slow progress in the agriculture sector
Low crop yields
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Lack of alternate employment opportunities
Environmental degradation due to water logging/salinity deforestation and desertification
According to a study the selected cities are growing at a growth rate from 3.67 to 7.42 which is much higher than the overall growth rate of Pakistan i.e. 2.8. Major cities in Pakistan are estimated to double their population in next ten years. These cities are generating high amounts of solid waste which is increasing annually with the respective population growth.
64 GROWTH IN SOLID WASTE GENERATION
Presently it is estimated that 54888 tons per day of solid waste is generated in Pakistan. The Ministry of Environment undertook a study during 1996 on Data Collection for Preparation of National Study on Privatization of Solid Waste Management in Eight Selected Cities of Pakistan. The study revealed that the rate of waste generation on average from all type of municipal controlled areas varies from 0.283 kg/capita/day to 0.613 kg/capita/day or from 1.896 kg/house/day to 4.29 kg/house/day in all the selected cities.
Under the recently devolved local government system the Town/ Tehsil Municipal Administration (TMAs) are responsible for the solid waste collection transportation and disposal. However TMAs are unable to cope with continuously increasing volumes of municipal waste due to inadequate funds lack of rules regulations and standards lack of knowhow on the subject lack of expertise and lack of collection vehicles and equipment
68 SOLID WASTE MANAGEMENT POLICY
The Government of Pakistan enacted the Pakistan Environmental Protection Act (PEPA) in 1997 which is the most recent and updated legislation on environment.
It provides a framework for establishing federal and provincial Environmental Protection Agencies (EPAs).
Presently the legal rules and regulations dealing with solid waste management in Pakistan are as follows
69 Current
1 Section 11 of the Pakistan Environmental Protection Act prohibits discharge of waste in an amount or concentration that violates the National Environmental Quality Standards.
2 Draft Hazardous Substances Rules of 1999.
3 Islamabad Capital Territory Bye Laws 1968 by Capital Development Authority Islamabad
4 Section 132 of the Cantonment Act 1924 deals with Deposits and disposal of rubbish etc
5 Provisions contained in the Local Government Ordinance 2001
70 Required
The rules and guidelines that are yet to be introduced include
Basic Recycling rules
Waste Management rules
E-Waste Management rules
Development of Environmental Performance Indicators (EPI)
Eco-Labeling guidelines and its promotion
Adoption of Life Cycle Assessment Approaches
Guidelines for Environmentally Sound Collection and Disposal
Guidelines for model landfill sites
71 CURRENT STATUS OF SWM PRACTICES
Currently solid waste in Pakistan has not been carried out in a sufficient and proper manner in
Collection
Transportation
Disposal or dumping regardless of the size of the city.
These aspect may include
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Rate of urbanization
Pattern and density of urban areas
Physical planning and control of development
Physical composition of waste
Density of waste
Temperature and precipitation
Scavengers activity for recyclable separation
The capacity
Adequacy and limitations of respective municipalities to manage the solid waste.
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According to the 1998 census of the 130.579 million persons living in Pakistan 67 live in rural areas while 33 live in urban areas. Furthermore out of 33 of persons living urban areas 54 of them live in ten major cities of Pakistan. During the last several decades migration has occurred from rural to urban areas. The major factors responsible for this migration are
Slow progress in the agriculture sector
Low crop yields
Lack of alternate employment opportunities
Environmental degradation due to water logging/salinity
Deforestation and desertification.
74 POPULATION AND HOUSEHOLD ESTIMATES
The number and growth of population and households is the foremost factor affecting the solid waste and its management at various stages.
The selected cities are growing at a rate ranging between 3.67 to 7.42 which is much higher than the overall growth rate of Pakistan i.e. 2.8 (EPMC 1996).
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Major cities of them are estimated to double their population in next ten years.
The numbers of households also play an important role in generation and collection of the solid waste.
The average household size in the selected cities varies from 6.7 to 7.3 persons.
76 WASTE GENERATION AND COLLECTION ESTIMATES
The average rate of waste generation from all type of municipal controlled areas varies from 1.896 kg/house/day to 4.29 kg/house/day in a few major cities.
It shows a trend of waste generation wherein increase has been recorded in accordance with citys population besides its social and economic development.
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In Pakistan solid waste is mainly collected by municipalities and waste collection efficiencies range from 0 percent in low-income rural areas to 90 percent in high- income areas of large cities.
Collection rate of solid waste by respective municipalities ranges from 51 to 69 of the total waste generated within their jurisdiction.
78 PHYSICAL COMPOSITION OF WASTE
The move from landfill-based to resource-based waste management systems requires a greater knowledge of the composition of municipal solid waste. Solid waste in Pakistan is generally composed of three categories i.e.
Biodegradable such as food waste animal waste leaves grass straws and wood.
Non-biodegradable are plastic rubber textile waste metals fines stones and
Recyclable material includes paper card board rags and bones.
79 WASTE TREATMENT AND DISPOSAL
The waste is disposed off within or outside municipal limits into low lying areas like ponds etc without any treatment except recyclable separation by scavengers. The land is also hired/leased on long term basis for disposal. Moreover the least mitigating measures have also never been reported from any municipality. Treatment and disposal technologies such as sanitary land filling composting and incineration are comparatively new in Pakistan
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Crude open dumping is the most common practice throughout Pakistan and dump sites are commonly set to fire to reduce the volume of accumulating waste. At present there are no landfill regulations or standards that provide a basis for compliance and monitoring but national guidelines for these standards are being prepared by the Consultant under National Environmental Action Plan Support Program (NEAP SP).
81 CONCLUSION
The overall conclusion of the study on present status of solid waste management in Pakistan as follows
1.There is a limited focus on control mechanisms which is adversely effecting on safety health and the environment.
2.Regulations are inadequately enforced and SWM does not seem to be a priority.
3.None of the cities has an integrated solid waste management system
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Collection rate 5 1-69 of total waste generated.
Hospital and industrial wastes are treated as ordinary waste
A lot of potential for recycling and involvement of private sector which is overlooked
No disposal facilities
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Open burning of waste or open disposal is most common practice.
No weighing facilities are installed at any disposal sites
Open burning of non-degradable components like plastic bags are adding to air pollution
Much of the uncollected waste poses serious health hazards
84 RECOMMENDATIONS
Following recommendations are proposed for sustainable SWM
1.The involvement of people and private sector through NGOs could improve the efficiency of SWM.
2.Public awareness should be created especially at primary school.
3.Littering of SW should be prohibited in cities towns and urban areas.
4.Moreover house-to-house collection of SW should be organized
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The collection bins must have a large enough capacity to accommodate 20 more than the expected waste generation in the area.
Municipal authorities should maintain the storage facilities to avoid unhygienic and unsanitary conditions.
Proper segregation would lead to better options and opportunities for scientific disposal of waste.
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An open dump or an uncontrolled waste disposal area should be rehabilitated. It is advisable to move from open dumping to sanitary land filling in a phased manner.
Land filling should be restricted to non-biodegradable inert waste and other waste that are not suitable either for recycling or for biological processing
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