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CONVERSION OF WASTE MATERIAL INTO USEFUL PRODUCTS RECYCLING OF
WASTE
MAJOR SOURCES OF WASTE MATERIAL 1. Municipal sources of waste:
waste from household, different organization, schools, colleges,
other institutions, restaurant & other public places eg.
remnant food, used plastic bottles, plastic/polythene bags, broken
utensils/furniture, old cloths/shoes, food/product packets, used
papers etc. 2. Medical sources of waste: waste from different
health care institute like hospitals, nursing homes involves items
like different expired medicines, operational ingredients, used
needles & syringes, used bandage, blood, pharmaceuticals.
3. Waste from Automobiles: includes exhaust contain various
poisonous gases due to incomplete combustions of petrol in cars.
old not working vehicles are dumped that adds more waste to the
environment. 4. Industrial sources of waste: types of fossils fuel
for energy which produces poisonous smoke containing hydrocarbon
and different Scrap material
5. Construction sources of waste: waste from different
construction activities of building roads involves different
concrete waste, wood, plastic bags of cements & building
materials. 6. Electronic sources of waste: different
electrical/electronic waste that involves TV, computers, vacuum
cleaners, telephones, AC machines etc.
WHAT IS RECYCLING? Recycling is a process in which waste
materials are treated in a way that they can be used again.
Recycling is a key component of modern waste management and is the
third component of the "Reduce, Reuse, Recycle" waste hierarchy.
Recyclable materials include many kinds of glass, paper, metal,
plastic, textiles, and electronics. Materials to be recycled are
either brought to a collection center or picked up from the
curbside, then sorted, cleaned, and reprocessed into new materials
bound for manufacturing.
NEED FOR RECYCLING It reduces the demand up on new resources.
Cuts down the cost and effort of transport and production. Use
waste which would otherwise be lost to landfill sites.
RECYCLING-STEP 1- COLLECTION and PROCESSING: METHODS: -
drop-off centers - buy-back centers -waste collection vehicle
Recyclables are then sent to a material recovery facility to be
SORTED and PREPARED for MANIFACTURING. Recyclables are bought and
sold like any other commodity
RECYCLING-STEP 2- MANUFACTURING More and more of todays
products are made with total or partial recycled content i.e.,
newspapers, paper ,towels, soft drink containers, detergent
bottles, steel cans,etc. Recyclables are also used in innovative
applications such as asphalt, carpeting, benches, pedestrian
bridges
RECYCLING-STEP 3 MARKETING: Buying/Selling recycled products
completes the recycling loop. As consumers demand more
environmentally sound products, manufacturers will continue to
produce high quality recycled products.
SOME EXAMPLES
WATER
FACTS ON RECYCLING WATER Water is a very precious resource and
needs to be used carefully Conserve water in your everyday routine
There are several countries in the world, where people still do not
have clean drinking water Reclaim rainwater Sanitize grey
water
Problem faced by Israel. They are recycling 75% waste water
next to them are spain 12% How to face this problem- Conserving
Recycling desalination
WATER HARVESTING Conscious collection and storage of rainwater
to cater to demands of water, for drinking, domestic purpose &
irrigation is termed as Rainwater Harvesting There are two types of
rainwater harvesting 1.surface run of harvesting 2.Rooftop
rainwater harvesting
USES OF RECYCLED WATER agriculture landscape public parks golf
course irrigation cooling water for power plants and oil refineries
processing water for mills, plants toilet flushing dust control
construction activities concrete mixing artificial lakes
COMMANLY USED CONSTRUCTION MATERIALS Concrete Brick Glass
Asphalt Paving Land Clearing Residuals Wood Gypsum Wallboard
Buildings Metals Roofing(non-asphalt shingles)
CONCRETE: o Concrete is one of the most important construction
material. o Approximately one ton of concrete is used per capita
per year throughout the world. o Recycling of concrete o
irreversible process o crushed into thin particles o mixed as
aggregate
CONCRETE: o Benefits of recycling concrete - Cost of aggregates
Disposal costs Environmental damage Less consumption of natural
resources Valuable landfill space
RECYCLING OF WOOD PRODUCTS
SOURCES OF WOOD WASTE Construction wastes Doors Cupboards Fence
panels & posts Tree branches and green wastes Wooden garden
sheds Furnitures
LAND CLEARING Removal of woods , bushes & grass For
agriculture, urban & other land purposes Trees and bushescan be
recycled as compost or mulch
PROCESS OF RECYCLING Decontamination: Metals, glass, Papers,
Rubbers & Plastic Wood crushing : 1) It reduces the size of
wood into small pieces. 2) Oversize pieces are recirculated fine
particles are obtained.
RECYCLED WOOD PRODUCTS Horse bedding, pet bedding, poultry
bedding Panel boards Play areas Composting Energy production Mulch
and pathway covering BENEFITS: Reduce cutting of new trees
Preserves forests habitats for animals and birds Increase the job
in economy
BRICK: o Broken & discarded brick can be used as
construction infill or as aggregate for non-structural concrete. o
Brick that are part of demolish rubble can be crushed and used in
the same way. o Brick masonry rubble contains mortar upto 20% by
volume. o Crushed brick & roofing tiles are the bulk of
demolition waste which were earlier being dumped in landfills, but
now they can be recycled into mortar plaster & building
blocks.
Brick Recycle clean brick by crushing material. Market outlets
for recycled brick include aggregate, drainage media, and general
fill.
Producing bricks from waste combination of vegetable oil- based
binders which are mixed with waste aggregates. mixture is shaped
into bricks and blocks During the heating process the oil undergoes
a number of complex chemical reactions which transforms it from a
viscous liquid into a solid binding matrix. Producing the products
uses no water, and creates no waste.
Roofing(non-asphalt shingles) Reuse sheathing, terracotta,
slate, or untreated cedar tiles, Metal materials can also be
recycled
GLASS: o One ton of recycled waste glass corresponds to savings
in energy equivalent to 125lit of fuel oil & 1.2tons of raw
materials. o Recycling of glass reduces non-biodegradable glass out
of landfills. o Glass can be used as substitute for Quartz &
Feldspar in the manufacturing of high strength procelain sanitary
ware. o It can also be used to make mineral wool- an insulation
product & in granular form as part of the aggregate in concrete
mixes. o In USA an experiment was conducted on metal free-glass
constituents separated from municipal incinerator residue. This
glass was used to produce brick, glass-wool thermal insulation
& as a major component of a light weight aggregate used in
structural concrete.
PLASTIC: o There is an over abundance of waste plastic. o It is
very difficult to dispose plastics. o Waste plastics can be
shredded & used as filler in other materials such as concrete
& also in construction of roads o House hold plastic waste can
also be recycled to obtain artificial light weight aggregates for
mortar. o Plastics reduces the possibilities of cracking.
Thermoplastics Plastic This material is man made and is a by
product of the oil industry. There are two types of plastic :
Thermosetting
These are described as plastics that can be reformed using heat
: this plastic has a memory, it returns to its original flat shape
when re-heated. Thermoplastics materials thermoplastic resin.
Polypropylene ABS. Acrylic , ABS , Styrene Examples :
Thermosetting materials These are described as plastics that do
not reform using heat, they SET and cannot be reshaped . Melamine ,
Polyester resin ,Urea formaldehyde Here are some examples :
RECYCLED BY Reusing as Bags Pack things with plastic bags
Crafting with Plastic Bags Store perishable food in plastic bags
Reuse them for their initial purpose Make use of plastic bags for
traveling Use plastic bags for household needs
Recycled plastic
RECYCLING - FACTS AND FIGURES Today USA recycles 28 % of its
waste, a rate that has almost doubled during the past 15 years
Recycling of specific materials has grown even more drastically.
42% of PAPER 40% of all PLASTIC soft drink bottle 55% of all
ALLUMINIUM beer and soft drink cans 57%of all STEEL packaging 52 %
of all major APPLIACES are now RECYCLED
CHANGES IN WASTE MANAGEMENT
RECYCLING IS GROWING Twenty years ago only one curbside
recycling program existed in the USA By 1998-9: -9,000 curbside
programs, -12,000 recyclables drop-off centers and - 480 material
recovery facilities had been established in the USA