23-12-2012, 06:28 AM
hi !!. it is to ask help to display display review literature on paper recycling process!
23-12-2012, 06:28 AM
hi !!. it is to ask help to display display review literature on paper recycling process!
24-12-2012, 12:31 PM
to get information about the topic "recycling of papers" FULL REPORT PPT AND RELATED TOPIC refer the link bellow
https://seminarproject.net/Thread-recycling-of-paper https://seminarproject.net/Thread-recycl...per?page=2
27-06-2013, 04:04 PM
RECYCLING OF PAPER RECYCLING.pptx (Size: 386.34 KB / Downloads: 57) Introduction To produce each week's Sunday newspapers, 500,000 trees must be cut down. If you had a 15-year-old tree and made it into paper grocery bags, you'd get about 700 of them. A busy supermarket could use all of them in under an hour! Each ton (2000 pounds) of recycled paper can save 17 trees, 380 gallons of oil, three cubic yards of landfill space, 4000 kilowatts of energy, and 7000 gallons of water. This represents a 64% energy savings, a 58% water savings, and 60 pounds less of air pollution! The construction costs of a paper mill designed to use waste paper is 50 to 80% less than the cost of a mill using new pulp. The 17 trees saved (above) can absorb a total of 250 pounds of carbon dioxide from the air each year. Burning that same ton of paper would create 1500 pounds of carbon dioxide. Recycling a single run of the Sunday New York Times would save 75,000 trees If all our newspaper was recycled, we could save about 250,000,000 trees each year! Why are trees important? Trees are important to people and our environment in many ways. They provide precious habitat for birds, squirrels, insects, and other creatures and shade And trees remove carbon dioxide from the air while adding valuable oxygen to our atmosphere. Wood is used for building materials and furniture, and wood fiber is made into paper products. Even wood chemicals are valuable. These natural oils and resins are used to make products we all rely on, such as medicines (like asthma and cough remedies), detergents, cosmetics, vitamin tablets, soap, roofing shingles, food flavorings, and toothpaste! Sorting Successful recycling requires clean recovered paper, so you must keep your paper free from contaminants, such as food, plastic, metal, and other trash, which make paper difficult to recycle Contaminated paper which cannot be recycled must be composted, burned for energy, or land filled. Recycling centers usually ask that you sort your paper by grade, or type of paper. Your local recycling center can tell you how to sort paper for recycling in your community. Collection and Transportation You may take your sorted paper to a local recycling center or recycling bin. Often, a paper stock dealer or recycling center will collect recovered paper from your home or office. Your local dealer can tell you the options available in your community. At the recycling center, the collected paper is wrapped in tight bales and transported to a paper mill, where it will be recycled into new paper Re-pulping and Screening The paper moves by conveyor to a big vat called a pulper , which contains water and chemicals. The pulper chops the recovered paper into small pieces. Heating the mixture breaks the paper down more quickly into tiny strands of cellulose(organic plant material) called fibers. Eventually, the old paper turns into a mushy mixture called pulp. The pulp is forced through screens containing holes and slots of various shapes and sizes. The screens remove small contaminants such as bits of plastic and globs of glue. |
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