Chapter 13, 14, 15Sci207

Chapter 13, 14, 15Sci207 - Chapter 13, 14, 15 Chapter 13...

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Chapter 13, 14, 15 Chapter 13 Questions 5,6,10 and Discussions 1 and 2 Q. 5. List some benefits and drawbacks of recycling wastes. What are the major types of materials recycled from municipal waste, and how are they used. Some benefits of recycling waste are that almost everything these days can be recycled, making it a profitable business. Trees are recycled to make mulch, mixed materials are sorted into recyclable glass, plastics, and metals. The drawbacks of recycling waste are; collecting it from everywhere and bringing to the recycling center, which costs gas; the items have to all be sorted and separated, they all have to be cleaned and then processed to make new materials. All of this cost money and sometimes the drawbacks outweigh the benefits. The major types of materials recycled from municipal waste are household garbage and commerical garbage, such as construction debris is sorted and ground, broken drywall is ground and sold to drywall makers. Organic wastes, like food soaked paper is brought to a gassifer where it is cooked in an oxygen free pressure cooker, which converts it into natural gas. Plus, animal by-products, sewage sludge, shredded tires and other wastes can be converted with 85 percent energy efficiency. Q. 6. What is e-waste? How is most of it disposed of, and what are some strategies for improving recycling rates? E-waste is electronic waste, such as computers, monitors, printers, cell phones, cd and dvd players, fax machines, and any other electronic item. It must be disposed of very carefully. Until recently, the U.S. shipped our e-waste overseas to China and they broke it apart to find valuable metals and copper. This is not a careful way because people are being subjected to all kinds of soil, groundwater, and surface contaminants. Some strategies for improving recycling rates, are to simply reduce the amount used. Another way would be to make it mandatory, like batteries which has a 100 percent recycling rate, because it is law. If it was law that everyone had to recycle, I am sure there would be a lot more items recycled than there are right now. Q. 10. What are bioremediations and phytoremediation? What are some advantages to these methods? Biorecediation is the clean up of hazardous waste. Some advantages are that toxic chemicals can be reduced and converted to a safer form. Poplar trees can absorb and break down toxic organic chemicals. Phytoremediation is the clean up process of hazardous waste by way of plants. Advantages are that plants are used ot extract lead, zinc, and other metals from contaminated soil. Radioactive minerals like strontium and ceslum have been extracted near Chernobyl using common sunflowers. D. 1. If local people choose immediate survival over long-term health, should we object or
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Chapter 13, 14, 15Sci207 - Chapter 13, 14, 15 Chapter 13...

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