Laboratory safety- Exit Card - PowerPoint PPT Presentation

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Laboratory safety- Exit Card

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  1. Laboratory safety- Exit Card • Do’s (you must have ATLEAST 4 in this column) • Do not’s (you must have ATLEAST 4 in this column)

  2. Steps to guide you through. • Find your team members and sit at a lab table. • ONE person from your team come get your questions and a piece of paper. • Write all your names at the top of the paper and answer the questions on the sheet of paper. • YOU HAVE 20 minutes for this assignment! • HINT: one group member can use a phone as a reference. • Chapter 19 page 304 Do now- Collaborative activity

  3. Environmental Science Chapter 19 Pages 304-317 Land Pollution

  4. Humans produce lots of solid waste. Disposing waste has been a problem since ancient Greece. Solid waste thrown into streets caused outbreaks of deadly diseases (cholera, typhoid). Water was contaminated with waste (water pollution). Land contaminated with waste (land pollution). NYC: waste thrown into streets then dumped into the Atlantic Ocean 19.1 Solid Waste

  5. Solid waste

  6. Landfill Problems: Space for waste in landfill is limited. Waste leads to populations of rats, flies, cockroaches. Decaying waste produce incredibly bad odors and methane gas (think the Meadowlands on a really hot day). Rain and snow carry pollutants from the landfills into the soil and water around the landfills (leaching). 19.1 Solid waste

  7. Nj Meadowlands landfill

  8. Landfill diagram

  9. Journal: tell me what you think.

  10. Layers of clay, thick plastic liners to prevent leaching. Compacting waste very tightly to put more into the same space. Planting grass and trees on top of closed landfills. (Mount Trashmore, Virginia Beach) Pipes that allow methane gas to escape from the landfill. (Bioreactors) landfill solutions

  11. What are solid wastes? List three different ways humans have used to dispose of solid wastes. What effects do you think the Meadowlands landfill has on organisms in the wetlands and Newark Bay? Hw: section review

  12. What is a superfund site? • List and describe 3 types of waste. Here is 1 to get you started… • 1. corrosive Hw: looking ahead

  13. Hazardous wastes: any solid liquid or gas that even in small amounts can be harmful to humans. Industrial wastes are classified by the Environmental Protection Agency (EPA). 19.2 Hazardous Wastes

  14. Reactive Wastes – can explode (metal form of sodium, gunpowder, gas, oil, propane) Corrosive Wastes – can eat through steel (concentrated acids, lye, batteries, bleach) Ignitable Wastes – can burst into flame at low temperatures (paint thinners, oil, cleaning fluids) Radioactive Wastes – radiation releasing compounds (mining, medical, scientific research) Medical Wastes – (used syringes, blood and tissue samples, old medicines) 19.2 Classifications

  15. Love Canal, Niagara Falls, NY – Hooker Chemical Company began dumping toxic chemical wastes into the Love canal in 1940’s. In 1953 the company sold the land to the town for a school and housing. 56% of all children had birth defects. 900 families effected. First Superfund cleanup site. 80+ toxic chemicals found 19.2 Toxic Waste Spills

  16. Cornell-Dubilier Electronics Company, South Plainfield, NJ 19.2 Superfund sites

  17. Electronics company in South Plainfield, NJ from 1936-1962. Dumped chemicals (PCB’s, TCE, metals and volitles) into the soil around the factory. 8,700 people live within 1 mile of the site. The toxic chemicals were found in nearby homes and businesses. Fish from the Bound Brook also showed high levels of the same chemicals. In 1998, the EPA placed this site in the SuperFund for immediate cleanup. The cleanup and monitoring is still going on today. 19.2 Cornell-dubilier superfund site

  18. Loss of the top layers of soil is known as erosion. Areas where deserts meet grasslands can be lost through process called desertification. Clearing forests, overgrazing of livestock, water loss and bad farming can all cause top soil loss. 19.3 Topsoil erosion

  19. 19.3 Soil erosion Drought/overgrazing Deforestation Desertification Bad Farming practices

  20. Strip-cropping divides fields into strips that are plowed alternating with strips that are planted. Contour farming follows the natural rise and fall of the fields leaving spaces between rows to collect water. Terraces or platforms built into the side of a very steep hill slowing water flow and soil loss. Shelter belt or windbreaks slow down wind erosion. 19.3 Contolling Soil Erosion

  21. 19.3 Controlling soil erosion Contour farming Strip-cropping Shelter Belts Terracing

  22. Problem: Disposable items makeup ¼ of landfills. (paper towels, paper plates) Solution: Substitute reuseable or recycled items (washable cloth towels, china plates) Recycling paper, metal, glass, cardboard. Biodegradable items decompose easily and enrich the soil. Compost tree, grass clippings and other plant materials. 19.4 Controlling lAND POLLUTION

  23. 19.4 Disposable Solutions

  24. Waste Exchange – hazardous waste from one company is collected by a waste exchange agency to be used by other companies to make their products. Deep-well Injection – hazardous waste from oil drilling is injected deep into the earth. Secure chemical landfill – hazardous waste is sealed in a deep pit dug into bedrock. Pipes are used to collect collect any leaked materials. 19.4 disposing hazardous waste

  25. Controlled Incineration – hazardous wastes are burned at very high temperatures (542-1662oC) This method was used for most of the contaminated soil in South Plainfield, NJ Chemical/Biological treatment plants - some hazardous waste can be neutralized by treatment. Radioactive disposal – sealed in steel drums encased in concrete then placed under water in deep vaults. 19.4 Hazardous waste disposal

  26. EPA (Environmental Protection Agency) was created in 1970 to protect the environment. • Superfund Act (1980): • Cleanup hazardous waste dumps • Make the polluters responsible pay for cleanup • Develop a list of the worst sites • Emergency action in the case of spills 19.4 Environmental Legislation