1 / 10

Environmental chemistry

Environmental chemistry. Waste. waste. Outline and compare the various methods for waste disposal. Describe the recycling of metal, glass, plastic and paper products, and outline its benefits. Describe the characteristics and sources of different types of radioactive waste.

anson
Download Presentation

Environmental chemistry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Environmental chemistry Waste

  2. waste • Outline and compare the various methods for waste disposal. • Describe the recycling of metal, glass, plastic and paper products, and outline its benefits. • Describe the characteristics and sources of different types of radioactive waste. • Compare the storage and disposal methods for different types of radioactive waste.

  3. waste disposal

  4. Recycling • Reduces energy cost. • Reduces CO2 emissions. • Reduction in volume of waste. • Saves Earth’s metal ores reserves, trees, crude oil. • Creates jobs in collecting, sorting and recycling

  5. recycling glass • Different glass types must be separated. • Glass is then crushed. • Other substances are removed such as metals, labels. • Glass is melted and remoulded. • Glass can be recycled many times.

  6. metals • Saves Earth’s metal reserves. • Reduces energy costs in extraction (mining, transport and purification). • Collection, sorting and recycling provides jobs. • Many recycled metals are used in alloys.

  7. recycling plastics • Difficult to recycle as there are so many different plastics each needed a different type of recycling. • Main stages: • After collection, manually sorting of different plastics • Washing of plastic • Most plastics melted and then moulded into new shape; • Other first shredded into flakes, then molten and processed into granules or pellets • Future = biodegradable plastics

  8. recycling paper • Water is added to waste paper to make ‘pulp’ and separate fibres • Pulp is centrifuged to remove denser components such as clay, dirt, metals, .. • Air is pumped through it to remove ink • To make white paper it needs to be bleached. • Pulp is compressed to make new paper

  9. radioactive waste - low level

  10. radioactive waste – high level

More Related