- Created by: abbiedye
- Created on: 27-07-18 10:26
What are natural resources?
- They come from the earth, sea, and air
- They form without human input and can be replaced or improved
- They can be renewable or non-renewable
What is sustainable development?
- An approach to development that takes account of the needs of present society while not damaging the lives of future generations
Extraction of copper from low-grade ores
- Bioleaching - bacteria
- Phylomining - plants in soil that contain copper
How can metals be recycled?
- Mining and extracting metals takes lots of energy - fossil fuels
- recycling = less energy and melting and casting
How can glass be recycled?
- Glass bottles can often be reused without reshaping
- Recycled glass is organised into colours and chemical composition and is then crushed and melted
What is a Life Cycle Assessment (LCA)?
- Getting the Raw Materials
- Manufacture and Packaging
- Using the Product
- Product Disposal
What is potable water?
- Water that has been treated or is naturally safe for humans to drink
How can potable water be treated?
- The process of treatment depends on where you are
- Filtration - a wire mesh screens out large twigs and then gravel and sand beds filter out any other solid bits
- Sterilisation - the water is sterilised to kill any harmful bacteria or microbes
Where does waste water come from?
- Agricultural systems
- Industrial processes
- Organic matter
What is the process of sewage treatment?
aerobic digestion anaerobic digestion
released back into environment natural gas fertiliser