C10 Flashcards
How do we purify groundwater?
Passes through filter - mud and grit
Passes through a screen - large objects
Settlement tank - sand and soil settle out
Aluminium sulphate and lime are added to water
Small particles of dirt clump and sink to bottom
Sludge is collected and dumped in landfill sites
Chlorine is added to kill bacteria
pH is checked that it is neutral
Stored in tanks and service reservoirs
How do we purify sea water?
Distillation
Desalination by reverse osmosis
How do we treat sewage water?
Screening
Sedimentation to produce sewage sludge and effluent
Anaerobic digestion of sludge
Aerobic biological treatment of effluent
What is the required practical extracting method?
Weigh evaporating dish
Add measured volume of water
Heat to evaporate eater then reweigh
Subtract mass of dish from mass leftover
Repeat and calculate a mean
What is bioleaching?
Uses bacteria to extract copper metal
Solution of copper ions is obtained from waste copper ore
Scrap ions and electrolysis is used to extract copper from copper ions
What is phytomining?
Uses plants that can absorb copper ions
These plants are grown on soil containing low-grade copper ore
Plants are burnt and copper is extracted from the ash
Scrap ions and electrolysis is used to extract copper from copper ions
What are the steps to the LCA?
Extracting raw materials
Manufacturing and packaging
Use and reuse
Disposal
How do we recycle aluminium cans?
Separated from other materials
Shredded
De-coated
Furnace
Cooled by water
Block is formed
Rolled into thin sheets ready to be made into new cans
How do we recycle steel?
Separated
Melted
Formed into slabs
Rolled into thin sheets to be Mae into tins again
