Random C10

Question 1

What action helps to save on the large amount of energy required to mine and extract them?

Answer 1

Recycling metals

Question 2

How are waste metals recycled?

Answer 2

Melted down and recast into new products

Question 3

How is Glass Recycled?

Answer 3

Waste glass is separated by colour and chemical composition, to then be crushed and melted for reshaping

Question 4

What else can happen with glass bottles instead of recycling?

Answer 4

Reusing

Question 5

What is potable water?

Answer 5

Safe to drink (filtered)

Question 6

Is potable water chemically pure?

Answer 6

No (contains low levels of dissolved salts and microbes)

Question 7

Ground water comes from underground rocks and must be treated by …?

Answer 7

Filtering and sterilising

Question 8

Salt water comes from sea water and must be treated by…?

Answer 8

Desalination

Question 9

Waste water comes from sewage treatment and agricultural systems, does this require a lot of treatment?

Answer 9

Yes

Question 10

What is the first step in treating ground water?

Answer 10

Removing large organic matter

Question 11

How is large organic matter removed in treating ground water?

Answer 11

Filterbeds (dissolve the insoluble solids)

Question 12

After filterbeds are used, what is used to remove the smaller organic matter (in treating ground water)?

Answer 12

Sand and gravel filtration

Question 13

After sand and gravel, what is done to treat ground water?

Answer 13

Sterilisation

Question 14

How does sterilisation treat ground water?

Answer 14

Kills harmful microbes

Question 15

What is used in the sterilisation of ground water?

Answer 15

Chlorine, ozone or UV (light)

Question 16

What are 2 different methods of Desalination?

Answer 16

•distillation
•Reverse osmosis

Question 17

What type of water is treated with desalination?

Answer 17

Salt water

Question 18

What is the process of distillation (for desalination)

Answer 18

Boil the water to separate it from dissolved salts

Question 19

What is the process of reverse osmosis (for desalination)

Answer 19

Pressure applied to pass water though a partially permeable membrane which filters contaminants

Question 20

What is the issue with both distillation and reverse osmosis for desalination?

Answer 20

Use lost of energy

Question 21

What is the stages of treating waste water?

Answer 21

1)Screening
2)Sedimentation
3)aerobic digestion of organic matter
4)anaerobic digestion of organic matter

Question 22

In treating waste water, what happens in screening?

Answer 22

Organic insoluble matter (e.g. dead/ decaying animal+ plants) is removed

Question 23

In treating waste water, what happens in sedimentation?

Answer 23

Sludge sinks to the bottom while effluent remains

Question 24

In treating waste water, what happens to the effluent after sedimentation?

Answer 24

Digested aerobically -removed organic matter and harmful microbes

Question 25

In treating waste water, what happens to the sludge after sedimentation?

Answer 25

Dried and Digested anaerobically

Question 26

Once effluent is aerobically digested what can happen to it?

Answer 26

Released back to environment

Question 27

Once sludge is anaerobically digested, what can it be used for?

Answer 27

Fertilisation