Using resources

Question 1

what is sustainable developtment

Answer 1

developtment that meets the needs of current generations without compromising the ability of future generations to meet their own needs

Question 2

in the uk, potable , which is safe to drink is produced by

Answer 2

. choosing an appropriate source of fresh water
.passing the watee through filter beds to remove any solids
.sterilising to kill microbes

Question 3

what are the sterilising agents for potable water

Answer 3

sterilising agents used for potable water include
.ozone
.chlorine
.ultraviolet light

.chlorine is a toxic gas so the amount added to water , has to be monitored
.using ultraviolet light to kill microbes aviods chemicals to the water but is more expensiv e

Question 4

how is desalination carried out

Answer 4

.distillation
.reverse osmosis

.these processes require a large amount of energy

Question 5

what is reverse osmosis

Answer 5

sea water is passed through a membrane that only allows through the water molecules.
.it needs high pressure to push the water through the membrane
.the high pressure required alot of energy to produce
.

Question 6

how is wastewater produced and how is it treated

Answer 6

. urban lifestyles and industrial processes produce large amounts of waste water that require treatment before being released into the environment

.sewage and agricultural waste water requires removal of organic matter and harmful microbes

.industrial waste water may require removal of organic matter and harmful chemicals

Question 7

what are the processes involved in sewage treatment

Answer 7

sewage treatment inculdes=
.screening and grit removal
.sedimentation to produce sewage sludge and effluent
.anearobic digestion of sewage sludge
.aerobic biological treatment of effluent

Question 8

what do new methods of mining aviod in terms of disadvantages of traditional mining

Answer 8

aviods the disadvantages of traditional miming methods of , diggingmoving and disposing of large amounts of rock