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chemistry paper 2 > C14-Water treatment in detail > Flashcards

C14-Water treatment in detail Flashcards

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1
Q

what is the first step for treating water from a reservoir

A

sedimentation

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2
Q

what is the second step for treating water from a reservoir

A

filtration

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3
Q

what is the third step for treating water from a reservoir

A

sterilisation

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4
Q

what happens at sedimentation for treating water from a reservoir

A

gets rid of any sediment and large particles

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5
Q

what happens at filtration for treating water from a reservoir

A

removed remaining particles

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6
Q

what happens at sterilisation for treating water from a reservoir

A

kills bacteria and checks ph

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7
Q

what is used in sedimentation to treat water

A

aluminium sulphate and lime

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8
Q

what is used in filtration to treat water

A

special filter made from fine sand

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9
Q

what is used in sterilisation to treat water

A

chlorine

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10
Q

what is stage one of treating waste water

A

screening and grit removal

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11
Q

what is stage two of treating waste water

A

sedimentation

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12
Q

what is stage three of treating waste water

A

anaerobic digestion of sewage sludge

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13
Q

what is stage four of treating waste water

A

aerobic biological treatment for affluent

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14
Q

explain screening and grit removal

A

removes large particles
eg grit

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15
Q

explain sedimentation in waste water

A

allows small particles to sink
forming sewage sludge (sinks) and affluent

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16
Q

explain anaerobic digestion of sewage sludge

A

dried + anaerobically digested

this removes organic matter

can be used for fertiliser or produces biogas for electricity

17
Q

explain aerobic biological treatment for affluent

A

aerobically digested

this removes organic matter and harmful microbes

18
Q

what’s stage 5 of treating waste water

A

disinfectant

19
Q

explain disinfecting

A

by ozone (o3) or UV

chemistry paper 2 (4 decks)

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