Waste Water Treatment - Topic 2 - Paper 1

Question 1

Give 3 domestic sources of waste water

Answer 1

Sinks
Showers
Toilets

Question 2

Give 2 agricultural sources of waste water

Answer 2

Nutrient run-off
Animal waste

Question 3

Give 2 things that are removed from domestic and agricultural waste water in treatment

Answer 3

Harmful microbes
Organic matter

Question 4

Give 3 basic stages of sewage treatment

Answer 4

Screening - removal of large objects, e.g. plastic bottles
Sedimentation - letting sewage sit in a settlement tank to separate sludge and effluent
Digestion - anerobic for sludge (to produce methane and fertilisers) and aerobic for effluent (to break down harmful microbes so that water can be released back into the environment)

Question 5

Name 3 sources of water in the UK which can be purified to provide us with potable water

Answer 5

Ground - aquifers (rocks which trap water water underground)
Surface - lakes, rivers and reservoirs
Waste - water which has been contaminated by human processes (e.g. water as a by-product of some industrial processes, perhaps with other chemicals in)