Waste Water treatment

Question 1

What are the 3 places there can be waste water from and examples

Answer 1

Domestic - showers
Agricultural - nutrient run off/animal feces
Industrial - chemical from factories

Question 1

What two things do we do with waste water

Answer 1

treat it so it can be:
reused
replaced into natural water sources

Question 2

What is the first step in treating waste water

Answer 2

screening to remove the large solids in the waste water

Question 3

After screening where does the waste water go

Answer 3

It goes into the primary sedimentation tank where organic waste sinks to bottom and lighter part stays on top

Question 4

What are the names given to the heavier part and lighter part of the waste in primary sedimentation tank

Answer 4

heavy = sludge
light = effluent

Question 5

Once the slude and effluent parts are seperated what happens differently in their treatment

Answer 5

In sludge it is sealed away and bacteria anaerobically digest sludge

In effluent bacteria aerobically digest harmful microbes whilst O2 is pumped in

Question 6

After sludge is anaerobically digested what happens to it

Answer 6

methane produced is used for fuel
rest is used as fertiliser

Question 7

After effluent is aerobically digested what happens to it

Answer 7

final settling tank gets rid of bacteria then it’s slung back into nature