Waste Water Flashcards
1
Q
Describe waste water
A
Contains very large amounts of organic molecules
Eg urine and faeces
2
Q
First stage of waste water treatment
A
Sewage is screened by passing through a mesh
= removes solids and prices of grit
3
Q
Second stage
A
Sewage can settle in large sedimentation tanks
= produces liquid effluent and semi solid sludge which sinks
Sludge is taken away and digested by anaerobic bacteria
4
Q
What happens when no oxygen
A
Bacteria produces biogas
= can be burned for electricity
