Sewage treatment Flashcards
(4 cards)
1
Q
Stages of Sewage Treatment
A
Primary (Physical)
Secondary (Biological)
Tertiary (Chemical)
2
Q
Primary(Physical)
A
Large solids are removed by screening
Smaller solids are removed by settling
3
Q
Secondary(Biological)
A
Active sludge process. Bacteria is added and stirred and aerated. Waste is digested by bacteria.
4
Q
Tertiary (Chemical)
A
Nitrates and Phosphates are removed
Nitrates removed by using denitrifying bacteria
Phosphates are removed by perpetration reactions
