waste water treatment Flashcards
1
Q
what does waste water contain
A
large amount of organic molecules
harmful microorganisms
2
Q
how to treat water
A
- screened by passing through a mesh
- settles in sedimentation tank
- remove sludge and digested by anaerobic bacteria
- air bubbles through liquid effluent
- discharged into a river
3
Q
what does leaving water to settle in sedimentation tank produce
A
produces liquid effulent and semi solid sludge
4
Q
what is sludge used for
A
fertilisers
5
Q
what happens to water from industries
A
harmful chemicals removed
enter general sewage treatment
6
Q
how else can you get potable water
A
ground water from aquifers
