waste water treatment

Question 1

sources

Answer 1

domestic
- showers, toilets
agricultural
- nutrient run off , animal waste
industrial
- chemicals from factories

Question 2

Domestic and agricultural

Answer 2

remove harmful microbes and organic matter
-they pollute fresh water
-can cause health risks

Question 3

induatrial

Answer 3

often contains harmful chemicals
- extra steps required to remove them

Question 4

sewage treatment

Answer 4

screening-removes large things
let sit in sedimentation tank- sludge settles and left w effluent, lighter things at top of tank
break down organic matter- biological breakdown by microorganisms

Question 5

sludge

Answer 5

sealed in tank
microorganisms digest anaerobically
produce methane which is collected and burned as fuel
rest of sludge is used as fertilser

Question 6

effluent

Answer 6

digested in aerobic conditions
air pumped in to tank to provide oxygen to bacteria
creates safe water
can be released back into environment