Other

Question 1

Membrane

Answer 1

Pressure driven
Micro and ultra
Can get build up or scaling, need to be maintained and replaced regularly

Question 2

Mechanical

Answer 2

1. Sand filters
   Can add coagulants (alum) to lower DOC
2. Carbon filters - can be good for odours. Not effective for inorganics
   ALL need to be replaced/ maintained regularly!

Question 3

Reverse osmosis

Answer 3

Removes everything
Expensive
Needs maintenance
Some don’t like taste

Question 4

UV

Answer 4

Kills bacteria etc
No dbp s
Only works in clear non turbid water
No residual means lines can get build up/ contamination

Question 5

Steps in water treatment plant

Answer 5

1. Coagulation
2. Floculation
3. Sedimentation
4. Filtration
5. Disinfection
   ( small systems only use 4 and 5)

Question 6

Requirements of a well

Answer 6

Secure well cap with at least 1 foot above ground
Well ID plate
Grading around wellhead to prevent ponding
Surface seal
Well screen
Can excavate without permit if less than 15 m

Question 7

Components of multi barrier system

Answer 7

Source selection
Risk analysis
Adequate Treatment
Monitoring
Document
Report