C4 Separation Techniques - The Four National Taps

Only some living things need water to survive.

• True

• False

Singapore is a small country but we have a lot of space to collect and store water.

• True

• False

Singapore must have a ......... water supply to meet our national needs.

• temporary

• reliable

• extra

Rainwater is collected through a network of drains, canals and r........

Rainwater from local catchment and imported from Johor must be chemically treated, ......... and disinfected.

• filtered

• boiled

• evaporated

The National Taps are water from local catchment, imported water, NEWater and .......

• waste water from industry

• desalinated water

• water from Johor

The three step process to obtain treated used water in NEWater plants are microfiltration, reverse osmosis and ………….

• distillation

• ultraviolet disinfection

• evaporation

In the NEWater production, the water is first purified using microfiltration. What substance(s) is(are) removed ?

• Microscopic particles only

• Bacteria only

• Microscopic particles and bacteria

In reverse osmosis, it is optional for pressure to be present in this process.

• True

• False

In the final stage of NEWater treatment, reverse osmosis process purify the water which includes removing undesirable contaminants including viruses.

• True

• False