Waste Water Treatment Quiz

The first step of waste water treatment is _______________.

• Sedimentation

• Screening

• Anaerobic Digestion

• Aerobic Digestion

Anaerobic digestion produces ________ gas, which can be used for energy.

• Carbon dioxide

• Water vapour

• Methane

The second step of water treatment is sedimentation. What is the purpose of this step?

• Break down organic material using air.

• Separate the sludge and the less dense effluent

• Remove any large bit of materials

What is sludge?

• Solid sewage waste

• Treated sewage

• Solid AND liquid sewage waste

• Liquid sewage waste

What is effluent?

• Sewage liquid waste

• Treated sewage

• Sewage liquid AND solid waste

• Sewage solid waste

What does aerobic digestion mean?

• To break down organic matter in absence of oxygen

• To break down organic matter in presence of chlorine

• To break down organic matter in presence of ozone

• To break down organic matter in presence of oxygen

Where does the water go when it leaves your house?

• Potable water treatment plant

• Pure water treatment plant

• Sewage treatment plants

The second step in waste water treatment is

• Screening and grit removal

• Sedimentation – to produce sewage sludge and effluent

• Aerobic biological treatment of effluent

• Anaerobic digestion of sewage sludge

The anaerobic digestion of sewage water produces

• natural gas and crude oil

• fertilisers and crude oil

• biogas and fertiliser

• methane gas only

Once waste water has been treated, and chemical tests confirm it can be drink, where is it put?

• Into sewers

• Into artificial clouds

• Into rivers

• Into the ocean