Match the following types of pollutions with their examples

• Erosion from construction sites

• Pollution by inorganic chemicals

• Acid mine drainage

• Pollution by pathogens

• Nuclear plant discharge

• Pollution by sediments

• E.Coli

• Pollution by radioactive substances

• Fertiliser run-off

• Pollution by nurtients

Tags

NGSS.MS-ESS3-4

Reorder the following sewage treatment processes

• Secondary Treatment

• Tertiary Treatment

• Primary Treatment

The diagram shows a waste water treatment process. Select the correct process for each stage (i.e. what is removed):
​ ​ ​ (a)   : removes large debris such as plastics, rags and other solid materials.

​ (b)   : Removes small particles like sand, gravel and other inorganic materials.

​ (c)   : Introduces air into the sewage to encourage aerobic bacteria to break down organic matter.

​ (d)   : Settles out suspended solids, separating them from the liquid to form sludge.

​ (e)   : Reduces the water content of sludge, making it easier to handle and dispose of.

• Screening

• Grit removal

• Aeration

• Clarifier

• Solids De-watering

Answer explanation

The correct process for removing large debris such as plastics, rags, and other solid materials is Screening.

Tags

NGSS.MS-PS1-2

At what stage is harmful bacteria and pathogens inactivated.

Compare what happens to stormwater in a natural and in an urban environment

Answer explanation

In a natural environment, stormwater is absorbed by soil and vegetation, reducing runoff. In an urban environment, stormwater flows over impervious surfaces, leading to increased runoff and pollution.

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-4

List 3 different design features that can improve stormwater issues in urban areas

Answer explanation

1. Green roofs can absorb rainwater. 2. Permeable pavements allow water to seep through. 3. Rain gardens help filter and store stormwater.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-4

Label the correct zones of the artificial wetland

a

b

c

d

e

f

g

h

Macrophyte Zone

Outlet Zone

Cleansed water released

Large Debris removed

Inlet Zone

Nurtients removed

Sediment removed

Open Water Zone

Tags

NGSS.MS-ESS2-4

NGSS.MS-LS2-3