week 4 material

Question 1

What is a Contaminant?

Answer 1

a polluting or poisonous substance that

makes something impure

Question 2

What is a Pollutant?

Answer 2

a substance that pollutes something, especially water or the atmosphere

Question 3

What is a • Pollute?

Answer 3

contaminate (water, the air, etc.) with harmful or poisonous substances

Question 4

What are the different types of Contaminants?

Answer 4

• Organic: hydrocarbons
• Inorganic: metals
• Hybrids: organometallic

Question 5

What is Biomagnification?

Answer 5

species at higher trophic levels eat those at lower leading to higher concentrations of pollutants

Question 6

What are the pros and cons of the Activated sludge method?

Answer 6

\+Highly efficient & customisable
\+ Low cross-contamination
\+ Cheap to install
- Expensive to run
- Sludge disposal required
- Skilled supervision required

Question 7

What are the pros and cons of the Trickling filter method?

Answer 7

\+ Easy and cheap to build & run
\+ Minimal supervision required
- Less effective (why?)
- Can clog
- Low throughput
- Contamination & smell

Question 8

How are pathogens removed?

Answer 8

Filtration
• Sterilisation
• Chlorine/ozone