Download Profit and Waste Presentation

BIOTECHNOLOGY
(b) Problems with profit and waste
W. McConnell 2004 Kinross High School
1.
What effect does disposal of untreated
sewage have on the oxygen level in the
water?
It lowers the oxygen levels.
W. McConnell 2004 Kinross High School
2.
Name 4 diseases that can be spread by
untreated sewage contaminating
drinking water.
• Typhoid
• Cholera
• Dysentery
• Food poisoning.
W. McConnell 2004 Kinross High School
3.
The removal of oxygen from rivers
results in anaerobic
……………… conditions.
W. McConnell 2004 Kinross High School
4.
In the sewage treatment works the
organic waste is broken down by the
action of …………
………………….… into
decay micro-organisms
less ……………
harmful to the
products that are ……
environment.
W. McConnell 2004 Kinross High School
5.
When sewage broken down by decay microorganisms is it under aerobic or anaerobic
conditions?
Aerobic conditions
W. McConnell 2004 Kinross High School
6.
In what 2 ways is extra oxygen
added to the sewage to provide
aerobic conditions?
•Compressed air is added
•Mechanical stirring
W. McConnell 2004 Kinross High School
7.
Why is it important that some sewage
bacteria respire anaerobically?
So that the sewage can be completely broken down.
Aerobic bacteria can only break down some of the waste
matter.
W. McConnell 2004 Kinross High School
8.
Why is a range of micro-organisms
essential for sewage breakdown?
Different micro-organisms feed
on different waste materials in
sewage.
W. McConnell 2004 Kinross High School
9.
Why do we upgrade waste?
To convert it into more
useful substances.
W. McConnell 2004 Kinross High School
10.
Give 2 examples of more useful
substances which are produced when
waste is upgraded.
•Increased levels of protein in the waste
•Increased energy content of the waste
W. McConnell 2004 Kinross High School
11.
Which gas is produced by fermenting
organic waste?
Methane / Biogas
W. McConnell 2004 Kinross High School
12.
Which type of fermentation fuel is
produced by fermentation of sugar cane?
Alcohol
W. McConnell 2004 Kinross High School
13.
What are the advantages of using
fermentation fuels rather than
fossil fuels?
•Harmless to the environment
•Easy to obtain
•Cheap to obtain
•Renewable
W. McConnell 2004 Kinross High School
14.
What careful lab techniques must
be followed to prevent cross
contamination by micro-organisms?
• Hands
- ?washed before and after the experiment.
• Benches
- ?washed down with disinfectant.
• Equipment -?sterilised then autoclaved after experiment.
W. McConnell 2004 Kinross High School
15.
What happens to the oxygen level
in rivers when untreated sewage is
added to it?
The oxygen level falls
W. McConnell 2004 Kinross High School
16.
Why does the oxygen level in a
river fall if untreated sewage is
added to it?
Bacteria feed on the raw
sewage and use up the oxygen
from the water.
W. McConnell 2004 Kinross High School
17.
What effect does sewage have on
the pH of water?
It raises the pH – ammonia
gas given off makes the water
alkaline.
W. McConnell 2004 Kinross High School
18.
When living tissue dies, what causes it
to decay?
The action of microbes feeding off the dead tissue
W. McConnell 2004 Kinross High School
19.
During the decay process which two
elements are recycled?
•Carbon
•Nitrogen
W. McConnell 2004 Kinross High School
20.
Why can alcohol and methane, both
products of fermentation be described
as fuels?
Because they both burn to
produce heat
W. McConnell 2004 Kinross High School
This is the end of the questions on
‘Problems with Profit and Waste’.
W. McConnell 2004 Kinross High School
This is the end of the questions on
‘Problems with Profit and Waste’.
W. McConnell 2004 Kinross High School
This is the end of the questions on
‘Problems with Profit and Waste’.
W. McConnell 2004 Kinross High School
This is the end of the questions on
‘Problems with Profit and Waste’.
W. McConnell 2004 Kinross High School
This is the end of the questions on
‘Problems with Profit and Waste’.
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W. McConnell 2004 Kinross High School