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Date	November 2018	Marks available	3	Reference code	18N.3.HL.TZ0.10
Level	Higher level	Paper	Paper 3	Time zone	TZ0 / no time zone
Command term	List	Question number	10	Adapted from	N/A

Question

The diagram shows an overview of the Henriksdal wastewater treatment process in Stockholm, Sweden.

State a group of organisms that will be active in the fermenter labelled X.

[1]

a.

Deduce, with a reason, whether X is a continuous fermenter or a batch fermenter.

[1]

b.

Probes are used to monitor significant variables within the fermenter. List three significant variables that should be monitored in the fermenter.

[3]

c.

State the main component of biogas.

[1]

d.

Inside Y there are rotating paddles. Outline two reasons for these paddles being needed.

[2]

e.

Markscheme

bacteria
OR
archaeans
OR
methanogens ✔

Accept a named bacterium

a.

continuous because there is a constant input of raw materials ✔

b.

a. pH/acidity/alkalinity ✔

b. foam ✔

c. metabolites ✔

d. substrate ✔

e. oxygen ✔

f. carbon dioxide ✔

g. temperature ✔

h. pressure ✔

Accept other valid condition

c.

methane ✔

d.

a. mixing substrate to increase contact with bacteria
OR
preventing sedimentation ✔

b. avoids formation of biofilms ✔

c. aeration for aerobic bacteria ✔

e.

Examiners report

[N/A]

a.

[N/A]

b.

[N/A]

c.

[N/A]

d.

[N/A]

e.

Syllabus sections

Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics) » B.1 Microbiology: organisms in industry

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