response of algae to sewer misconnections dave chandler, prof. david lerner, prof. philip warren,...
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Response of algae to sewer misconnections
Dave Chandler, Prof. David Lerner, Prof. Philip Warren, Prof. Lorraine [email protected]@diatomdave
18/04/23 © The University of Sheffield
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Why are algae important
• Primary producers• Oxygen provision• Carbon fixing• Nutrient retention• Metal retention
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Representative substances in misconnection effluent
UKWIR (2012)
36%
36%
7%
7%
7%6% 2%
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Representative substances in misconnection effluent
UKWIR (2012)
• Majority discharge soaps/detergents
36%
36%
7%
7%
7%6% 2%
18/04/23 © The University of Sheffield
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Representative substances in misconnection effluent
UKWIR (2012)
• Majority discharge soaps/detergents
• Washing machines make up approx. 1/3 36%
36%
7%
7%
7%6% 2%
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Experimental design
18/04/23 © The University of Sheffield
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Experimental design• Collect algae from rivers
18/04/23 © The University of Sheffield
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Experimental design• Collect algae from rivers
• Grow algal communities on tiles
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Experimental design• Collect algae from rivers
• Grow algal communities on tiles
• Produce artificial washing machine effluents
18/04/23 © The University of Sheffield
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Experimental design• Collect algae from rivers
• Grow algal communities on tiles
• Produce artificial washing machine effluents
• Expose algal to effluents at different concentrations
Experimental concept
18/04/23 © The University of Sheffield
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Control0% effluent
A0.1% effluent
B1% effluent
C10% effluent
D50% effluent
Phosphorus containing detergent
Phosphorus free detergent
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Chlorophyll a results
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Chlorophyll a results
Ch
loro
ph
yll
a
con
cen
trati
on
(mg/c
m2)
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Chlorophyll a results
Ch
loro
ph
yll
a
con
cen
trati
on
(mg/c
m2)
18/04/23 © The University of Sheffield
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Chlorophyll a results
Ch
loro
ph
yll
a
con
cen
trati
on
(mg/c
m2)
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Conclusions
• Detergent pollution reduces algal abundance
• Different detergents produce similar responses
• Follow up work• Investigate changes in algal community structure
• Investigate impacts of misconnections in the field
• Expand to other groups of organisms
@diatomdave